Enhancement of intrinsic magnetic damping in defect-free epitaxial Fe3O4 thin films
Enhancement of intrinsic magnetic damping in defect-free epitaxial Fe3O4 thin films
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DOI：
10.1063/1.5091503
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发表时间：
2017-10
影响因子：
4
通讯作者：
Xianyang Lu;L. Atkinson;B. Kuerbanjiang;Bo Liu;Guanqiao Li;Yichuan Wang;Junlin Wang;X. Ruan
中科院分区：
文献类型：
--
作者：
Xianyang Lu;L. Atkinson;B. Kuerbanjiang;Bo Liu;Guanqiao Li;Yichuan Wang;Junlin Wang;X. Ruan
通过全光学泵浦探针测量，在缺陷控制外延生长的 Fe$_3$O$_4$$(111)/$YSZ 薄膜中研究了进动自旋动力学中的吉尔伯特阻尼。结果表明，在没有原子缺陷的退火薄膜中只能观察到垂直自旋驻波（PSSW 模式）。数值模拟结果证实除了相干磁进动（基特尔模式）之外还存在驻波。退火后的 Fe$_3$O$_4$ 薄膜的固有阻尼常数 $\alpha_0=0.063\pm0.010$ 明显大于生长薄膜 $\alpha_0=0.039\pm0.004$。我们的工作表明，PSSW 模式导致吉尔伯特阻尼的增强，这与从受激磁振子到无缺陷 Fe$_3$O$_4$ 中均匀自旋进动的附加能量传递通道的出现相关。
Gilbert damping in precessional spin dynamics has been investigated in defect-controlled epitaxial grown Fe$_3$O$_4$$(111)/$YSZ films by all-optical pump-probe measurements. It is demonstrated that the perpendicular standing spin wave (PSSW mode) is exclusively observed in the annealed film without atomic defects. The numerical simulation results confirm the presence of a standing wave in addition to the coherent magnetic precession (Kittel mode). The intrinsic damping constant $\alpha_0=0.063\pm0.010$ of the annealed Fe$_3$O$_4$ film was found to be strikingly larger than that of the as-grown film of $\alpha_0=0.039\pm0.004$. Our work has demonstrated that the PSSW mode leads to the enhancement of the Gilbert damping associated with the emergence of an additional energy transfer channel from the excited magnon to the uniform spin precession in the defect free Fe$_3$O$_4$.