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Linear and circular magnetic dichroism in thin films of lanthanum manganite [Текст] / Yu. E. Greben'kova [и др.] // V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism : abstracts. - Vladivostok : FEFU, 2013. - P. 324 . - ISBN 978-5-7444-3124-2

Доп.точки доступа:
Greben'kova, Yu.E.; Гребенькова, Юлия Эрнестовна; Sokolov, A. E.; Соколов, Алексей Эдуардович; Edel'man, I. S.; Эдельман, Ирина Самсоновна; Andreev, N. V.; Андреев Н. В.; Chichkov, V. I.; Чичков В. И.; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)
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Magneto-optical spectroscopy of manganite thin film : Abstract / Yu. E. Greben'kova [et al.]. ; Taurida National V. I. Vernadsky University // Functional materials : Abstracts / ed. V. N. Berzhansky. - Simferopol, 2013. - P. 186 . - ISBN 978-966-491-465-6

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Доп.точки доступа:
Berzhansky, V. N. \ed.\; Бержанский, Владимир Наумович; Greben'kova, Yu.E.; Гребенькова, Юлия Эрнестовна; Sokolov, A. E.; Соколов, Алексей Эдуардович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Andreev, N. V.; Андреев Н.В.; Chichkov, V. I.; Чичков В.И.; Taurida National V. I. Vernadsky University; "Functional Materials", International Conference(2013 ; 29 Sept.-5 Oct. ; Partenit, Yalta; Ukraine Crimea)
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Response of a manganite-based magnetic tunnel structure to microwave radiation / N. V. Volkov [et al.] // Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P. 125-128, DOI 10.4028/www.scientific.net/SSP.190.125 . - ISBN 978. - ISBN 9783037854365
Кл.слова (ненормированные):
Magnetic tunnel structure -- Microwave detection effect -- Spintronics -- Current flowing -- Current-in-plane geometry -- Magnetic tunnels -- Magnetization dynamics -- Microwave detection -- Non-Linearity -- Rectification effects -- Spin-polarized currents -- Voltage signals -- Magnetic materials -- Magnetoelectronics -- Manganese oxide -- Microwaves -- Magnetism
Аннотация: We demonstrate that a magnetic tunnel structure irradiated by microwaves can generate a significant voltage signal due to the rectification effect. The measurements were carried out using current-in-plane geometry with a current flowing parallel to the interfaces in the structure. A value of the microwave-induced voltage strongly depends on a bias current and can be driven by a magnetic field. The rectification effect is discussed both in "Classical" terms of nonlinearity of the current-voltage characteristic and using a mechanism that involves the interplay between the spinpolarized current and magnetization dynamics in the magnetic tunnel structure. В© (2012) Trans Tech Publications.

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Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Eremin, E. V.; Еремин, Евгений Владимирович; Patrin, G. S.; Патрин, Геннадий Семёнович; Kim, P. D.; Ким, Петр Дементьевич; Lee, C. G.; Moscow International Symposium on Magnetism(5 ; 2011 ; Aug. ; 21-25 ; Moscow)
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Formation of ferromagnetic germanides by solid-state reactions in 20Ge/80Mn films / V. G. Myagkov [et al.] // Thin Solid Films. - 2014. - Vol. 552. - P. 86-91, DOI 10.1016/j.tsf.2013.12.029. - Cited References: 53 . - ISSN 0040-6090

