磁性材料与器件的磁光克尔检测

团队：磁光检测项目团队（负责人：张学莹博士）

项目介绍：基于磁光克尔效应，研究磁性薄膜材料和自旋电子器件中的磁性动力学过程，探索电子自旋相关的物理效应。同时为自旋电子器件，如传感器的优化提供支撑。目前，团队已开发多套不同功能的磁光测试设备，如高分辨率（300nm）磁光克尔显微镜、基于磁光克尔成像的DMI测试系统、磁滞回线扫描系统、变温（4-500 K）磁光克尔成像系统、磁光克尔成像与高频电学测试结合的磁光电综合测试系统；正在开发矢量分辨的磁光探测系统和基于飞秒激光的超快克尔成像系统。

磁光检测团队同时开展以下学术课题研究：（1）磁场及电流驱动磁畴壁动力学观察，以及相关效应如自旋轨道矩，DMI的探测等；（2）斯格明子的仿真及实验研究；（3）基于低温磁光测试系统（成像+磁滞回线扫描）的二维铁磁材料测试；（4）超快磁性动力学研究，如超快克尔成像、光翻转等；（5）新型自旋电子器件，如磁隧道结、磁传感器的设计与仿真分析；（6）商用磁光克尔显微镜、磁滞回线测试系统的研发及产业化等。

近三年来，该团队发表如下论文：

[1] X. Zhang, W. Cai, X. Zhang, Z. Wang, Z. Li, Y. Zhang, K. Cao, N. Lei, W. Kang, Y. Zhang, H. Yu, Y. Zhou, and W. Zhao, Skyrmions in Magnetic Tunnel Junctions, ACS Appl. Mater. Interfaces 10, 16887 (2018).

[2] X. Zhang, N. Vernier, W. Zhao, H. Yu, L. Vila, Y. Zhang, and D. Ravelosona, Direct Observation of Domain-Wall Surface Tension by Deflating or Inflating a Magnetic Bubble, Phys. Rev. Appl. 9, 024032 (2018).

[3] A. Cao, X. Zhang, B. Koopmans, S. Peng, Y. Zhang, Z. Wang, S. Yan, H. Yang, and W. Zhao, Tuning the Dzyaloshinskii–Moriya interaction in Pt/Co/MgO heterostructures through the MgO thickness, Nanoscale 10, 12062 (2018).

[4] Y. Zhang, X. Zhang, N. Vernier, Z. Zhang, G. Agnus, J.-R. Coudevylle, X. Lin, Y. Zhang, Y. Zhang, W. Zhao, and D. Ravelosona, Domain-Wall Motion Driven by Laplace Pressure in CoFeB/MgO Nanodots with Perpendicular Anisotropy, Phys. Rev. Appl. 9, 064027 (2018).

[5] X. Zhang, N. Vernier, Z. Cao, Q. Leng, A. Cao, D. Ravelosona, and W. Zhao, Magnetoresistive sensors based on the elasticity of domain walls, Nanotechnology 29, 365502 (2018).

[6] L. Zhang, X. Zhang, M. Wang, Z. Wang, W. Cai, K. Cao, D. Zhu, H. Yang, and W. Zhao, Size dependence of the spin-orbit torque induced magnetic reversal in W/CoFeB/MgO nanostructures, Appl. Phys. Lett. 112, 142410 (2018).

[7] X. Zhang, N. Vernier, W. Zhao, L. Vila, and D. Ravelosona, Extrinsic pinning of magnetic domain walls in CoFeB-MgO nanowires with perpendicular anisotropy, AIP Adv. 8, 056307 (2018).

[8] A. Cao, X. Zhang, Z. Li, Q. Leng, L. Wen, and W. Zhao, A Christmas-Tree-Like Magnetic Field Sensor Based on Domain Wall Depinning in a Notched Nanowire, IEEE Magn. Lett. 9, 1 (2018).

[9] 赵巍胜, 黄阳棋, 张学莹, 康旺, 雷娜, 张有光, 斯格明子电子学的研究进展, 物理学报 67, 131205 (2018).

[10] Y. Zhang, X. Zhang, J. Hu, J. Nan, Z. Zheng, Z. Zhang, Y. Zhang, N. Vernier, D. Ravelosona, and W. Zhao, Ring-shaped Racetrack memory based on spin orbit torque driven chiral domain wall motions, Sci. Rep. 6, 35062 (2016).