大异常的霍尔效应,非消失的果曲线在 (110) FeRh反铁磁膜通过接口应变膜
Yun-Ho Kim1, Gil-Sung Kim1, Jae Won Choi1
1Department of Physics, Chung-Ang University, Seoul, Republic of Korea.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|January 28, 2026
概括
我们通过破坏与表轴应变的空间反向对称性,在对直线反铁磁铁薄膜中演示出明显的异常霍尔效应 (AHE). 这一发现使得强大的横向传输成为可能,为反铁磁自旋电子学开辟了新的途径.
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:
- 异常的霍尔效应 (AHE) 通常在铁磁和非线性反铁磁材料中观察到.
- 空间反转 (P) 和时间反转 (T) 的相称性禁止在对直线反铁磁体中产生AHE.
- 破碎的T对称性和旋转轨道合通常是净果曲率所需的.
研究的目的:
- 为了在对线抗铁磁铁薄膜中显示出明显的AHE.
- 为了研究表轴应变和方向在打破P对称性的作用.
- 探索一种新的机制,以在对线反铁磁体中实现AHE.
主要方法:
- 在Al2O3基板上 (110) 导向的FeRh薄膜的表轴生长.
- 在5-100K温度范围内对异常的霍尔效应进行实验测量.
- 第一原则密度函数计算以建模应变诱导的果曲率.
主要成果:
- 在对线抗铁磁铁薄膜中观察到明显的AHE.
- 经证实,表轴方向 (110) 和基质诱导的应变可以打破空间反转对称 (P).
- 计算重现了压力诱导的贝里曲率,并量化解释了测量的AHE.
结论:
- 即使在对直线反铁磁体中,破解P对称性也可以实现有限的Berry曲率和强大的AHE.
- 内在应变是一种可行的方法,用于在对直线反铁磁体中设计贝里曲率.
- 这项工作通过利用拓性质,为新的反铁磁自旋电子应用提供了一条途径.
相关概念视频
The Hall Effect
4.3K
Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
4.3K
Degree of Curvature and Radius of Curvature
481
The degree of curvature and the radius of curvature are fundamental concepts in determining the sharpness or smoothness of a curve. The degree of curvature is a measure of how steeply a curve bends and can be determined using the chord basis or the arc basis. In the chord basis method, the degree of curvature is defined as the central angle subtended by a chord of 30.48 meters, helping in the calculation of the radius of the curve. The arc basis method defines the degree of...
481
Vertebral Column: Regions and Curvature
6.0K
The vertebral column or spine is a flexible column that supports the head, neck, and body and allows for their movements. It also protects the spinal cord.
Regions of the Vertebral Column
In an adult, the spine is subdivided into five regions: the cervical, the thoracic, the lumbar, the sacral, and the coccygeal region. The spine initially develops as a series of 33 vertebrae; after 20 years of age, the nine bones in the sacral region, five sacral, and four coccygeal bones fuse to form...
Regions of the Vertebral Column
In an adult, the spine is subdivided into five regions: the cervical, the thoracic, the lumbar, the sacral, and the coccygeal region. The spine initially develops as a series of 33 vertebrae; after 20 years of age, the nine bones in the sacral region, five sacral, and four coccygeal bones fuse to form...
6.0K
Protein-protein Interfaces
14.7K
Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a...
14.7K
Protein-Protein Interfaces
4.5K
4.5K
Space-Time Curvature and the General Theory of Relativity
4.4K
In 1905, Albert Einstein published his special theory of relativity. According to this theory, no matter in the universe can attain a speed greater than the speed of light in a vacuum, which thus serves as the speed limit of the universe.
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
This has been verified in many experiments. However, space and time are no longer absolute. Two observers moving relative to one another do not agree on the length of objects or the passage of time. The mechanics of objects based on Newton's laws of...
4.4K


