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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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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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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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Synthesis and Magnetic Properties of Manganite Pr0.7Ca0.3MnO3 Films / Patrin G.S., Polyakova K.P., Patrusheva T.N., Velikanov D.A., N.V. Volkov, D.A. Balaev, K.G. Patrin, A.A. Klabukov [и др.] // Moscow Int. Symp. on Magnet. (MISM-2008) : June 20-25, 2008, Moscow : book of abstract. - 2008. - Ст. 24PO-7-51. - p. 666-667. - Библиогр.: 3

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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; Volkov, N. V.; Волков, Никита Валентинович; Balaev, D. A.; Балаев, Дмитрий Александрович; Patrin, K. G.; Патрин, Константин Геннадьевич; Klabukov, A.A.; Клабуков, Андрей Александрович; Moscow International Symposium on Magnetism(4 ; 2008 ; Jun. ; Moscow); Московский государственный университет им. М.В. Ломоносова; Российский фонд фундаментальных исследований
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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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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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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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Current channel switching in the manganite-based multilayer structure / N. Volkov, E. Eremin [et al.] // 18th International Conference on Magnetism (ICM-2009). - 2009. - Ст. Mo-A-5.1-03

Доп.точки доступа:
Volkov, N.; Eremin, E.; Patrin, G.; Kim, P.; Yu, Seong-Cho; Dong-Hyun, Kim; Nguyen, Chau; International Conference on Magnetism(18 ; 2009 ; July 26-31 ; Karlsruhe, Germany)
}
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Nonlinear charge transport in the manganite/semiconductor structure: effects of magnetic field and optical radiation / N. V. Volkov, E. V. Eremin [et al.] // Восьмой Международный уральский семинар "Радиационная физика металлов и сплавов" : тезисы докладов : 23 февр. - 1 марта 2009, Снежинск, Росиия / сост. М. Ю. Яхонтова. - 2009. - P. 63

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Доп.точки доступа:
Яхонтова, М.Ю. \сост.\; Volkov, N. V.; Волков, Никита Валентинович; Eremin, E. V.; Еремин, Евгений Владимирович; Tsikalov, V. S.; Цикалов, Виталий Сергеевич; Kim, P. D.; Ким, Пётр Дементьевич; Seong-Cho, Yu; Dong-Hyun, Kim; N., Chau; "Радиационная физика металлов и сплавов", Международный уральский семинар (8 ; 2009 ; февр.-март ; Снежинск, Россия)
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10.

Magnetoresistance hysteresis in a polycrystalline (La0.5Eu0.5)0.7Pb0.3MnO3 manganite at low temperatures / S. V. Semenov, K. A. Shaykhutdinov [et al.] // 18th International Conference on Magnetism (ICM-2009). - 2009. - Ст. Mo-A-5.1-03

Доп.точки доступа:
Semenov, S.V.; Shaykhutdinov, K.A.; Popkov, S.I.; Balaev, A.D.; Dubrovskiy, A.A.; Sablina, K.A.; Volkov, N.V.; International Conference on Magnetism(18 ; 2009 ; July 26-31 ; Karlsruhe, Germany)
}
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