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Magnetism of Nonmagnetic Layrs in Magnetic/Nonmagnetic Metallic Multilayrs

磁性/非磁性金属多层膜中非磁性层的磁性

基本信息

批准号：
08640455
负责人：
HOSOITO Nobuyoshi
金额：
$ 1.41万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08640455/
关键词：
Magnetism of nonmagnetic layr Magnetic polarization Indirct exchange interaction ^<119>Sn Mossbauer Spectroscopy ^<57>Fe-Mossbauer spectroscopy Metallic multilayr film ^<119Sn>メスバウア分光法振動的交換相互作用 Fe Au Co Ni

项目摘要

1.Magnetic polarization of Au layrs in M/Au (m=Fe, Co, Ni) multilayrs with ^<119>Sn probes in the Au layrs was investigated from the Sn Mossbauer spectra. The magnitude of the polarization is Co/Au>Fe/Au>Ni/Au (Au thickness s_<Au><=20*)and Fe/Au>Co/Au>Ni/Au (d_<Au>>20*). The polarization penetration into the Au layr is different among three systems. In the Fe/Au, the polarization monotonically decreases from the interface to the inside of the Au layr. In the Co/Au, the attenuation of the polarization is slow below a certain Au thickness. Above this thickness, the polarization suddenly becomes small throughout the Au layr. In the Ni/Au, the polarization is small but almost constant through the Au layr. No proportional relation is observed between the temperature dependence of the magnetization and that of the Au polarization. Both parallel and antiparallel polarizations are confirmed to the magnetization direction, suggesting an oscillatory behavior of the polarization.2.To obtain complementary information to the Sn insertion case, Co/Au multilayrs with ^<57>Fe probes in the Au layr were investigated from the Fe Mossbauer spectra. The interpretation of the Fe spectra is not so easy as that of the Sn spectra because the Fe has magnetic moment. Nevertheless the results are qualitatively consistent to that of the Sn case if we assume that the polarization of the Au layr suppresses a superparamagnetic relaxation of the Fe moment.3.^<57>Fe probes were inserted in the Co layrs of the Co/Au multilayrs with high saturation field as typical in systems with antiferromagnetic interlayr coupling, and it is considered whether the interlayr coupling exists or not. The origin of the high saturation field is not due to the indirect coupling but due to the competition between the perpendicular anisotropy and the magnetostatic energy.

1.利用穆斯堡尔谱研究了在M/Au(m=Fe，Co，Ni)多层膜中用^&lt；119&gt；Sn探针探测Au层的磁极化。极化强度为Co/Au&Gt；Fe/Au&gt；Ni/Au(Au厚度S；&lt；Au&gt；&lt；=20*)和Fe/Au&Gt；Co/Au&gt；Ni/Au(d_&lt；Au&gt；&gt；20*)。三种系统对金层的极化穿透是不同的。在Fe/Au中，极化从界面到Au层内部单调减小。在Co/Au中，在一定的Au厚度以下，极化衰减很慢。在这个厚度以上，整个金层的极化突然变得很小。在Ni/Au中，通过Au层的极化很小，但几乎是恒定的。磁化强度的温度依赖关系与Au极化的温度依赖关系不成比例。在磁化方向上证实了平行极化和反平行极化，表明极化具有振荡行为。2.为了获得与锡插入情况互补的信息，从Fe穆斯堡尔谱中研究了Au层中带有^&lt；57&gt；Fe探针的Co/Au多层膜。由于Fe具有磁矩，所以对Fe光谱的解释不如对Sn谱的解释那么简单。然而，如果我们假设Au层的极化抑制了Fe磁矩的超顺磁弛豫，则结果与锡的情况定性地一致。3.在具有反铁磁层间耦合的系统中，在具有高饱和场的Co/Au多层膜的Co层中插入了^&lt；57&gt；Fe探针，并考虑了层间耦合是否存在。高饱和场的产生不是由于间接耦合，而是由于垂直各向异性和静磁能量的竞争。