РУБ Materials Science, Multidisciplinary + Materials Science, Coatings & Films + Physics, Applied + Physics, Condensed Matter
Рубрики:
PHASE-FORMATION
   MAGNETIC-PROPERTIES
   Mn5Ge3 FILMS
   X-RAY
   Ge(111)
   TRANSFORMATIONS
   DIFFUSION
   SPECTRA
   SYSTEM
   LAYERS
Кл.слова (ненормированные):
Manganite-germanium -- Solid state reaction -- First phase -- Mn5Ge3 alloy -- Carbon impurity -- Oxygen impurity -- Annealing -- Magnetic anisotropy
Аннотация: Solid state reactions between Ge and Mn films are systematically examined using X-ray diffraction, photoelectron spectroscopy, and magnetic and electrical measurements. The films have a nominal atomic ratio Ge:Mn = 20:80 and are investigated at temperatures from 50 to 500 °C. It is established that after annealing at ~ 120°C, the ferromagnetic Mn5Ge3 phase is the first phase to form at the 20Ge/80Mn interface. As the annealing temperature increases to 300°C, the weak magnetic Mn5Ge 2 + Mn3Ge phases simultaneously begin to grow and they become dominant at 400°C. Increasing the annealing temperature to 500°C leads to the formation of the ferromagnetic phase with a Curie temperature TC ~ 350-360 K and magnetization 14-25 kA/m at room temperature. The X-ray diffraction study of the samples shows the reflections from the Mn 5Ge3 phase, and the photoelectron spectra contain the oxygen and carbon peaks. The homogeneous distribution of oxygen and carbon over the sample thickness suggests that the increased Curie temperature and magnetization are related to the migration of C and O atoms into the Mn 5Ge3 lattice and the formation of the Nowotny phase Mn5Ge3CxOy. The initiation temperature (~ 120 C) is the same in the Mn5Ge3 phase with the solid-state reactions in the Ge/Mn films as well as in the phase separation in the GexMn1 - x diluted semiconductors. Thus, we conclude that the synthesis of the Mn5Ge3 phase is the moving force for the spinodal decomposition of the GexMn 1 - x diluted semiconductors.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660049, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Myagkov, V. G.; Мягков, Виктор Григорьевич; Zhigalov, V. S.; Жигалов, Виктор Степанович; Matsynin, A. A.; Мацынин, Алексей Александрович; Bykova, L. E.; Быкова, Людмила Евгеньевна; Mikhlin, Y. L.; Bondarenko, G. N.; Бондаренко, Галина Николаевна; Patrin, G. S.; Патрин, Геннадий Семёнович; Yurkin, G. Yu.; Юркин, Глеб Юрьевич
}
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Response of a manganite-based magnetic tunnel structure to microwave radiation / N. V. Volkov [et al.] // J. Phys. D. - 2012. - Vol. 45, Is. 25. - Ст. 255301, DOI 10.1088/0022-3727/45/25/255301. - Cited References: 20. - This study was supported by the Russian Foundation for Basic Research, project no 11-02-00367-a; the Presidium of the Russian Academy of Sciences, program Fundamentals for Basic Research of Nanotechnology and Nanomaterials, project no 21.1; the Division of Physical Sciences of the Russian Academy of Sciences, program Spin-Dependent Effects in Solids and Spintronics, project no 2.4.4.1; the Siberian Branch of the Russian Academy of Sciences, integration projects nos 5 and 134; and the Federal target program Scientific and Pedagogical Personnel of Innovative Russia (State contract no NK-556P_15). . - ISSN 0022-3727

РУБ Physics, Applied
Рубрики:
IDENTICAL METALS
   JUNCTIONS
   RECTIFICATION
   SPINTRONICS
   MECHANISM
Аннотация: We demonstrate that a magnetic tunnel structure irradiated by microwaves can generate a typical voltage signal due to the rectification effect. We performed measurements in current-in-plane geometry when a current flows parallel to the interfaces in the structure. The value of the microwave-induced voltage strongly depends on the bias current and can be driven by a magnetic field. The rectification effect is discussed both in classical terms of nonlinearity of the current-voltage characteristics and within the mechanism involving the interplay between the spin-polarized current and the magnetization dynamics in the magnetic tunnel structure.

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Держатели документа:
[Volkov, N. V.
Rautskiy, M. V.
Eremin, E. V.
Patrin, G. S.
Kim, P. D.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Volkov, N. V.
Eremin, E. V.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Patrin, G. S.] Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk 660041, Russia
[Lee, C. G.] Changwon Natl Univ, Sch Nano & Adv Mat Engn, Chang Won 641773, Gyeongnam, South Korea

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Rautskiy, M. V.; Рауцкий, Михаил Владимирович; Eremin, E. V.; Еремин, Евгений Владимирович; Patrin, G. S.; Патрин, Геннадий Семёнович; Kim, P. D.; Ким, Петр Дементьевич; Lee, C. G.
}
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Volkov, N. V.
Spintronics: manganite-based magnetic tunnel structures / N. V. Volkov // Phys. Usp. - 2012. - Vol. 55, Is. 3. - P. 250-269, DOI 10.3367/UFNe.0182.201203b.0263. - Cited References: 91. - This work was supported by the Russian Foundation for Basic Research (grant No. 11-02-00367-a); the program of the Presidium of the RAS, Fundamental Research on Nanotechnologies and Nanomaterials (grant No. 21.1); the program of the Department of Physical Sciences of the RAS "Spin Phenomena in Solid Nanostructures and Spintronics" (grant No. 2.4.4.1); integration projects of the Siberian Branch, RAS, Nos 5 and 134; and the Federal Special Purpose Program "Scientific and Pedagogical Personnel of Innovative Russia" (state contract No. NK-556P_15). . - ISSN 1063-7869

