铁磁性薄膜中Spin Vortex微观磁构形加垂直磁场钉扎研究分析论文.doc

铁磁性薄膜中Spin Vortex微观磁构形的 加垂直磁场钉扎研究 物理教育0401 吴香凯 指导教师：苏垣昌 摘要：采用外加圆形小区域垂直强磁场的方法，对模型分别为,，的铁磁性薄膜中出现的Spin Vortex自旋构形进行控制和钉扎。首先在水平外场h0=0的情况下，对于模型，取磁偶极相互作用系数（w）分别为；对于模型，取w分别 为；对于模型，取w分别为,然后加圆形小区域垂直强磁场来控制Spin Vortex自旋构形：先把磁场加在正方形中央位置，逐渐加大圆形区域磁场的圆形半径，看当半径达到多大时，不同的磁偶极相互作用系数对应的Spin Vortex自旋构形才会被破坏或者变得不够理想；再将圆心逐渐偏离正方形中央位置，看Spin Vortex自旋构形的中心是否跟着相应地偏离。然后令外场h0=0.4，外加圆形小区域垂直强磁场对16x16x4模型进行钉扎，并与钉扎之前对比，讨论钉扎的效果。 关键词：磁多层膜，微观磁构形，Spin Vortex自旋构形，漂移，钉扎 Abstract：Plusing a small circular region of strong vertical magnetic field to pin the Spin vortex spin configuration shaped by the model of ferromagnetic films with , , . First of all , in zero magnetic ?eld（h0 = 0）, for the model of , asigning Magnetic dipole interaction coefficient (w) respectly as ;for the model of ,asigning w as ;for the model of ,asigning w as ,then joining a small circular region of strong vertical magnetic field to control them：first let magnetic field locate in the central of the square , gradually increase the radius of circular region of strong vertical magnetic field , to see when how much the radius reach to, Spin vortex spin configuration of the different magnetic dipole interaction coefficient will be destroyed or becomes not ideal;Then gradually depart the central of the circular from the central of the square ,to see whether the centre of the Spin vortex spin configuration correspondingly departs from the centre of the squre.Then when the magnetic field h0 = 0.4, pulsing a small circle region of strong vertical magnetic field on 16 x16x4 model to pin it and compare to that before pinning ,disscusing the effect of pinning. Keyword: Magnetic multilayers, Microscopic magnetic configuration, Spin vortex spin configuration, Drift, pinning 目录 摘要………………………………………………………………………………………………1 关键词……………………………………………………………………………………………1 第一章 引言 ………………………………………………………………………………… 4 一. 低维磁性体系的研究现状………………………………………………………4 二. 铁磁或反铁磁磁多层膜微观自旋构形的研究现状及应用价值 ………………4