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Magnetic Properties of Artificial Super Lattice and its Application for magneto-optical Recording Media

人工超晶格的磁性能及其在磁光记录介质中的应用

基本信息

批准号：
01460139
负责人：
UCHIYAMA Susumu
金额：
$ 4.35万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

项目摘要

Artificially superstructured as well as compositonally modulated multilayers show often enhanced magnetic anisotropy with the easy axis perpendicular to the film plane, and this anisotropy is very attractive in applications such as magnetic and magneto-optic recording. In this research, we have investigated magnetic properties in two type of multilayers, one is noble metal (Nm) /transition metal (TM) multilayer, the other is rareearth (RE) /transition metal containing light RE, which have advantage to magnetooptic Kerr effect at short wavelength compared with usial TbFeCo alloy.I. NM/TM multilayersMultilayers consists of NM (Pd, Pt, Cu, Au, PdSi) and TM (Co, Ni, PdCo, PtCo, CoZr) layers were prepared by rf sputtering method on glass and/or MgO single crystal substrates. The perpendicular magnetic anisotropy was examined in relation to the magnetostriction, lattice misfits, crystanity and crystal orientations. The results suggest that the perpendicular magnetic anisotropy in NM/PdCo-alloy multilayers originates from the magnetoelastic energy of the PdCo layers under a stress due to the lattice misfits. In both Pd/Co and Pd/Ni multilayers, the anisotropy, was found to depend on the crystal orientation, and the dependence could be attributed to the anisotropic magnetostriction constants of these alloys.II. RE/TM multilayersMagnetic and magneto-optic properties have been investigated for NdGd/Fe and NdGd/FeCo multilayers prepared by rf sputtering method. At bilayer period of 10 to 15 A, perpendicular magnetic anisotropy showed the maximum value of about 2.5 X 10^6 erg/cm^3, magneto-optic Kerr rotation in the multilayers reach 0.33 at 400 nm, reflecting the contribution of Nd.

人工超结构以及组合调制的多层膜通常表现出增强的磁各向异性，易磁化轴垂直于薄膜平面，这种各向异性在磁记录和磁光记录等应用中非常有吸引力。在本研究中，我们研究了两种类型多层膜的磁性能，一种是贵金属（Nm）/过渡金属（TM）多层膜，另一种是稀土（RE）/含轻RE的过渡金属，与常用的TbFeCo合金相比，它们在短波长下具有磁光克尔效应的优势。 NM/TM多层膜由NM（Pd、Pt、Cu、Au、PdSi）和TM（Co、Ni、PdCo、PtCo、CoZr）层组成的多层膜是通过射频溅射方法在玻璃和/或MgO单晶基板上制备的。研究了垂直磁各向异性与磁致伸缩、晶格失配、结晶度和晶体取向的关系。结果表明，NM/PdCo 合金多层中的垂直磁各向异性源于 PdCo 层在晶格失配引起的应力下的磁弹性能。在Pd/Co和Pd/Ni多层中，各向异性被发现取决于晶体取向，并且这种依赖性可归因于这些合金的各向异性磁致伸缩常数。 RE/TM 多层膜研究了射频溅射法制备的 NdGd/Fe 和 NdGd/FeCo 多层膜的磁性能和磁光性能。在双层周期为10~15 A时，垂直磁各向异性表现出最大值，约为2.5 X 10^6 erg/cm^3，多层膜中的磁光克尔旋转在400 nm处达到0.33，反映了Nd的贡献。