РУБ Physics, Multidisciplinary
Рубрики:
HIGH-FREQUENCY RECTIFICATION
   THIN INSULATING FILM
   COLOSSAL MAGNETORESISTANCE
   GIANT MAGNETORESISTANCE
   ELECTRONIC-STRUCTURE
   SANDWICH STRUCTURES
   SPIN POLARIZATION
   IDENTICAL METALS
   PHASE-SEPARATION
   ROOM-TEMPERATURE
Аннотация: A topical and highly promising aspect of the field of spintronics is the physics involved in the flow of a spin-polarized current through magnetic tunnel structures. This review focuses on manganite-based structures, which are appealing for their high Curie temperature, highly spin-polarized conduction electrons, high chemical stability, and well-developed fabrication technology. Particular emphasis is placed on some novel approaches to studying the tunnel structures, including the use of planar geometry and the application of combined external factors (microwave and optical radiation) to investigate spin-polarized transport.

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Публикация на русском языке

Доп.точки доступа:
Волков, Никита Валентинович
}
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Magnetization dynamics and electron transport in the La0.7Sr0.3MnO3/Y3Fe5O12 hybrid structures / N. V. Volkov [et al.] // Solid State Phenom. : Selected, peer reviewed papers. - 2014. - Vol. 215: Trends in Magnetism: Nanomagnetism (EASTMAG-2013). - P. 368-371, DOI 10.4028/www.scientific.net/SSP.215.368. - Cited References: 6 . - ISSN 978-30383. - ISSN 1662-9779
Кл.слова (ненормированные):
Hybrid structure -- Manganite -- Spin pumping
Аннотация: We present the results of investigations of the spin-polarized current and spin dynamics in the hybrid structures ferrimagnetic insulator/ferromagnetic metal subjected to microwave radiation. We studied the La0.7Sr0.3MnO3/Y3Fe5O12 bilayer films on the Gd3Ga5O12 substrate. It was experimentally established that under the action of spin pumping the resistance of the La0.7Sr0.3MnO3 film changes. The value of ?R is maximum in the sample with a La0.7Sr0.3MnO3 layer thickness of 10 nm and sharply drops as the manganite film thickness is increased. The resistance decreases in the paramagnetic region and grows in the ferromagnetic region at temperatures below the metal-insulator transition point. The variation in the resistance of the manganite film can be attributed to the correlation of the spin dynamics and transport properties of conduction electrons in the structure. © (2014) Trans Tech Publications, Switzerland.

Доп.точки доступа:
Ovchinnikov, S. G. \ed.\; Овчинников, Сергей Геннадьевич; Samardak, A. \ed.\; Volkov, N. V.; Волков, Никита Валентинович; Smolyakov, D. A.; Смоляков, Дмитрий Александрович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Chichkov, V. I.; Чичков В. И.; Mukovskii, Y. M.; Муковский Я. М.; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; sept. ; 15-21 ; Vladivostok)
}
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Bondarev, I. A.
Transport properties of the La0.75Ca0.25MnO3 manganite [Текст] / I. A. Bondarev, N. V. Volkov // RACIRI Summer School : Book of abstracts. - 2013. - P. 18

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Бондарев, Илья Александрович; RACIRI Summer School(17−25 August, 2013 ; Peterhof, Russia)
}
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    Visible circular and linear magnetic dichroism in manganite thin films / Yu. E. Samoshkina [et al.] // Circular and Linear Dichroism / ed. J. Wallace. - New York : Nova Science Publishers, 2015. - P. 131-158. - (Lasers and electro-optics research and technology). - Cited References: 45. - The work was supported partly by RFBR, grant № 14-02-01211 and Grant of President of Russian Federation No. NSh-2886.2014.2 . - ISBN 978-1-63483-762-0
   Перевод заглавия: Круговой и линейный дихроизм в тонких пленках манганитов в видимой области спектра
Аннотация: Evolution of the magneto-optical spectra of the La0.7Sr0.3MnO3, Pr0.6Sr0.4MnO3 and Pr0.8Sr0.2MnO3 manganite films with the change in the Sr concentration has been studied in the visible and near infrared range. Magnetic circular dichroism (MCD) and magnetic linear dichroism (MLD) have been chosen for investigation as these effects are higher informative comparing to the Faraday and Kerr effects. The Sr concentration increase in the samples leads to a sequential shift of the gravity centers of the magneto-optical bands to lower energies, to a strong increase of the effects magnitude in the range of 2.5-3.6 eV, and to the appearance of the additional bands in the spectra of the films with metallic conductivity. Experimental spectra have been decomposed to several Gaussian and Lorentz contours, and their intensity temperature dependences have been analyzed. For the films with metallic conductivity, the different character of the temperature dependences of the different bands intensity has been found. Basing on the characteristic dependence of the magneto-optical bands intensity on temperature, Sr concentration, and films conductivity type, electron transitions responsible for the MCD and MLD spectra formation have been identified.

