Microwave-Assisted Magnetization Reversal in Exchange-Coupled Composite Media Using Linearly Polarized Microwave Fields

被引：14
|
作者：
Nozaki, Yukio [1 ]
Kasai, Shinya [2 ]
机构：
[1] Keio Univ, Dept Phys, Yokohama, Kanagawa 2238522, Japan
[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
来源：
IEEE TRANSACTIONS ON MAGNETICS | 2016年 / 52卷 / 02期
关键词：
Exchange-coupled composite (ECC); ferromagnetic resonance (FMR); magnetic recording; microwave-assisted magnetization reversal (MAMR); perpendicular granular medium; TIME-DEPENDENCE;
D O I：
10.1109/TMAG.2015.2473668
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We have experimentally demonstrated a microwave-assisted magnetization reversal (MAMR) in exchange-coupled composite (ECC) media using the linearly polarized microwave fields generated by an electrically shorted coplanar waveguide. The MAMR frequency exhibiting a maximum reduction of coercive field can be decreased using 16 nm-thick ECC media without the suppression of the thermal stability of magnetization. The threshold amplitude of microwave field required for the successful MAMR is only 3% of the anisotropy field of the medium. A splitting of ferromagnetic resonance spectrum, which suggests an appearance of stochastic MAMR, can be observed after applying microwave fields. The stochastic MAMR gives rise to the threshold behavior in the condition of microwave field amplitude needed for MAMR.
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页数：7
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