| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Spin-Wave Modes in Exchange-Coupled FePt/FeNi Bilayer Films |
| LI Shu-Fa1**, HE Pan2, CHENG Chu-Yuan1, ZHOU Shi-Ming2**, LAI Tian-Shu1** |
1State-Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275
2Department of Physics, Tongji University, Shanghai 200092
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| Cite this article: |
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LI Shu-Fa, HE Pan, CHENG Chu-Yuan et al 2014 Chin. Phys. Lett. 31 017502 |
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Abstract 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.
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Received: 22 August 2013
Published: 28 January 2014
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