Доп.точки доступа:
Wallace, Jasmin \ed.\; Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Sokolov, A. E.; Соколов, Алексей Эдуардович; Andreev, N. V.; Андреев Н. В.; Chichkov, V. I.; Чичков В. И.
}
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10.

    Особенности магнетосопротивления двухслойного монокристаллического манганита La1,4Sr1,6Mn2O7 / С. Е. Никитин [и др.] // Вестник НГУ. Физика. - 2015. - Т. 10, Вып. 1. - С. 63-66. - Библиогр.: 8 . - ISSN 1818-7994
   Перевод заглавия: Features of magnetoresistance in the bilayer single crystal manganite La1.4Sr1.6Mn2O
Кл.слова (ненормированные):
манганиты лантана -- положительное магнетосопротивление -- manganite -- positive magnetoresistance
Аннотация: Представлены результаты исследования магнетосопротивления на двухслойном монокристаллическом манганите лантана La1,4Sr1,6Mn2O7 при пропускании транспортного тока вдоль оси с ( j ‖ c ) и приложении внешнего магнитного поля H ‖ j и H ⊥ j. В монокристалле La1,4Sr1,6Mn2O7 в случае, когда H ⊥ j, помимо присущего всем замещенным манганитам лантана отрицательного магнетосопротивления в температурном диапазоне T < 60 K, обнаружен эффект положительного магнетосопротивления. Механизм возникновения данного эффекта принципиально отличается от эффекта колоссального магнетосопротивления, присущего всем манганитам лантана. Мы считаем, что появление положительного магнетосопротивления вызвано спин-зависимым туннелированием носителей между марганец-кислородными бислоями, при данной конфигурации «магнитное поле - ток», и может быть объяснено особенностями магнитной структуры данных составов.
We investigate magnetoresistance of single-crystal bilayer lanthanum manganite La1.4Sr1.6Mn2O7 at a transport current flowing along the crystal c axis and in external magnetic fields applied parallel to the crystal c axis or ab plane. It is demonstrated that the La1.4Sr1.6Mn2O7 manganite exhibits the positive magnetoresistance effect in the magnetic field applied in the ab plane of the sample at the temperatures T < 60 K. The mechanism of this effect is shown to be fundamentally different from the colossal magnetoresistance effect typical of lanthanum manganites. The positive magnetoresistance originates from spin-dependent tunneling of carriers between the manganese-oxygen bilayers and can be explained by features of the magnetic structure of the investigated compounds.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Никитин, Станислав Евгеньевич; Nikitin, S. E.; Попков, Сергей Иванович; Popkov, S. I.; Петров, Михаил Иванович; Petrov, M. I.; Терентьев, Константин Юрьевич; Terent'yev, K. Yu.; Семенов, Сергей Васильевич; Semenov, S. V.; Шайхутдинов, Кирилл Александрович; Shaikhutdinov, K. A.; Сибирский молодежный семинар по высокотемпературной сверхпроводимости и физике наноструктур – ОКНО 2014 (X ; 13 - 14 ноября 2014 г. ; Новосибирск)
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11.

Magnetoresistance of substituted lanthanum manganites La0.7Ca0.3MnO3 upon nonequilibrium overheating of carriers / K. A. Shaykhutdinov [et al.] // J. Appl. Phys. - 2011. - Vol. 109, Is. 8. - Ст. 83711, DOI 10.1063/1.3573666. - Cited References: 15. - This study was partially supported by the Russian Foundation for Basic Research, project no. 08-02-00259a, and the Lavrent'ev's Competition of Young Scientists of the Siberian Branch of the RAS, project no. 12. . - ISSN 0021-8979

РУБ Physics, Applied

Кл.слова (ненормированные):
Field dependence -- Lanthanum manganites -- Low thermal conductivity -- Manganite materials -- Negative differential resistivity -- Non equilibrium -- Non-Linearity -- Nonequilibrium heating -- Polycrystalline -- Positive magnetoresistance -- Transport currents -- Electric resistance -- Electron gas -- Heating -- Lanthanum -- Lanthanum alloys -- Magnetic fields -- Magnetoelectronics -- Magnetoresistance -- Manganese oxide -- Manganites -- Thermal conductivity -- Current voltage characteristics
Аннотация: Current-voltage characteristics of the polycrystalline substituted lanthanum manganite La0.7Ca0.3MnO3 were experimentally studied at T - 77.4 K in magnetic fields up to 13 kOe. In these characteristics, a portion of negative differential resistivity was observed above a certain threshold value of critical current density j caused, in our opinion, by nonequilibrium heating of the electron gas due to low thermal conductivity of the manganite material. Because of the nonlinearity of the current-voltage characteristics, the field dependences of resistivity rho( H) appear extremely sensitive to the value of a transport current. In this case, the rho( H) dependences reveal both ordinary negative and positive magnetoresistance. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3573666]

