表面活化剂对超高密度磁记录薄膜材料性能影响的研究

项目名称： 表面活化剂对超高密度磁记录薄膜材料性能影响的研究

项目编号： No.50871014

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 电工技术

项目作者： 于广华

作者单位： 北京科技大学

项目金额： 35万元

中文摘要： 本项目是针对目前信息存储技术的迫切需求开发新一代超高密度磁记录材料面临的材料制备的关键问题所提出的一项应用基础研究，本研究提出在制备性能优良的FePt薄膜和SmCo薄膜的基础上，通过插入适当种类、适当含量或厚度的表面活化剂以及组成适当的"多层膜结构"以降低FePt薄膜的有序化温度（或SmCo薄膜的晶化温度）、磁交换耦合作用以及提高薄膜的磁性能，为超高密度磁记录薄膜材料实用化提供科学依据；并在纳米尺度上表征薄膜材料的微结构，弄清表面活化剂对其作用机理。

中文关键词： L10-FePt薄膜；有序化温度；垂直磁各向异性;磁交换耦合作用。

英文摘要： A series of FePtBi/Au multilayers were fabricated by magnetron sputtering. Perpendicular magnetic anisotropy of the L10-FePt film can be remarkably enhanced with the epitaxial inducement of Au atoms. On the other hand, intergranular exchange coupling （IEC）of the film is greatly decreased due to the isolation of FePt particles by nonmagnetic Au particles. Moreover, the controllable coercivity of the film can be realized by adjusting ordering degree of the film through diffusion of Bi atoms. Thus,a L10-FePt perpendicular film with controllable coercivity and no IEC is realized with the interfacial microstructure control of surfactant Bi and Au atoms.Based on the interfacial anisotropy manipulation of multilayer structure and the orientation manipulation of surfactant Au atoms, Fe/Pt/Au multilayers were designed to achieve tunable perpendicular magnetic anisotropy (PMA) of L10-FePt nanocomposite films. In the mean time, the ordering degree of the Fe/Pt/Au multilayers was modified by adjusting the defect concentration in the film, which can be controlled by using different multilayer structures and by the diffusion of Au atoms. This makes the coercivity (HC)of L10-FePt nanocomposite films able to be tailored. Thus a L10-FePt nanocomposite film with high PMA and tunable HC was constructed.

英文关键词： L10-FePtfilm；ordering temperature; perpendicular magnetic anisotropy; interparticle exchange coupling.