倾斜磁化电流驱动纳米接触中自局域和传播自旋波模的实验证据
Experimental evidence of self-localized and propagating spin wave modes in obliquely magnetized current-driven nanocontacts
摘要：
通过对基于纳米接触的自旋力矩振荡器中自旋波激发的角度依赖性的详细实验研究，我们证明了两种不同的自旋波模式可以被激发，具有不同的频率、阈值电流和频率调谐。使用分析理论和微磁模拟，我们确定一个模式作为一个交换占主导地位的传播自旋波，和其他作为一个自本地化的非线性自旋波子弹。基于小波分析的模拟结果表明，这两种模式的明显的同时激发的结果从快速模式跳跃诱导的奥斯特场。
英文摘要：
Through detailed experimental studies of the angular dependence of spin wave excitations in nanocontact-based spin-torque oscillators, we demonstrate that two distinct spin wave modes can be excited, with different frequency, threshold currents and frequency tuneability. Using analytical theory and micromagnetic simulations we identify one mode as an exchange-dominated propagating spin wave, and the other as a self-localized nonlinear spin wave bullet. Wavelet-based analysis of the simulations indicates that the apparent simultaneous excitation of both modes results from rapid mode hopping induced by the Oersted field.
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