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Держатели документа:
[Shaykhutdinov, K. A.
Semenov, S. V.
Popkov, S. I.
Balaev, D. A.
Bykov, A. A.
Dubrovskiy, A. A.
Petrov, M. I.
Volkov, N. V.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Shaykhutdinov, K. A.
Popkov, S. I.
Balaev, D. A.
Dubrovskiy, A. A.
Volkov, N. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Semenov, S. V.; Семенов, Сергей Васильевич; Popkov, S. I.; Попков, Сергей Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Bykov, A. A.; Быков, Алексей Анатольевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Petrov, M. I.; Петров, Михаил Иванович; Volkov, N. V.; Волков, Никита Валентинович
}
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12.

The magnetic-field-driven effect of microwave detection in a manganite granular system / N. V. Volkov [et al.] // J. Phys. D. - 2008. - Vol. 41, Is. 1. - Ст. 15004, DOI 10.1088/0022-3727/41/1/015004. - Cited References: 24 . - ISSN 0022-3727

РУБ Physics, Applied
Рубрики:
IDENTICAL METALS
   TUNNEL-JUNCTIONS
   MAGNETORESISTANCE
   RECTIFICATION
   SPINTRONICS
   TEMPERATURE
   PEROVSKITES
Кл.слова (ненормированные):
Bias currents -- Curie temperature -- Electric power generation -- Granular materials -- Magnetic field effects -- Microwave irradiation -- Voltage measurement -- Direct current voltage -- Magnetic tunnel junctions -- Metal insulator metal junctions -- Nonmagnetic metals -- Manganites
Аннотация: We demonstrate the microwave detection effect in a granular La0.7Ca0.3MnO3 sample. Dc voltage generated by the sample in response to microwave irradiation below the Curie temperature is found to be dependent on the applied magnetic field. The magnetic field dependence of the dc voltage has a broad peak resembling an absorption line. The detection effect depends substantially on the magnetic history of the sample; however, identical measurement conditions provide reproducibility of the experimental results. The detected dc voltage increases linearly with microwave power and strongly depends on a bias current through the sample. According to the results of systematic measurements, there exist two contributions to a value of the detected output signal. The first is magneto-independent; it can be explained in the framework of a mechanism used traditionally for description of the rectification effect in metal-insulator-metal junctions with nonmagnetic metals. The other is magneto-dependent; it originates from the interplay between the spin-dependent current through magnetic tunnel junctions and spin dynamics of the grains, which form these junctions in the sample.

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Держатели документа:
[Volkov, N. V.
Eremin, E. V.
Shaykhutdinov, K. A.
Tsikalov, V. S.
Petrov, M. I.
Balaev, D. A.
Semenov, S. V.] Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
[Volkov, N. V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Shaykhutdinov, K. A.; Шайхутдинов, Кирилл Александрович; Tsikalov, V. S.; Petrov, M. I.; Петров, Михаил Иванович; Balaev, D. A.; Балаев, Дмитрий Александрович; Semenov, S. V.; Семенов, Сергей Васильевич
}
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13.

Features of the magnetic properties of La0.7Sr0.3MnO3 manganite films obtained by an extraction-pyrolysis method / G. S. Patrin [et al.] // Tech. Phys. Lett. - 2007. - Vol. 33, Is. 4. - P. 330-332, DOI 10.1134/S1063785007040177. - Cited References: 12 . - ISSN 1063-7850

РУБ Physics, Applied
Рубрики:
PHASE-SEPARATION
MAGNETORESISTANCE
Аннотация: We have experimentally studied the magnetic properties of manganite films obtained for first time using an extraction-pyrolysis technique. It is established that the characteristics of samples significantly depend on the conditions of final annealing. The annealing at temperatures T-a 970 K is accompanied by strong thermomagmetic effects. and the resulting films possess properties similar to those of spin glasses. When the annealig temperature is increased to T-a = 1020 K, the films exhibit magnetic properties typical of ferromagnetic systems.

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
Krasnoyarsk State Polytech Univ, Krasnoyarsk 660062, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Patrin, G. S.; Патрин, Геннадий Семёнович; Polyakova, K. P.; Полякова, Клавдия Павловна; Patrusheva, T. N.; Патрушева, Тамара Николаевна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
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14.

