Competition of spin currents and spin-flip scattering in ultrafast magnetization dynamics of Co/Cu(001) analyzed by complex time-resolved MOKE
Competition of spin currents and spin-flip scattering in ultrafast magnetization dynamics of Co/Cu(001) analyzed by complex time-resolved MOKE
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DOI：
10.1103/physrevb.92.174410
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发表时间：
2015-03
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通讯作者：
J. Wieczorek;A. Eschenlohr;B. Weidtmann;M. Rösner;N. Bergeard;A. Tarasevitch;T. Wehling;U. Bovensiepen
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作者：
J. Wieczorek;A. Eschenlohr;B. Weidtmann;M. Rösner;N. Bergeard;A. Tarasevitch;T. Wehling;U. Bovensiepen
通过比较磁光克尔效应(MOKE)中极化旋转率和椭圆度的超快变化，利用该方法的有效深度灵敏度，观测到了Co/Cu(001)薄膜中随时间变化的磁化强度分布M(z，t)。通过分析这些分布的时空关联，我们发现在超热电子热化(200fS)之前的时间尺度上，局域自旋翻转过程占主导地位。
Comparing the ultrafast changes of the polarization rotation and ellipticity in the magneto-optical Kerr effect (MOKE) we observe a time-dependent magnetization profile M(z,t) in Co/Cu(001) films by exploiting the effective depth sensitivity of the method. By analyzing the spatio-temporal correlation of these profiles we find that on time scales before hot electron thermalization ( 200 fs) local spin-flip processes dominate.