Gao Ya, Hu Jia-Mian, Wu Liang, Nan C W
School of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, People's Republic of China.
J Phys Condens Matter. 2015 Dec 23;27(50):504005. doi: 10.1088/0953-8984/27/50/504005. Epub 2015 Nov 27.
Voltage control of magnetism in multiferroic heterostructures provides a promising solution to the excessive heating in spintronic devices. Direct observation of voltage-modulated magnetic domain evolution dynamics is desirable for studying the mechanism of the voltage control of magnetism at mesoscale, but has remained challenging. Here we explored a characterization method for the dynamic in situ evolution of pure voltage modulated magnetic domains in the heterostructures by employing the scanning Kerr microscopy function in the magneto optic Kerr effect system. The local magnetization reorientation of a Ni/PMN-PT heterostructure were characterized under sweeping applied voltage on the PMN-PT single crystal, and the results show that the magnetization rotation angle in the local regions is much greater than that obtained from macroscopic magnetization hysteresis loops.
多铁性异质结构中磁性的电压控制为解决自旋电子器件中的过度发热问题提供了一个有前景的方案。直接观测电压调制磁畴演化动力学对于研究中尺度下磁性电压控制的机制是很有必要的，但仍然具有挑战性。在此，我们通过利用磁光克尔效应系统中的扫描克尔显微镜功能，探索了一种用于表征异质结构中纯电压调制磁畴动态原位演化的方法。在PMN-PT单晶上施加扫掠电压时，对Ni/PMN-PT异质结构的局部磁化重新取向进行了表征，结果表明局部区域的磁化旋转角度远大于从宏观磁化滞回环获得的角度。