Two-phase paramagnetic-ferromagnetic state of La0.7Pb0.3MnO3 single-crystal lanthanum manganite / N. V. Volkov [et al.] // Phys. Solid State. - 2002. - Vol. 44, Is. 7. - P. 1350-1354, DOI 10.1134/1.1494635. - Cited References: 17 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
COLOSSAL MAGNETORESISTANCE
   MAGNETIC-RESONANCE
   DOPED MANGANITES
   LA1-XCAXMNO3
   SEPARATION
   TRANSITION
   RELAXATION
   EPR
Аннотация: Two phases, paramagnetic and ferromagnetic, were shown by the magnetic resonance method to coexist below the temperature T-C in La0.7Pb0.3MnO3 single crystals exhibiting colossal magnetoresistance. The magnetic resonance spectra were studied in the frequency range 10-78 GHz. The specific features in the behavior of the spectral parameters were observed to be the strongest at the temperatures corresponding to the maximum magnetoresistance in the crystals. The concentration ratios of the paramagnetic and ferromagnetic phases in the samples were found to be sensitive to variations in temperature and external magnetic field. This behavior suggests realization of the electronic phase separation mechanism in the system under study. (C) 2002 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Vasil'ev, V. N.; Sablina, K. A.; Саблина, Клара Александровна
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15.

Magnetic resonance spectrum of a two-phase state in single crystals of La0.7Pb0.3MnO3 lanthanum manganite / G. A. Petrakovskii [et al.] // JETP Letters. - 2000. - Vol. 71, Is. 4. - P. 144-147, DOI 10.1134/1.568300. - Cited References: 10 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
FERROMAGNETIC-RESONANCE
LA1-XCAXMNO3
SEPARATION
Аннотация: Two absorption lines are observed over a wide temperature range below T-c in the magnetic resonance spectrum of an La0.7Pb0.3MnO3 single crystal. These lines correspond to two magnetic phases in the sample. The frequency-field dependence of spectra obtained in the range of microwave radiation frequencies 10-77 GHz allows these phases to be interpreted as ferromagnetic and paramagnetic phases. The phase volume ratio depends on the temperature and the magnitude of the external magnetic field. Features in the temperature behavior of parameters of the magnetic absorption line are observed in the region of the highest magnetic resistance of the sample. The results are interpreted within the mechanism of electronic phase separation. (C) 2000 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Petrakovskii, G. A.; Петраковский, Герман Антонович; Volkov, N. V.; Волков, Никита Валентинович; Vasil'ev, V. N.; Sablina, K. A.; Саблина, Клара Александровна
}
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16.

Optically driven conductivity and magnetoresistance in a manganite-based tunnel structure / N. V. Volkov [et al.] // J. Phys. D. - 2009. - Vol. 42, Is. 20. - Ст. 205009, DOI 10.1088/0022-3727/42/20/205009. - Cited References: 13. - This study was supported by the Russian Foundation for Basic Research (Projects Nos 08-02-00259-a and 08-02-00397-a) and the Division of Physical Sciences of the RAS, Programme 'Spin-dependent Effects in Solids and Spintronics' (Project No 2.4.2 of the Siberian Branch of the RAS). . - ISSN 0022-3727

РУБ Physics, Applied
Рубрики:
JUNCTIONS
Кл.слова (ненормированные):
Conducting layers -- Current-in-plane geometry -- Dielectric layer -- Electron hole pairs -- Interband absorption -- Magnetic tunnel junction -- Magnetic tunnels -- Multilayer structures -- Optical radiations -- Photoinduced change -- Potential barriers -- Radiation power density -- Threshold characters -- Tunnel structures -- Electric resistance -- Lanthanum -- Light -- Magnetic field effects -- Magnetoelectronics -- Magnetoresistance -- Manganese compounds -- Oxide minerals -- Photovoltaic effects -- Semiconductor junctions -- Transport properties -- Vehicular tunnels -- Wind tunnels -- Tunnel junctions
Аннотация: In the multilayer structure, La(0.7)Sr(0.3)MnO(3)/depleted manganite layer/MnSi, the photovoltaic effect has been discovered. The depleted manganite layer in the structure is dielectric and serves as a potential barrier between the ferromagnetic conducting La(0.7)Sr(0.3)MnO(3) and MnSi layers by the formation of a magnetic tunnel junction. The photoinduced changes in the transport properties of the magnetic tunnel structure have been observed in the current-in-plane geometry. The changes are reversible and saturate at radiation power densities over 30 mW cm(-2). The photovoltaic effect has a threshold character: it reveals only at h nu > 1.17 eV. Most likely, the effect of optical radiation is related to the formation of electron-hole pairs due to interband absorption of light in the dielectric layer. A photocurrent through the tunnel junctions separating the conducting layers causes a redistribution of the current channels between the conducting layers, which influences the conductivity and the magnetoresistance of the structure.

