Spin-Wave Modes in Exchange-Coupled FePt/FeNi Bilayer Films

被引：5
|
作者：
Li Shu-Fa [1 ]
He Pan [2 ]
Cheng Chu-Yuan [1 ]
Zhou Shi-Ming [2 ]
Lai Tian-Shu [1 ]
机构：
[1] Sun Yat Sen Univ, Sch Phys & Engn, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China
[2] Tongji Univ, Dept Phys, Shanghai 200092, Peoples R China
来源：
CHINESE PHYSICS LETTERS | 2014年 / 31卷 / 01期
基金：
中国国家自然科学基金;
关键词：
D O I：
10.1088/0256-307X/31/1/017502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A simple magnetic modulation structure of the exchange-coupling FePt/FeNi bilayer film is fabricated and studied for its magnetization dynamics using time-resolved magneto-optical polar Kerr spectroscopy. It is found that two spin-wave modes can be excited. One is fixed at similar to 3.2 GHz in frequency for any external field and may serve as a frequency-stabilized spin-wave filter, while the other is external field dependent. In contrast, only the external field-dependent mode is excited in single-layer FeNi, supporting the localized origin of the mode at similar to 3.2 GHz, which is confined to a thin exchange-coupling region. The other external field-dependent mode in frequency is attributed to the Kittel mode.
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页数：5
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