轨道角动量相关电荷与旋转转换在金属反铁磁铁中
Zhiqiang Zhu1, Lu Cheng1, Xiaoguang Xu1
1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China.
Advanced materials (Deerfield Beach, Fla.)
|March 17, 2025
概括
这项研究报告了利用Cu*层的轨道效应在IrMn异构结构中提高了旋转轨道扭矩 (SOT) 的效率. 这种方法提高了先进的自旋电子设备的SOT效率.
科学领域:
- 这就是Spintronics.
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 电流诱导的旋转轨道扭矩 (SOT) 能够有效地电气控制旋转器件中的磁化.
- 最大限度地提高SOT效率对于设备性能至关重要,通常是通过增强旋转生成和积累.
- 反铁磁体中的旋转传输受到强合的限制,阻碍了反铁磁装置的开发.
研究的目的:
- 在基于Ir20Mn80 (IrMn) 的异构结构中报告SOT效率的显著提高.
- 研究自然氧化的Cu (Cu*) 底层及其轨道对SOT效率的影响.
- 探索设计高效率的基于SOT的自旋电子设备的新途径.
主要方法:
- 制造具有Cu*底层的基于IrMn的异构结构.
- 调查SOT效率变化与IrMn层厚度的变化.
- 分析轨道电流对旋转电流生成和磁化开关的贡献.
主要成果:
- 在Cu*/IrMn异构结构中观察到SOT效率的显著提高.
- 这种增强归因于Cu*/IrMn接口产生的轨道电流,有助于在IrMn层中产生旋转电流.
- SOT效率变化与IrMn厚度证明轨道角动量 (OAM) 运输和转换.
- 对于SOT驱动磁化开关的临界电流密度下降,验证了轨道电流的贡献.
结论:
- Cu* 层的轨道效应显著提高了基于 IrMn 的异构结构中的 SOT 效率.
- 这项工作展示了一种通过利用轨道电流和反铁磁材料来提高SOT效率的新方法.
- 这些发现为开发下一代高性能的自旋磁器件开辟了道路,通过将OAM和金属反铁磁体结合起来.
更多相关视频
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.0K
08:55Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
8.4K
相关概念视频
Atomic Nuclei: Nuclear Magnetic Moment
1.0K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
1.0K
Magnetic Moment of an Electron
1.1K
Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
1.1K
Diamagnetism
2.4K
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
2.4K
Paramagnetism
2.5K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
2.5K
Angular Momentum: Single Particle
6.0K
Angular momentum is directed perpendicular to the plane of the rotation, and its magnitude depends on the choice of the origin. The perpendicular vector joining the linear momentum vector of an object to the origin is called the “lever arm.” If the lever arm and linear momentum are collinear, then the magnitude of the angular momentum is zero. Therefore, in this case, the object rotates about the origin such that it lies on the rim of the circumference defined by the lever arm...
6.0K
Ferromagnetism
2.4K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.4K