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Держатели документа:
[Volkov, N. V.
Kim, P. D.
Eremin, E. V.
Patrin, G. S.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Volkov, N. V.
Patrin, G. S.] Siberian Fed Univ, Inst Engn Phys, Krasnoyarsk 660041, Russia
[Lee, C. G.] Changwon Natl Univ, Sch Nano & Adv Mat Engn, Chang Won 641773, Gyeongnam, South Korea
[Eremin, E. V.] Siberian State Aerosp Univ, Inst Space Technol, Krasnoyarsk 660014, Russia
ИФ СО РАН
Kirensky Institute of Physics, Russian Academy of Science, Siberian Branch, Krasnoyarsk 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Changwon National University, School of Nano and Advanced Materials Engineering, Gyeongnam 641-773, Changwon, South Korea
Institute of Space Technology, Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Lee, C. G.; Kim, P. D.; Ким, Пётр Дементьевич; Eremin, E. V.; Еремин, Евгений Владимирович; Patrin, G. S.; Патрин, Геннадий Семёнович; Russian Foundation for Basic Research [08-02-00259-a, 08-02-00397-a]; Division of Physical Sciences of the RAS; [2.4.2]
}
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17.

Current-driven channel switching and colossal positive magnetoresistance in the manganite-based structure / N. V. Volkov [et al.] // J. Phys. D. - 2009. - Vol. 42, Is. 6. - Ст. 65005, DOI 10.1088/0022-3727/42/6/065005. - Cited References: 20. - This study was supported by the RFBR, Projects No 08-02-00259-a and 08-02-00397-a, the KRSF-RFBR 'Enisey-2007', Project No 07-02-96801-a and the Division of Physical Sciences of RAS, Program 'Spin-dependent Effects in Solids and Spintronics' (Project No 2.4.2 of SB RAS). . - ISSN 0022-3727

РУБ Physics, Applied

Кл.слова (ненормированные):
Colossal magnetoresistance -- Electric resistance -- Electronic structure -- Magnetic field effects -- Magnetoelectronics -- Manganese -- Manganites -- Oxide minerals -- Schottky barrier diodes -- Semiconductor junctions -- Silicides -- Tunnel junctions -- Tunnels -- Bottom layers -- Channel switching -- Conducting channels -- Conducting layers -- Current-driven -- Current-in-plane geometries -- Depletion layers -- Ferromagnetic state -- Layered structures -- Low-resistance contacts -- Magnetic tunnel junctions -- Magneto-transport properties -- Manganese silicides -- Manganite films -- New mechanisms -- Positive magnetoresistances -- Positive MR -- Potential barriers -- Spin-polarized -- Tunnel structures -- Voltage-current characteristics -- Current voltage characteristics
Аннотация: The transport and magnetotransport properties of a newly fabricated tunnel structure manganite/depletion layer/manganese silicide have been studied in the current-in-plane (CIP) geometry. A manganite depletion layer in the structure forms a potential barrier sandwiched between two conducting layers, one of manganite and the other of manganese silicide. The voltage-current characteristics of the structure are nonlinear due to switching conducting channels from an upper manganite film to a bottom, more conductive MnSi layer with an increase in the current applied to the structure. Bias current assists tunnelling of a carrier across the depletion layer; thus, a low-resistance contact between the current-carrying electrodes and the bottom layer is established. Below 30 K, both conducting layers are in the ferromagnetic state (magnetic tunnel junction), which allows control of the resistance of the tunnel junction and, consequently, switching of the conducting channels by the magnetic field. This provides a fundamentally new mechanism of magnetoresistance (MR) implementation in the magnetic layered structure with CIP geometry. MR of the structure under study depends on the bias current and can reach values greater than 400% in a magnetic field lower than 1 kOe. A positive MR value is related to peculiarities of the spin-polarized electronic structures of manganites and manganese silicides.

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Держатели документа:
[Volkov, N. V.
Eremin, E. V.
Tsikalov, V. S.
Patrin, G. S.
Kim, P. D.] SB RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Volkov, N. V.
Patrin, G. S.] Siberian Fed Univ, Dept Phys, Krasnoyarsk 660041, Russia
[Seong-Cho, Yu
Kim, Dong-Hyun] Chungbuk Natl Univ, Dept Phys, Cheongju 361763, South Korea
[Chau, Nguyen] Natl Univ Hanoi, Ctr Mat Sci, Hanoi, Vietnam
ИФ СО РАН
Kirensky Institute of Physics, SB RAS, Krasnoyarsk 660036, Russian Federation
Department of Physics, Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Department of Physics, Chungbuk National University, Cheongju 361-763, South Korea
Center for Materials Science, National University of Hanoi, 334 Nguyen Trai, Hanoi, Viet Nam

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Tsikalov, V. S.; Patrin, G. S.; Патрин, Геннадий Семёнович; Kim, P. D.; Ким, Пётр Дементьевич; Seong-Cho, Y.; Kim, D. H.; Chau, N.; RFBR [08-02-00259-a, 08-02-00397-a]; KRSF-RFBR [07-02-96801-a]; Division of Physical Sciences of RAS; Program 'Spin-dependent Effects in Solids and Spintronics' [2.4.2]
}
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18.

