论文标题

旋转seebeck效果中的组成可调磁蛋白 - 果龙异常在外观bi $ _x $ y $ _ $ _ {3-x} $ fe $ _ {5} $ o $ $ _ {12} $ films

Composition-tunable magnon-polaron anomalies in spin Seebeck effects in epitaxial Bi$_x$Y$_{3-x}$Fe$_{5}$O$_{12}$ films

论文作者

Kikkawa, Takashi, Oyanagi, Koichi, Hioki, Tomosato, Ishida, Masahiko, Qiu, Zhiyong, Ramos, Rafael, Hashimoto, Yusuke, Saitoh, Eiji

论文摘要

我们已经调查了Spin Seebeck Effects(SSES)的杂交元音 - Phonon激发(Magnon Polarons),bi $ _x $ _x $ y $ _ {3-x} $ _ {5} $ _ {5} $ o $ $ $ $ _ {12} $(bi $ _x $ _x $ y $ y $ y $ y $ y $ _ $ _ $ _ {3-x} $ _ {3-ig;我们观察到磁场中的尖峰结构$ H $依赖性的纵向SSE(LSSE)电压,当声子分散剂与Bi $ _x $ y $ y $ y $ _ $ _ {3-x} $ ig中的磁子分散曲线相切时会出现。通过增加BI量$ x $,由于LSSE中的峰值字段降低了bi $ _x $ y $ _ $ _ {3-x} $ ig,因此向较低的$ h $值转移了$ H $值。我们还以非局部构型测量了SSE,发现镁 - 桃细胞异常出现不同的符号和强度。我们的结果显示了镁极异常的组合性 - 可谐振性,并提供了进一步揭示镁质 - 果态SSE的物理学的线索。

We have investigated hybridized magnon-phonon excitation (magnon polarons) in spin Seebeck effects (SSEs) in Bi$_x$Y$_{3-x}$Fe$_{5}$O$_{12}$ (Bi$_x$Y$_{3-x}$IG; $x=0$, $0.5$, and $0.9$) films with Pt contact. We observed sharp peak structures in the magnetic field $H$ dependence of the longitudinal SSE (LSSE) voltages, which appear when the phonon dispersions are tangential to the magnon dispersion curve in Bi$_x$Y$_{3-x}$IG. By increasing the Bi amount $x$, the peak fields in the LSSE shift toward lower $H$ values due to the reduction of the sound velocities in Bi$_x$Y$_{3-x}$IG. We also measured the SSE in a nonlocal configuration and found that magnon-polaron anomalies appear with different signs and intensities. Our result shows composition-tunability of magnon-polaron anomalies and provides a clue to further unravel the physics of magnon-polaron SSEs.

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