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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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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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Vasil'ev, V. N.
Investigation of the effect of uniaxial pressure on antiferromagnetic resonance in KFe11Ol7 crystals / V. N. Vasil'ev, E. N. Matveiko // Phys. Solid State. - 1998. - Vol. 40, Is. 3. - P. 471-473, DOI 10.1134/1.1130311. - Cited References: 7 . - ISSN 1063-7834

РУБ Physics, Condensed Matter

Аннотация: The deformation dependence of the resonance field in KFe11O17 single crystals was investigated by the AFMR method The measurements were performed at T = 77 K and nu = 47.52 GHz for two orientations of the external pressure, The experimental data are discussed in terms of a model of a very simple easy-place antiferromagnet taking account of the elastic and magnetoelastic contributions to the thermodynamic potential The magnetostriction, magnetoelastic, and elastic contants are calculated and the results are lambda = 1.94 x 10(-5), B-1 = 2.75 X 10(8) erg/cm(3), and C-11-C-12 = 1.42 X 10(13) erg/cm(3), respectively. The values of these constants imply that the origin of the initial gap in the AFMR spectrum is not of magnetoelastic origin. (C) 1998 American Institute of Physics. [S1063-7834(98)02403-4].

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

Доп.точки доступа:
Matveiko, E. N.
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Magnetic resonance in multilayer Gd/Si/Co magnetic films / G. S. Patrin [et al.] // J. Exp. Theor. Phys. - 2006. - Vol. 102, Is. 1. - P. 131-136, DOI 10.1134/S1063776106010158. - Cited References: 9 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
FIELD
Кл.слова (ненормированные):
Magnetic properties -- Molecular dynamics -- Paramagnetic resonance -- Thin films -- Exchange parameters -- Gyromagnetic ratios -- Interlayer coupling -- Magnetic dynamics -- Resonance
Аннотация: The magnetic properties of multilayer Gd/Si/Co magnetic films are experimentally studied by electron magnetic resonance and analyzed theoretically. The introduction of a semiconductor silicon interlayer is found to substantially affect the magnetic interlayer coupling and the magnetic dynamics of the system. The interlayer coupling is shown to be ferromagnetic for the (Gd/Si)(n) films and to be antiferromagnetic for the (Gd/Si/Co/Si)(n) films. The temperature dependences of the exchange parameters and the gyromagnetic ratios are determined. Possible mechanisms responsible for the formation of the interlayer coupling are discussed.

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Держатели документа:
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Ural State Univ, Ekaterinburg 620083, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Ural State University, pr. Lenina 51, Yekaterinburg, 620083, Russian Federation
Krasnoyarsk State University, pr. Svobodnyi 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Patrin, G. S.; Патрин, Геннадий Семёнович; Vas'kovskii, V. O.; Svalov, A. V.; Eremin, E. V.; Еремин, Евгений Владимирович; Panova, M. A.; Vasil'ev, V. N.
}
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