Nonreciprocal Dzyaloshinskii-Moriya Magnetoacoustic Waves

被引：72
|
作者：
Kuess, M. [1 ]
Heigl, M. [2 ]
Flacke, L. [3 ,4 ]
Hoerner, A. [1 ]
Weiler, M. [3 ,4 ,5 ]
Albrecht, M. [2 ]
Wixforth, A. [1 ]
机构：
[1] Univ Augsburg, Inst Phys, Expt Phys 1, D-86135 Augsburg, Germany
[2] Univ Augsburg, Inst Phys, Expt Phys 4, D-86135 Augsburg, Germany
[3] Bayer Akad Wissensch, Walther Meissner Inst, D-85748 Garching, Germany
[4] Tech Univ Munich, Phys Dept, D-85748 Garching, Germany
[5] Tech Univ Kaiserslautern, Fachbereich Phys, D-67663 Kaiserslautern, Germany
来源：
PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 21期
关键词：
All Open Access; Green;
D O I：
10.1103/PhysRevLett.125.217203
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study the interaction of surface acoustic waves with spin waves in ultrathin CoFeB/Pt bilayers. Because of the interfacial Dzyaloshinskii-Moriya interaction (DMI), the spin wave dispersion is nondegenerate for oppositely propagating spin waves in CoFeB/Pt. In combination with the additional nonreciprocity of the magnetoacoustic coupling itself, which is independent of the DMI, highly nonreciprocal acoustic wave transmission through the magnetic film is observed. We systematically characterize the magnetoacoustic wave propagation in a thickness series of CoFeB(d)/Pt samples as a function of magnetic field magnitude and direction, and at frequencies up to 7 GHz. We quantitatively model our results to extract the strength of the DMI and magnetoacoustic driving fields.
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页数：6
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