自旋重取向跃迁铁磁共振频率的非平凡温度依赖性
Nontrivial temperature dependence of ferromagnetic resonance frequency for spin reorientation transitions
摘要：
我们发现不寻常的温度依赖性的铁磁共振（FMR）频率$f_{\rm R}$的自旋重取向（SR）的转变，其中易磁化轴的变化取决于温度，观察到在Nd永磁体，Nd $_2$ Fe $_{14}$ B：$f_{\rm R} \sim 0$低于SR转变温度（$T_{\rm R}$），急剧增加的$f_{\rm R}$周围$T_{\rm R}$，并从峰值在较高的温度下降低。SR跃迁导致FMR频率在宽温区的异常行为是不平凡的。通过理论和计算分析，我们揭示了这种温度依赖性的机制。我们推导出$f_{\rm R}$和磁化强度之间的一般关系，以帮助理解的机制，并澄清，横向磁化强度的波动是一个关键成分的共振在所有的温度区域。
英文摘要：
We find unusual temperature dependence of the ferromagnetic resonance (FMR) frequency $f_{\rm R}$ for the spin-reorientation (SR) transition, in which the easy axis changes depending on temperature, observed in the Nd permanent magnet, Nd$_2$Fe$_{14}$B: $f_{\rm R} \sim 0$ below the SR transition temperature ($T_{\rm R}$), drastic increase of $f_{\rm R}$ around $T_{\rm R}$, and decrease from a peak at higher temperatures. It is nontrivial that the SR transition causes the unusual behavior of the FMR frequency in a wide temperature region. We show the mechanism of the temperature dependence by theoretical and computational analyses. We derive a general relation between $f_{\rm R}$ and magnetizations to help the understanding of the mechanism, and clarify that the fluctuation of the transverse magnetization is a key ingredient for the resonance in all temperature regions.
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