Resonant switching for an in-plane magnetized L10-FePt | Ni81Fe19 bilayer under spin wave excitation
Resonant switching for an in-plane magnetized L10-FePt | Ni81Fe19 bilayer under spin wave excitation
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DOI：
10.1088/0022-3727/49/7/075002
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发表时间：
2016-01
期刊：
影响因子：
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通讯作者：
T. Seki;Weinan Zhou;K. Takanashi
中科院分区：
文献类型：
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作者：
T. Seki;Weinan Zhou;K. Takanashi
本文研究了交换耦合双层膜在自旋波激发下的磁化动力学和磁化翻转机制。面内磁化的L10-FePt和Ni 81 Fe 19（坡莫合金; Py）层通过界面交换耦合，并且当施加外部磁场时，由于L10-FePt和Py之间的切换场（Hsw）的差异，形成空间扭曲的磁结构。微加工双层元件的铁磁共振谱表明存在多种量子化自旋波模式。在量子化的自旋波模式中，当施加外部射频磁场（Hrf）大大激发磁化动力学时，垂直自旋驻波（PSSW）模式被显著放大。因此，由于PSSW的帮助，微制造的双层元件显示出明显的Hsw降低。此外，窄Hsw分布观察到自旋波辅助磁化翻转。我们研究了自旋波辅助磁化翻转的特征趋势，使用脉冲式Hrf应用测量，发现共振磁化翻转主要是在激发PSSW模式的条件下引起的，但意外的非共振开关也出现在高磁场。
We report the magnetization dynamics and the magnetization switching mechanism under spin wave excitation in exchange-coupled bilayers. The in-plane magnetized L10-FePt and Ni81Fe19 (permalloy; Py) layers were exchange-coupled through the interface, and the spatially twisted magnetic structure was formed when the external magnetic field was applied owing to the difference in the switching fields (Hsw) between L10-FePt and Py. The ferromagnetic resonance spectra for the microfabricated bilayer element indicated that several kinds of quantized spin wave modes existed. Among the quantized spin wave modes, the perpendicular standing spin wave (PSSW) modes were amplified remarkably when the magnetization dynamics were largely excited by applying the external rf magnetic field (Hrf). Consequently, the microfabricated bilayer element showed clear Hsw reduction due to the assistance of PSSW. In addition, narrow Hsw distribution was observed for the spin wave-assisted magnetization switching. We examined the characteristic tendency of spin wave-assisted magnetization switching using pulse-like Hrf application measurement, and found that the resonant magnetization switching was mainly induced in the conditions exciting the PSSW modes but unexpected off-resonant switching also appeared at the high magnetic field.