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

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 -3.2 GHz in frequency for...

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Published inChinese physics letters Vol. 31; no. 1; pp. 165 - 169
Main Author 李树发 何攀 程樗元 周仕明 赖天树
Format Journal Article
LanguageEnglish
Published 2014
Subjects
Dynamic structural analysis
Exchange
Excitation
FePt
Ferrous alloys
Intermetallics
Iron compounds
Magnetization
Platinum compounds
交换耦合
依赖性
双层薄膜
波模
自旋波
镍铁
频率稳定
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ISSN0256-307X
1741-3540
DOI10.1088/0256-307X/31/1/017502

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Summary: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 -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 -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.
Bibliography: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 -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 -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.
11-1959/O4
LI Shu-Fa, HE Pan, CHENG Chu-Yuan, ZHOU Shi-Ming, LAI Tian-Shu（ 1State-Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering Sun Yat-Sen University, Guangzhou 510275 ~ Department of Physics, TonKji University, Shanghai 200092）
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ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/31/1/017502