Synthesis and Magnetic Properties of [(CoP)soft/NiP/(CoP)hard/NiP]n Films

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.Magnetic interactions in the Co-Ni-P multilayers consisting of alternating magnetically soft and magnetically hard layers are experimentally investigated. The variation in the shape of magnetization loop at the conjugation of magnetically soft and magnetically hard layers and the saturation field oscillations with varying number of layer pairs are established. It is demonstrated that insertion of a nonmagnetic spacer significantly affects magnetization reversal in the structure. It is concluded that in studying the interlayer coupling it is necessary to take into account the biquadratic interaction. В работе представлены результаты экспериментальных исследований магнитных взаимодействий многослойных пленок в системе Co-Ni-P, когда один из слоев является магнитомягким, а другой магнитожестким. Обнаружены изменение формы петли намагничивания при сопряжении магнитомягкого и магнитожесткого слоев, и осцилляция поля насыщения в зависимости от числа пар слоев. Введение немагнитной прослойки существенно изменяет процесс перемагничивания структуры. Делается вывод о необходимости учета биквадратичного взаимодействия при рассмотрении межслоевых взаимодействий

Synthesis and Magnetic Properties of [(CoP)soft/NiP/(CoP)hard/NiP]n Films

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.Magnetic interactions in the Co-Ni-P multilayers consisting of alternating magnetically soft and magnetically hard layers are experimentally investigated. The variation in the shape of magnetization loop at the conjugation of magnetically soft and magnetically hard layers and the saturation field oscillations with varying number of layer pairs are established. It is demonstrated that insertion of a nonmagnetic spacer significantly affects magnetization reversal in the structure. It is concluded that in studying the interlayer coupling it is necessary to take into account the biquadratic interaction. В работе представлены результаты экспериментальных исследований магнитных взаимодействий многослойных пленок в системе Co-Ni-P, когда один из слоев является магнитомягким, а другой магнитожестким. Обнаружены изменение формы петли намагничивания при сопряжении магнитомягкого и магнитожесткого слоев, и осцилляция поля насыщения в зависимости от числа пар слоев. Введение немагнитной прослойки существенно изменяет процесс перемагничивания структуры. Делается вывод о необходимости учета биквадратичного взаимодействия при рассмотрении межслоевых взаимодействий

Magnetic properties of Fe-Bi films

In the paper the results of experimental studies of film structures in the Fe-Bi system are presented. By the method of electron magnetic resonance, it is shown that for bilayer structures the magnetic state depends on the order of deposition of the magnetic and non-magnetic layers. In the three-layer structures, the effect of exchange bias was found, the magnitude of that depends on the thickness of the bismuth layer. © Published under licence by IOP Publishing Ltd

Probing the Phase Separation in the Doped Manganites by the Magnetic Resonance Methods

Here we present magnetic resonance study which confirms an existence of a phase separation picture in Eu$\text{}_{0.7}$Pb$\text{}_{0.3}$MnO$\text{}_{3}$ single crystals. The measurements were performed with a standard technique and with using unconventional schemes of the magnetic resonance method. The inhomogeneous paramagnetic-ferromagnetic state, which is sensitive to a magnetic field, takes place in 0.65T$\text{}_{c}$-1.15T$\text{}_{c}$ temperature range, where the colossal magnetoresistance effect is observed. The behavior of spectra suggests that a scenario of the phase separation is realized and the mixed state is not related to a simple chemical inhomogeneity. The changes of the conductivity induced by the microwave resonance absorption are observed in a vicinity of T$\text{}_{c}$, too. The changes are not related to a trivial heating of the sample by a microwave radiation. We propose a mechanism connected with the change of equilibrium concentrations of the coexisting phases, this change takes place when the system is under magnetic resonance conditions. To analyze the experimental data we applied the effective-medium approximation for two-component system. Also we attracted the simplest phenomenological model qualitatively reproducing the essential features of the behavior of the two-phase system

Magnetic resonance in FeNi/Bi/FeNi films

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The magnetic resonance in FeNi/Bi/FeNi trilayer films with nonmagnetic semimetal spacer has been experimentally studied. It is found that the microwave absorption spectrum of samples has a complicated shape dependent on the nonmagnetic spacer thickness. In the interval of Bi layer thicknesses within 3–15 nm, the interlayer coupling has an antiferromagnetic character. © 2015, Pleiades Publishing, Ltd

Magnetic resonance in FeNi/Bi/FeNi films

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The magnetic resonance in FeNi/Bi/FeNi trilayer films with nonmagnetic semimetal spacer has been experimentally studied. It is found that the microwave absorption spectrum of samples has a complicated shape dependent on the nonmagnetic spacer thickness. In the interval of Bi layer thicknesses within 3–15 nm, the interlayer coupling has an antiferromagnetic character. © 2015, Pleiades Publishing, Ltd