Manipulating magnetic anisotropy and ultrafast spin dynamics of magnetic nanostructures

doi:10.1088/1674-1056/24/7/077505

摘要/Abstract

摘要：

We present our extensive research into magnetic anisotropy. We tuned the terrace width of Si(111) substrate by a novel method: varying the direction of heating current and consequently manipulating the magnetic anisotropy of magnetic structures on the stepped substrate by decorating its atomic steps. Laser-induced ultrafast demagnetization of a CoFeB/MgO/CoFeB magnetic tunneling junction was explored by the time-resolved magneto-optical Kerr effect (TRMOKE) for both the parallel state (P state) and the antiparallel state (AP state) of the magnetizations between two magnetic layers. It was observed that the demagnetization time is shorter and the magnitude of demagnetization is larger in the AP state than those in the P state. These behaviors are attributed to the ultrafast spin transfer between two CoFeB layers via the tunneling of hot electrons through the MgO barrier. Our observation indicates that ultrafast demagnetization can be engineered by the hot electron tunneling current. This opens the door to manipulate the ultrafast spin current in magnetic tunneling junctions. Furthermore, an all-optical TR-MOKE technique provides the flexibility for exploring the nonlinear magnetization dynamics in ferromagnetic materials, especially with metallic materials.

关键词: magnetic anisotropy, ultrafast spin dynamics, magnetic nanostructures

Abstract:

Key words: magnetic anisotropy, ultrafast spin dynamics, magnetic nanostructures

中图分类号: (Magnetization dynamics)

75.78.-n

75.40.Gb (Dynamic properties?) 76.50.+g (Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance) 75.70.-i (Magnetic properties of thin films, surfaces, and interfaces)

成昭华, 何为, 张向群, 孙达力, 杜海峰, 吴琼, 叶军, 房亚鹏, 刘郝亮. Manipulating magnetic anisotropy and ultrafast spin dynamics of magnetic nanostructures[J]. 中国物理B, 2015, 24(7): 77505-077505.

Cheng Zhao-Hua (成昭华), He Wei (何为), Zhang Xiang-Qun (张向群), Sun Da-Li (孙达力), Du Hai-Feng (杜海峰), Wu Qiong (吴琼), Ye Jun (叶军), Fang Ya-Peng (房亚鹏), Liu Hao-Liang (刘郝亮). Manipulating magnetic anisotropy and ultrafast spin dynamics of magnetic nanostructures[J]. Chin. Phys. B, 2015, 24(7): 77505-077505.

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