Control of Spin-Density-Wave Magnetic Structures using Interface Effects

利用界面效应控制自旋密度波磁结构

• 批准号: 15540338
• 负责人: MIBU Ko
• 金额: $ 1.92万
• 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: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540338/
• 关键词: Chromium; Spin-density wave; Interface effect; Magnetic structure; Thin film; Multilayer; Neutron diffraction; Mossbauer spectroscopy

The spin structure (magnetic structure) of Cr, which is a typical material having a "spin-density-wave" magnetic structure, was controlled using interface effects. Bulk Cr has a body-centered cubic (bcc) structure and, below the magnetic transition temperature of 311 K, shows a spin-density-wave antiferromagnetic structure, where the spin magnetic moments align parallel in each bcc (001) plane and antiparallel between adjacent bcc (001) planes and modulate sinusoidally with a period of 6 to 8 nm. Epitaxial Cr/X multilayers, which have a structure where monatomic layers of element X are periodically embedded in a Cr film, were grown by ultrahigh-vacuum deposition and the spin structures were examined by neutron diffraction and Mossbauer spectroscopy. It was found that novel spin structures, which are not observed in bulk Cr, appear in the multilayers due to the pinning of antinodes or nodes of spin-density-wave modulation at the embedded X atoms through interface effects. The spin structures were dependent on the sort of the inserted element and thus can be controlled by selecting the counter element. It was also found that the spin structures of bcc (001)-oriented Cr/X multilayers and those of bcc (011)-oriented multilayers are quite different even when the Cr layer thickness is the same. These results are interpreted by the competition between the "nesting effect" and the interface effect. In this way, it was demonstrated that spin-density-wave magnetic structures can be controlled by making use of the interface effects.

铬是一种典型的具有“自旋密度波”磁性结构的材料，利用界面效应对其自旋结构（磁性结构）进行了控制。体铬具有体心立方（bcc）结构，在311 K的磁转变温度下，呈现自旋密度波反铁磁结构，自旋磁矩在每个bcc（001）面平行排列，在相邻的bcc（001）面反平行排列，并以6 ~ 8 nm的周期正弦调制。采用超高真空沉积法制备了单原子层X元素周期性嵌入Cr膜的外延Cr/X多层膜，并用中子衍射和穆斯堡尔谱分析了其自旋结构。研究发现，由于界面效应在嵌入的X原子上钉住了自旋密度波调制的天线或节点，在多层膜中出现了在体铬中未观察到的新的自旋结构。自旋结构依赖于插入元件的种类，因此可以通过选择计数器元件来控制。在Cr层厚度相同的情况下，bcc（001）取向Cr/X多层膜的自旋结构与bcc（011）取向多层膜的自旋结构有很大的不同。这些结果可以用“嵌套效应”和界面效应之间的竞争来解释。从而证明了利用界面效应可以控制自旋密度波磁结构。

项目成果

Control of Spin-Density Waves in Cr by Periodic Insertion of Nonmagnetic Monatomic Layers

通过周期性插入非磁性单原子层控制 Cr 中的自旋密度波

• 发表时间: 2005
• 期刊: Activity Report on Neutron Scattering Research 12
• 作者: K.Okada;A.Kotani;L.-C.Duda;K.Mibu et al.
• 通讯作者: K.Mibu et al.

Spin Structure of Chromium Modified by an Interface Effect in Cr(011)/Sn Multilayers

Cr(011)/Sn 多层膜中界面效应修饰的铬自旋结构

• 发表时间: 2005
• 期刊: Physical Review B (印刷中)
• 作者: K.Mibu.N.Jiko;M.Takeda;N.Jiko et al.
• 通讯作者: N.Jiko et al.

Magnetic Properties of Thin Chromium Layers in Gd/Cr and Y/Cr Multilayers Studied using ^<119>Sn Mossbauer Spectroscopy

使用 ^<119>Sn 穆斯堡尔谱研究 Gd/Cr 和 Y/Cr 多层中薄铬层的磁性

• 发表时间: 2005
• 期刊: IEEE Transactions on Magnetics 41
• 作者: I.-C.Duda;T.Schmitt;M.Magnuson;J.Forsberg;A.Olsson;J.Nordgren;K.Okada;A.Kotani;N.Jiko et al.;N.Jiko et al.
• 通讯作者: N.Jiko et al.

Growth-orientation dependence of magnetic properties of Cr-based multilayers with 119Sn monatomic layers

具有 119Sn 单原子层的 Cr 基多层磁性的生长方向依赖性

• DOI: 10.1016/j.jmmm.2003.12.070
• 发表时间: 2004
• 作者: N. Jiko;M. Almokhtar;M. Takeda;J. Suzuki;T. Shinjo;K. Mibu
• 通讯作者: K. Mibu

Magnetic Structure of Spin-Density Waves in Cr(001)/Sn Multi layers with Periodic Monatomic Spacer Layer of Nonmagnetic Sn

具有非磁性 Sn 周期性单原子间隔层的 Cr(001)/Sn 多层中自旋密度波的磁结构

• 发表时间: 2004
• 期刊: Physical Review B 70
• 作者: M.Takeda;K.Mibu;T.Shinjo;Y.Endoh;J.Suzuki
• 通讯作者: J.Suzuki