Optically and Microwave-Induced Magnetization Precession in [Co/Pt]/NiFe Exchange Springs.
Optically and Microwave-Induced Magnetization Precession in [Co/Pt]/NiFe Exchange Springs.
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DOI：
10.1021/acsami.0c14058
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发表时间：
2020-11
影响因子：
9.5
通讯作者：
Maciej Da Browski;A. Frisk;D. M. Burn;D. G. Newman;C. Klewe;A. N’Diaye;P. Shafer;E. Arenholz;G. Bowden;T. Hesjedal;G. van der Laan;G. Hrkac;R. Hicken
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文献类型：
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作者：
Maciej Da Browski;A. Frisk;D. M. Burn;D. G. Newman;C. Klewe;A. N’Diaye;P. Shafer;E. Arenholz;G. Bowden;T. Hesjedal;G. van der Laan;G. Hrkac;R. Hicken
微波和热辅助磁记录是两种相互竞争的技术，它们极大地提高了硬盘驱动器的容量。通过采用结合垂直和面内磁各向异性的非共线自旋结构，可以进一步提高磁记录过程的效率。在这里，我们研究了[Co/Pt]/NiFe交换弹簧样品的微波和光激发磁化动力学。由此产生的纳米尺度[Co/Pt]/NiFe界面区域内的倾斜磁化允许在扩展的磁场和频率范围内观察到光刺激磁化进动。这一结果可以用印迹磁畴结构的形成来解释，它锁定了磁化方向，使结构对外部扰动更具鲁棒性。调节倾斜的界面磁区结构可以更好地控制光激发的磁化反转和光学产生的自旋电流，这对于未来的超快磁记录和自旋电子应用是至关重要的。
Microwave and heat-assisted magnetic recordings are two competing technologies that have greatly increased the capacity of hard disk drives. The efficiency of the magnetic recording process can be further improved by employing non-collinear spin structures that combine perpendicular and in-plane magnetic anisotropy. Here, we investigate both microwave and optically excited magnetization dynamics in [Co/Pt]/NiFe exchange spring samples. The resulting canted magnetization within the nanoscale [Co/Pt]/NiFe interfacial region allows for optically stimulated magnetization precession to be observed for an extended magnetic field and frequency range. The results can be explained by formation of an imprinted domain structure, which locks the magnetization orientation and makes the structures more robust against external perturbations. Tuning the canted interfacial domain structure may provide greater control of optically excited magnetization reversal and optically generated spin currents, which are of paramount importance for future ultrafast magnetic recording and spintronic applications.