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106-2專題演講-1070509
演講活動
張貼人：李明芳 ╱ 公告日期：2018-02-12|
Time：2018/5/9 (Wed.) 14:20~16:20
Speaker：Prof.徐斌睿(Pin-Jui Hsu)
國立清華大學物理學系/Department of Physics, National Tsing Hua University
Title：利用自旋極化掃描穿隧電子顯微鏡解析和操控磁性斯格明粒子
Imaging and Manipulating Individual Magnetic Skyrmions by Spin-Polarized Scanning Tunneling Microscopy Abstract：
Magnetic skyrmions are topologically protected quasiparticles with whirling spin textures [1-4]. They offer promising perspectives, e.g., robustness against local perturbations [5], motion driven by low current densities [6], and skyrmion Hall effect [7] etc., which are envisioned to be used as magnetic bits in next-generation information technology and skyrmion-based devices. Recently, magnetic ultrathin films [8] and multilayers [9] grown on heavy metal substrates support the formation of individual magnetic skyrmions due to the breaking of inversion symmetry and sizable interfacial Dzyaloshinskii-Moriya (DM) interaction. In this talk, I will report on the studies of magnetic skyrmions in Fe triple-layer (TL) on Ir(111) [10], they show an anisotropic shape due to inherited structural reconstructions followed by Fe double-layer (DL) underneath [11] as resolved by using spin-polarized scanning tunneling microscopy [12-14]. By exploiting the electric fields between the tip and sample, single skyrmions on Fe-TL can be created and annihilated in a controllable fashion. In addition, I will also talk about the isotropic magnetic skyrmions stabilized on Fe-DL by loading the sample with hydrogen atoms. To understand the underlying mechanism, ab initio calculations have been performed and attribute to an increased interlayer distance and consequently modified magnetic interactions, which suggests that hydrogenation provides an unique pathway to engineer crucial magnetic parameters and enables a drastic change of tuning noncollinear magnetism in low-dimensional magnetic materials [15].
Place：Room S101, Gongquan Campuses, NTNU
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最後修改時間：2018-02-23 PM 4:07
