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Magnetic Structures of Metallic Multilayers by Resonant X-ray Magnetic Scattering of Circularly Polarized Synchroton X-rays

通过圆偏振同步辐射 X 射线共振 X 射线磁散射研究金属多层膜的磁结构

基本信息

批准号：
13640361
负责人：
HOSOITO Nobuyoshi
金额：
$ 2.62万
依托单位：
NARA INSTITUTE OF SCIENCE AND TECHNOLOGY (2002)Kyoto University (2001)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

1. Magnetic structures of Gd layers in Fe/Gd metallic multilayers were determined by resonant x-ray magnetic diffraction (RXMD) at the Gd L3 absorption edge. The determined magnetic structures above the compensation temperature (ca. 120 K) are consistent with those derived from a simple theoretical method. The measured M-H curves are reproduced from the determined magnetic structures. The magnetic structures below the compensation temperature cannot be derived from the simple theoretical method, indicating the significant effect of the magnetic anisotropy of the Gd layers on the magnetic structures.2. Magnetic structures of Dy layers in Fe/Dy metallic multilayers were determined by RXMD at the Dy L3 absorption edge. The magnetic structures of the Dy layers between 50 and 300 K are similar to those of the Gd layers in the twisted state of the Fe/Gd metallic multilayers. The origin of the Dy magnetic structures, however, is thought to be different from the Gd case. It is thought to be sc … More rew-type magnetic interaction that the bulk Dy metal inherently has.3. The x-ray magnetic circular dichroism (XMCD) spectra of the Gd/Cu metallic multilayers at the Gd L3 and Cu K absorption edges were measured from low temperature up to the Curie temperature of the Gd layer in order to investigate the basic behavior of the magnetic polarization induced in the nonmagnetic layers in constant with the ferromagnetic layers. Both the (5d) magnetic polarization of the Gd layers and the (4p) polarization of the Cu layers, which are relevant to the XMCD spectra, are proportional to the bulk magnetization (mainly Gd 4f). However, the proportional constant for Cu depends on the Cu layer thickness. This indicates that even if the Gd layer magnetization is the same, the total magnetic moment induced in the Cu layer is different when the Cu layer thickness changes.4. The magnetic field dependence of the Co and Cu XMCD spectra was measured for two Co/Cu samples; one (AF sample) showed the giant magnetoresistance (GMR) effect and the other (F sample) did not. The total magnetic polarization of the Cu layer in the F sample is larger than that in the AF sample if we compare them under the same Co XMCD intensities. A tendency is suggested that the AF sample suppresses the ferromagnetic polarization of the Cu layer.5. In order to measure a distribution of a very small magnetic polarization induced in the nonmagnetic Cu layer by RXMD, we are developing a new system using a high counting rate detector. We successfully observed magnetic Bragg peaks of the magnitude of (I(+)-I(-))/(I(+)+I(-)~ 0.001. Less

1.用共振x射线磁衍射（RXMD）方法在Gd的L3吸收边处测定了Fe/Gd金属多层膜中Gd层的磁结构。确定的磁结构高于补偿温度（ca. 120 K）的结果与用简单的理论方法得到的结果一致。根据测定的磁结构再现了实测的M-H曲线。用简单的理论方法无法得到补偿温度以下的磁结构，表明Gd层的磁各向异性对磁结构有显著影响.用RXMD方法测定了Fe/Dy金属多层膜中Dy层的L3吸收边的磁性结构。Dy层在50 ~ 300 K之间的磁结构与Fe/Gd金属多层膜中处于扭曲状态的Gd层的磁结构相似。然而，Dy磁性结构的起源被认为与Gd的情况不同。它被认为是SC ...更多信息体Dy金属固有的rew型磁相互作用。测量了Gd/Cu金属多层膜在Gd L3和Cu K吸收边的X射线磁性圆二色性（XMCD）谱，从低温到Gd层的居里温度，以研究Gd/Cu金属多层膜中与铁磁层恒定的感应磁极化的基本行为。Gd层的（5d）磁极化和Cu层的（4p）磁极化都与体磁化强度（主要是Gd 4f）成正比。然而，Cu的比例常数取决于Cu层厚度。这表明，即使Gd层磁化强度相同，Cu层厚度变化时，Cu层中感应的总磁矩也不同.测量了两个Co/Cu样品的Co和Cu XMCD谱的磁场依赖性;一个（AF样品）显示巨磁电阻（GMR）效应，另一个（F样品）没有。在相同的Co XMCD强度下，F样品中Cu层的总磁极化强度大于AF样品中Cu层的总磁极化强度。AF样品有抑制Cu层铁磁极化的趋势.为了测量一个非常小的磁极化感生在铜层中的RXMD的分布，我们正在开发一个新的系统，使用高计数率检测器。我们成功地观测到了（I（+）-I（-））/（I（+）+I（-）~ 0.001）量级的磁布拉格峰。少