Gilbert damping in single and multilayer ultrathin films: Role of interfaces in nonlocal spin dynamics
Gilbert damping in single and multilayer ultrathin films: Role of interfaces in nonlocal spin dynamics
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DOI：
10.1103/physrevlett.87.217204
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发表时间：
2001-11-19
影响因子：
8.6
通讯作者：
Heinrich, B
中科院分区：
文献类型：
--
作者：
Urban, R;Woltersdorf, G;Heinrich, B
利用分子束外延制备的磁性单层和双层结构，通过铁磁共振（FMR）研究了磁性多层膜中吉尔伯特阻尼的独特特性。双层结构铁膜的铁磁共振线宽大于相同厚度的单层铁膜的铁磁共振线宽。附加FMR线宽与膜厚成反比，随微波频率的增加而线性增加。这些结果表明，磁性层之间的电子角动量的转移导致额外的弛豫力矩。
Unique features of the Gilbert damping in magnetic multilayers were investigated by ferromagnetic resonance (FMR) using magnetic single and double layer structures prepared by molecular beam epitaxy. The FMR linewidth for the Fe films in the double layer structures was larger than the FMR linewidth in the single Fe films having the same thickness. The additional FMR linewidth scaled inversely with the film thickness, and increased linearly with increasing microwave frequency. These results demonstrate that a transfer of electron angular momentum between the magnetic layers leads to additional relaxation torques.