Dynamically Tunable Magnon-Magnon Coupling in a Perpendicular Anisotropy Magnetic Garnet-Ferromagnet Bilayer

被引：0

作者：

Fan, Yabin ^{[1
]}

Fakhrul, Takian ^{[1
,2
]}

Hou, Justin T. ^{[3
,4
]}

Chou, Chung-Tao ^{[3
,4
,5
]}

Khurana, Bharat ^{[1
]}

Tserkovnyak, Yaroslav ^{[6
]}

Liu, Luqiao ^{[3
,4
]}

Ross, Caroline A. ^{[1
]}

机构：

[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA

[2] Bangladesh Univ Engn & Technol, Dept Mat & Met Engn, Dhaka 1000, Bangladesh

[3] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

[4] MIT, Microsyst Technol Labs, Cambridge, MA 02139 USA

[5] MIT, Dept Phys, Cambridge, MA 02139 USA

[6] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

来源：

PHYSICAL REVIEW LETTERS | 2025年 / 134卷 / 12期

关键词：

SPIN;

D O I：

10.1103/PhysRevLett.134.126702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We experimentally explore the interfacial coherent spin pumping in the magnon-magnon hybridized regime of a perpendicular anisotropy ferrimagnetic insulator (Bi-substituted yttrium iron garnet, or BiYIG) and ferromagnetic metal (permalloy, or Py) bilayer. In addition to the interfacial exchange couplinginduced avoided crossings between the uniform modes of BiYIG and Py, we observe that the gap opening can be tailored by changing the relative orientations of the BiYIG and Py magnetizations due to a purely dynamic interaction. The avoided-crossing gap opening is small (large) when BiYIG and Py magnetizations are nearly perpendicular (partially collinear) to each other, indicating that interfacial fieldlike torque from spin pumping plays a dominant role. Macrospin simulations with a sizable fieldlike spin-pumping torque agree with the gap opening trend observed in the experiments.

引用

页数：6

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