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Joint Study on Metallic Artificial Superlattice

金属人工超晶格联合研究

基本信息

批准号：
03044071
负责人：
UCHIYAMA Susumu
金额：
$ 7.04万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

Pd/Co-, Pd/PdCo- and Pd/Ni-multilayers (MLs) with (111) and (100) orientations have been prepared by the RF sputtering method. It was found that the perpendicular magnetic anisotropy of these MLs strongly depends on the crystal orientation. In both Pd/Co- and Pd/PdCo-(100)MLs, perpendicular magnetic anisotropy is induced only when magnetic layers are very thin. In Pd/Ni-MLs, perpendicular magnetic anisotropy is larger in (100)MLs than in (111)MLs. The mechanism of the anisotropy is discussed from the viewpoint of magnetoelastic surface anisotropy.Magnetostriction constants lambda_<111> and lambda_<100> were estimated for (111) oriented polycrystalline PdCo and PtCo alloy films and multilayer films (MLs) from the induced anisotropy. It was found that the magnetostriction constants of Pd/Co and Pt/Co MLs are not determined by the magnetostriction constants of fcc Co, but are strongly affected by those of PdCo and PtCo alloys. This result implies the effect of electron hybridization and/or alloy formation at the interface.Magnetic and magnetooptic properties have been investigated for NdGd/Fe and NdGd/FeCo multilayers prepared by rfsputtering method. At a bilayer period of 10 to 15 A, perpendicular magnetic anisotropy showed the maximum value of about 2.5X10^6 erg/cm_3. Magnetooptic Kerr rotation of the multilayers reach 0.33ﾟ at 400 nm, reflecting the contribution of Nd.The giant magnetoresistance effect of Fe_<16>Ni_<66>Co_<18>/Cu multilayers prepared by the RF magnetron sputtering method is reported. A magnetoresistance ratio as large as 35% is obtained at 300 K, and it oscillates as a function of Cu layer thickness. The oscillation period is about 1 nm, which is similar to the case of Co/Cu multilayers. The maximum interlayer coupling strength for the first peak is about 0.05 erg/cm^2. For the second peak the coupling is as weak as 0.003 erg/cm^2 with a magnetoresistance ratio of 13%.

用射频溅射法制备了（111）和（100）取向的Pd/Co、Pd/PdCo和Pd/Ni多层膜。结果发现，这些ML的垂直磁各向异性强烈依赖于晶体取向。在Pd/Co-和Pd/PdCo-（100）ML中，仅当磁性层非常薄时才诱导垂直磁各向异性。在Pd/Ni-ML中，（100）ML中的垂直磁各向异性大于（111）ML。从磁弹性表面各向异性的观点讨论了各向异性的机制，并<111><100>由感生各向异性估算了（111）取向的多晶PdCo和PtCo合金薄膜以及多层膜的磁致伸缩常数λ_和λ_。结果表明，Pd/Co和Pt/Co多层膜的磁致伸缩常数并不取决于面心立方结构Co的磁致伸缩常数，而是受到PdCo和PtCo合金磁致伸缩常数的强烈影响。研究了用射频溅射法制备的NdGd/Fe和NdGd/FeCo多层膜的磁性和磁光特性。在双层周期为10到15埃时，垂直磁各向异性显示出最大值，约为2.5 × 10^6 erg/cm_3。在400 nm处，多层膜的磁光克尔旋转达到0.33 μ m，反映了Nd的贡献。报道<16><66><18>了用射频磁控溅射法制备的Fe_ Ni_ Co_ /Cu多层膜的巨磁电阻效应。在300 K下获得了高达35%的磁电阻率，并且它作为铜层厚度的函数振荡。振荡周期约为1 nm，与Co/Cu多层膜的情况相似。第一个峰的最大层间耦合强度约为0.05 erg/cm ^2。对于第二个峰，耦合弱至0.003 erg/cm ^2，磁阻比为13%。