报告题目: |
Spin transport in textured magnetic materials from first principles |
报告人: |
袁喆 博士 |
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University of Twente, The Netherlands
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报告时间: |
2013-01-10 10:00 |
报告地点: |
理科楼三楼报告厅 |
主办单位: |
物理系 |
简介: |
A magnet can point up or down in a magnetic field. In magnetic materials, information is stored digitally by using two such "states". A proposal to store information in high-density "racetrack" memories has focused attention on how electric currents in a magnetic material are affected by twisting of the magnetism (so-called a "domain wall") in between regions ("domains") where the magnetism is either all "up" or all "down". However, disordered itinerant ferromagnetic alloys and magnetic domain walls are not readily amenable to theoretical investigation because of their complexity and long length scales. In a recent work, we investigate diffusive transport through a number of domain wallprofiles of the important magnetic alloy Ni80Fe20, Permalloy, taking into account simultaneously non-collinear magnetism, alloy disorder, and spin-orbit coupling fully quantum mechanically, from first principles. The calculation results will be shown and some of its implications will be discussed.
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