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%.

PD/Co-，PD/PDCO-和PD/Ni-Multilayers（MLS）和（111）和（100）方向已通过RF溅射方法制备。发现这些ML的垂直磁各向异性在很大程度上取决于晶体方向。在PD/Co-和PD/PDCO-（100）ML中，垂直磁各向异性仅在磁层非常薄时才能诱导。在PD/Ni-ML中，垂直磁各向异性在（100）MLS中大于（111）MLS。从磁弹性表面各向异性的角度讨论了各向异性的机制。Magnetostriction常数Lambda_ <111>和Lambda_ <100>的（111）方向的多晶PDCO PDCO和PTCO Alloy Films and MultiLayer Films（MLS）（MLS）（MLS）的（111）。发现PD/CO和PT/COML的磁截图常数不是由FCC CO的磁截图常数确定的，而是受PDCO和PTCO合金的磁曲线常数。该结果意味着在接口上电子杂交和/或合金形成的影响。已经研究了通过RFSPuttering方法制备的NDGD/FE和NDGD/FECO多层的NDGD/FE和NDGD/FECO多层的影响。在10至15 a的双层周期，垂直磁各向异性的最大值约为2.5x10^6 erg/cm_3。多层的磁置Kerr旋转在400 nm处达到0.33 ﾟ，反映了ND的贡献。Fe_<16> Ni_ <66> Co_ <18>/CU co <18>/CU多层由RF Magnetron溅射方法报告。在300 K处获得磁倍率高至35％的磁比率，并且它的振荡是Cu层厚度的函数。振荡周期约为1 nm，类似于CO/CU多层。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，耦合弱高达0.003 ERG/cm^2，磁倍率比为13％。