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The study of magnetic properties of NiAs-type ferromagnetic/antiferromagnetic multilayer films

NiAs型铁磁/反铁磁多层薄膜的磁性能研究

基本信息

批准号：
63540239
负责人：
TAKANASHI Koki
金额：
$ 1.28万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

NiAs-type multilayer films consisting of ferromagnetic MnSb and antiferromagnetic CrSb were prepared by a dual-type rf sputtering method on glass substrates. Two targets were used: one was a MnSb alloy target, and the other was a Cr target on which some Sb sheets were placed. The multilayer period was designed in the range from 50 to 200A^^ﾟ, keeping the thickness of MnSb and CrSb layers equal. The X-ray diffraction results indicated that all the multilayer films had a strongly preferred [110] orientation perpendicular to the film plane. However, the multilayer periodicity was not confirmed because the atomic scattering factors of Mn and Cr are very close to each other. The magnetization at low temperatures measured in MnSb/CrSb multilayer films were somewhat larger than that in a MnSb compound. The Curie temperature was also found to decrease with decreasing the multilayer period. One reason of these results is considered to be the interdiffusion near the interface. The temperature dependence of magnetization showed a bend at about 100K and 180K. These bends are considered to result from the modulated exchange interaction.Heusler compound type multilayer films consisting of ferromagnetic PtMnSb and antiferromagnetic CuMnSb were also prepared. The magnetization behavior in PtMnSb/CuMnSb multilayer films showed two peculiar characteristics: (i) a great enhancement of magnetization at low temperatures, and (ii) a bend in the temperature dependence of magnetization at about 50K near the Neel temperature of CuMnSb. These results are of much interest, being similar to the MnSb/CrSb case. For the future, we must search for the systematic understanding of the magnetization behavior in the ferromagnetic/ antiferromagnetic multilayer films in terms of the modulated exchange interaction.

用双型射频溅射法在玻璃衬底上制备了由铁磁MnSb和反铁磁CrSb组成的NiAs型多层膜。使用两种靶：一种是MnSb合金靶，另一种是Cr靶，其上放置一些Sb片。多层周期设计在50 ~ 200埃的范围内，保持MnSb和CrSb层的厚度相等。X射线衍射结果表明，所有多层膜都具有垂直于膜面的强择优[110]取向。然而，由于Mn和Cr的原子散射因子彼此非常接近，因此未证实多层膜的周期性。MnSb/CrSb多层膜在低温下的磁化强度比MnSb化合物稍大。居里温度也被发现，减少多层周期。这些结果的一个原因被认为是界面附近的互扩散。磁化强度随温度的变化在100 K和180 K附近出现弯曲。我们还制备了由铁磁PtMnSb和反铁磁CuMnSb组成的Heusler复合型多层膜。PtMnSb/CuMnSb多层膜的磁化行为表现出两个独特的特征：（i）低温下磁化强度显著增强;（ii）在CuMnSb的Neel温度附近，磁化强度随温度的变化在50 K左右出现弯曲。这些结果是非常有趣的，类似于MnSb/CrSb的情况。今后，我们必须从调制交换相互作用的角度系统地理解铁磁/反铁磁多层膜的磁化行为。