Magnetic Pseudoresonance in Manganite Thin Films
Magnetic Pseudoresonance in Manganite Thin Films
复制标题
锰酸盐薄膜中的磁赝谐振
DOI：
10.1007/s00723-014-0554-2
复制
发表时间：
2014
影响因子：
1
通讯作者：
V. Y. Nagorkin
中科院分区：
文献类型：
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作者：
V. A. Atsarkin;V. Demidov;A. E. Mefed;V. Y. Nagorkin
在薄膜平面内具有单轴磁各向异性的La2/3Sr1/3MnO_3外延薄膜中，发现并研究了射频吸收随场效应的一个很强的窄峰(磁共振伪共振)。当面内外加磁场H垂直于易轴且等于各向异性场HU时，观察到峰值。在10-300 MHz频率范围内测得的峰值幅值与频率的关系近似符合德拜定律，特征弛豫时间约为2.2 ns。提出了这一现象的物理模型，其基础是当接近伪共振条件时，由于平衡磁化强度的急剧重新取向，静态横向磁化率急剧增加。
A strong narrow peak in the field dependence of the radio-frequency absorption (the magnetic pseudoresonance) has been found and investigated in epitaxial thin films of La2/3Sr1/3MnO3 possessing uniaxial magnetic anisotropy in the film plane. The peak is observed when the in-plane external magnetic field H is directed perpendicular to the easy axis and equals to the anisotropy field Hu. The frequency dependence of the peak magnitude measured in the frequency range of 10–300 MHz approximately follows the Debye law behavior with the characteristic relaxation time of about 2.2 ns. The physical model of the phenomenon is suggested, based on the giant increase in static transversal susceptibility due to a sharp reorientation of the equilibrium magnetization when approaching the pseudoresonance conditions.