形状记忆合金对FePt复合膜磁性能的非易失性调控特征及机理研究

项目名称： 形状记忆合金对FePt复合膜磁性能的非易失性调控特征及机理研究

项目编号： No.51471028

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 一般工业技术

项目作者： 冯春

作者单位： 北京科技大学

项目金额： 85万元

中文摘要： 本项目针对信息存储器件中存在的关键磁性材料的非易失性性能调控难题，拟开展新型FePt基复合磁性材料的应用基础研究。拟解决的科学性问题：（1）通过材料的综合设计，对FePt基复合膜的磁性能（磁各向异性Keff和矫顽场Hc）进行非易失性调控；（2）综合界面附近的晶体结构、磁结构及电子结构等信息，揭示磁性能调控机理。本项目拟利用形状记忆合金作为FePt基复合膜的基底，利用其形状记忆效应产生的非易失性大弹性应变，调控FePt基复合膜的磁晶各向异性、界面各向异性及磁畴运动势垒，进而实现对FePt基复合膜磁性能的非易失性调控。此外，综合利用高分辨电子显微镜、极化中子反射谱、微磁模拟计算及角分辨X射线光电子能谱技术，表征上述薄膜界面附近区域的晶体结构、磁结构和电子结构，以阐明弹性应变对FePt基复合膜磁性能的非易失性调控机理。

中文关键词： 磁性薄膜材料；磁各向异性；矫顽场；非易失性调控；微结构表征

英文摘要： This project is a foundational research which aim to solve the issue of nonvolatile manipulations on magnetic properties of FePt based thin films applicable to the information storage devices, and to develop novel and pragmatic FePt based magnetic materials. The scientific problems should be solved are: (1) Realizing the nonvolatile manipulations on the magnetic properties of FePt based films (magnetic anisotropy Keff and coercivity Hc) by comprehensive materials designation; (2) Exploring the mechanism of magnetic property tunability by characterizing interfacial micro and magneic structure of the FePt based composite films on a nano scale or a atomic scale. In this project, shape memory alloy, which is able to produce an interfacial and nonvolatile elastic strain, is proposed as the substrate or the buffer layer of FePt based films. The nonvolatile manipulation on magnetic properties of FePt based films are expected through tune magnetocrystalline anisotropy, interfacial anisotropy, and energy barrier for FePt mangetic domain motion. Moreover, High resolution transmission electron microscopy,Polarized neutron reflection, micromagnetic simulation, and angle resolved X-ray photoelectron spectroscopy are supposed to characterize the interfacial microstructure and magnetic structure of the films, and to explore the mechanism of the nonvolatile manipulations on the magnetic properties.

英文关键词： magnetic film;magnetic anisotropy;coercivity field;Nonvolatile manipulation;microstructure characterization