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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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