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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Petrakovskii G. A., Vasil'ev V. N., Sablina K. A.
Заглавие : Two-phase paramagnetic-ferromagnetic state of La0.7Pb0.3MnO3 single-crystal lanthanum manganite
Место публикации : Phys. Solid State: AMER INST PHYSICS, 2002. - Vol. 44, Is. 7. - P1350-1354. - ISSN 1063-7834, DOI 10.1134/1.1494635
Примечания : Cited References: 17
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Petrakovskii G. A., Volkov N. V., Vasil'ev V. N., Sablina K. A.
Заглавие : Magnetic resonance spectrum of a two-phase state in single crystals of La0.7Pb0.3MnO3 lanthanum manganite
Место публикации : JETP Letters. - 2000. - Vol. 71, Is. 4. - P.144-147. - ISSN 0021-3640, DOI 10.1134/1.568300
Примечания : Cited References: 10
Предметные 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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Vasil'ev V. N., Matveiko E. N.
Заглавие : Investigation of the effect of uniaxial pressure on antiferromagnetic resonance in KFe11Ol7 crystals
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1998. - Vol. 40, Is. 3. - P471-473. - ISSN 1063-7834, DOI 10.1134/1.1130311
Примечания : Cited References: 7
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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Patrin G. S., Vas'kovskii V. O., Svalov A. V., Eremin E. V., Panova M. A., Vasil'ev V. N.
Заглавие : Magnetic resonance in multilayer Gd/Si/Co magnetic films
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 102, Is. 1. - P131-136. - ISSN 1063-7761, DOI 10.1134/S1063776106010158
Примечания : Cited References: 9
Предметные рубрики: FIELD
Ключевые слова (''Своб.индексиров.''): 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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