La-Sr and Pr-Sr polycrystalline manganite films: correlation between magneto-optical and transport properties / Yu. E. Samoshkina [et al.] // VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016) : abstracts / ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk : KIP RAS SB, 2016. - Ст. P6.7. - P. 315. - The work was supported partly by the Russian Foundation for Basic Researches, Grants Nos. 14-02-01211 and 16-32-00209 . - ISBN 978-5-904603-06-9
Кл.слова (ненормированные):
hole-doped manganites -- thin films -- magnetic circular dichroism -- metal-insulator transition

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Sokolov, A. E.; Соколов, Алексей Эдуардович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Semenov, S. V.; Семёнов, Сергей Васильевич; Andreev, N. V.; Андреев Н. В.; Chichkov, V. I.; Чичков В.И.; Euro-Asian Symposium "Trends in MAGnetism"(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); "Trends in MAGnetism", Euro-Asian Symposium(6 ; 2016 ; Aug. ; 15-19 ; Krasnoyarsk); Институт физики им. Л.В. Киренского Сибирского отделения РАН

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19.

    Magnetic and XMCD studies of Pr1-xSrxMnO3 manganite films / Y. E. Samoshkina [et al.] // J. Magn. Magn. Mater. - 2017. - Vol. 428. - P. 43-49, DOI 10.1016/j.jmmm.2016.12.014. - Cited References: 52. - The work was supported by the Russian Foundation for Basic Research, Project no's. 14-02-01211, 16-32-00209 mol_a, and also the Grant of the President of the Russian Federation no. NSh- 7559.2016.2, and the Ministry of Education and Science of the Russian Federation, Project no. 1362. . - ISSN 0304-8853
   Перевод заглавия: Магнитное и XMCD изучение пленок манганита Pr1−xSrxMnO3
Кл.слова (ненормированные):
Hole-doped manganites -- Thin films -- Magnetic measurements -- Spin-glass behavior -- X-ray magnetic circular dichroism
Аннотация: Magnetic properties of the Pr0.8Sr0.2MnO3 and Pr0.6Sr0.4MnO3 polycrystalline films have been studied using temperature and magnetic field dependences of the static magnetization and X-ray magnetic circular dichroism (XMCD) spectroscopy. For the both compositions, the difference between the temperature dependences of magnetization obtained in the zero fields cooling (ZFC) and field cooling (FC) modes has been revealed. The ZFC curves demonstrate a pronounced maximum at temperature Tm. It is shown that the Tm value dependence on the magnetic field follows the Almeida-Thouless line typical for the classic spin glass, what allows us to assume the possible spin-glass behavior of the films. Effect of the disorder in a direction of the crystallites easy-axis on the difference between FC and ZFC curves has been discussed also. Magnetic field dependences of the sample magnetization are presented by the hysteresis loops with the shape changing upon temperature variation. This behavior has been attributed to the effect of crystallographic anisotropy and Pr ions. The spectra and magnetic field dependences of XMCD at the Pr L2- and Mn K-edges have been studied at 90 K. The magnetic field dependences of the XMCD at the Pr L2-edge had shown Van Vleck paramagnetism from Pr3+ ions. © 2016 Elsevier B.V.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Ural Federal University, Yekaterinburg, Russian Federation
European Synchrotron Radiation Facility (ESRF), BP 220, Grenoble, France
National University of Science and Technology “MISiS”, Moscow, Russian Federation

Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Stepanova, E. A.; Neznakhin, D. S.; Ollefs, K.; Andreev, N. V.; Chichkov, V. I.
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20.

    Features of the magneto-optical response in manganite films / Yu. E. Samoshkina [et al.] // Moscow International Symposium on Magnetism (MISM-2017) : 1-7 July 2017 : book of abstracts. - 2017. - Ст. 5PO-K3-2. - P. 1093
   Перевод заглавия: Особенности магнитооптического отклика в пленках манганита

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Доп.точки доступа:
Samoshkina, Yu. E.; Самошкина, Юлия Эрнестовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Maximova, O. A.; Максимова, Ольга Александровна; Andreev, N. V.; Андреев Н. В.; Chichkov, V. I.; Чичков В.И.; Moscow International Symposium on Magnetism(7 ; 2017 ; Jul. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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