Spin wave dispersion in perpendicularly magnetized synthetic antiferromagnets

被引：2

作者：

Zhang, Tengfei ^{[1
]}

Li, Chaozhong ^{[1
]}

Zhao, Qian ^{[1
]}

Li, Zimu ^{[1
]}

Wang, Quwen ^{[1
]}

Yu, Guoqiang ^{[2
,3
]}

Han, Xiufeng ^{[2
,3
]}

Chai, Guozhi ^{[1
]}

Zhang, Senfu ^{[1
]}

Liu, Qingfang ^{[1
]}

Wang, Jianbo ^{[1
,4
]}

Wei, Jinwu ^{[1
]}

机构：

[1] Lanzhou Univ, Key Lab Magnetism & Magnet Mat, Minist Educ, Lanzhou 730000, Peoples R China

[2] Inst Phys, Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[3] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

[4] Lanzhou Univ, Key Lab Special Funct Mat & Struct Design, Minist Educ, Lanzhou 730000, Peoples R China

来源：

PHYSICAL REVIEW B | 2024年 / 109卷 / 05期

基金：

中国国家自然科学基金;

关键词：

PROPAGATION;

D O I：

10.1103/PhysRevB.109.054406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spin wave is a promising candidate medium to be used as an information carrier and for processing. Knowledge of the spin wave dispersion relation is a prerequisite for its application and the design of devices. Here, we report on spin wave dispersion in perpendicularly magnetized synthetic antiferromagnets (p-SAFs), consisting of two CoFeB layers and a thin W spacer layer. The Brillouin light scattering technique is employed to measure the spin wave dispersion relations as a function of the in-plane magnetic field and wave vector. Two resonance modes are observed in the finite range of the magnetic field, in which the configuration of the magnetic moments in two CoFeB layers can be divided into antiferromagnetic and ferromagnetic states. In addition, we observe a T-type region, where the magnetization in one CoFeB layer lies in the direction of the in-plane magnetic field and the other stays in the out-of-plane direction. The dependences of the frequency on the wave vector demonstrate the spin wave propagation in this case is reciprocal. We also theoretically derive the spin wave dispersion relation for p-SAFs based on the Landau-Lifshitz equation, which agree well with the experimental results.

引用

页数：10

共 47 条

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