对于奇拉反铁磁的普遍缩放定律
Shijie Xu1,2,3,4,5, Bingqian Dai2, Yuhao Jiang1,3
1National Key Laboratory of Spintronics, Hangzhou International Innovation Institute, Beihang University, 311115, Hangzhou, China.
Nature communications
|May 2, 2024
概括
像Mn3Pt这样的状反铁磁材料表现出两个异常的霍尔效应贡献. 一个普遍的缩放定律解释了这些贡献,对于推进反铁磁自旋电子学至关重要.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 这就是Spintronics.
背景情况:
- 状抗铁磁 (AFM) 材料因其独特的物理,包括贝里相和拓学而被广泛研究.
- 这些材料为新兴的反铁磁自旋电子学领域提供了有希望的基础.
研究的目的:
- 为了研究异常的霍尔效应 (AHE) 在合 AFM Mn3Pt.
- 提出一种普遍的缩放定律,用于在奇拉磁体中的AHE电阻.
- 通过界面电子散射来探索AHE贡献的调制.
主要方法:
- 在Mn3Pt.中对AHE进行实验性研究.
- 理论建模以建立一个通用的AHE缩放规律.
- 分析AHE组件与薄膜厚度之间的关系.
主要成果:
- 在Mn3Pt中确定了两个不同的AHE贡献:内在的 (时间逆向对称性破坏) 和拓的 (由于外平面旋转倾斜而导致的斜散射).
- 提出了一个通用的AHE缩放定律,将标量旋转性 (SSC) 诱导的斜散射和非线性旋转纹理诱导的内在AHE术语纳入其中.
- 证明了这些AHE贡献是通过界面电子散射来调节的,显示了对反向薄膜厚度的线性依赖.
结论:
- 拟议的缩放法有效地解释了Mn3Pt中的AHE,并且适用于其他性磁体.
- 介面电子散射在调节AHE贡献方面发挥着关键作用.
- 这些发现对开发基于奇拉的自旋电子设备具有重大意义.
相关概念视频
Gauss's Law: Cylindrical Symmetry
7.6K
A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
7.6K
Gauss's Law: Spherical Symmetry
7.5K
A charge distribution has spherical symmetry if the density of charge depends only on the distance from a point in space and not on the direction. In other words, if the system is rotated, it doesn't look different. For instance, if a sphere of radius R is uniformly charged with charge density ρ0, then the distribution has spherical symmetry. On the other hand, if a sphere of radius R is charged so that the top half of the sphere has a uniform charge density ρ1 and the bottom half...
7.5K
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
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
Coulomb's Law
9.2K
Experiments with electric charges have shown that if two objects each have an electric charge, they exert an electric force on each other. The magnitude of the force is linearly proportional to the net charge on each object and inversely proportional to the square of the distance between them. The direction of the force vector is along the imaginary line joining the two objects and is dictated by the signs of the charges involved.
Newton's third law applies to the Coulomb force — the...
Newton's third law applies to the Coulomb force — the...
9.2K
Gauss's Law: Planar Symmetry
7.9K
A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
7.9K


