高磁场磁传输测量FeGe薄板的测量
Long Li1,2, Weiwei Wang1,3, Xitong Xu1
1Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, HFIPS, Anhui, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
概括
这项研究研究了FeGe中的磁性 skyrmions,发现异常的霍尔效应主导低场霍尔电阻,而不是 skyrmion拓. 载体类型的过渡从电子到孔随着温度的增加.
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:
- 磁性skyrmions是拓保护的旋转纹理,具有数据存储的潜力.
- 像FeGe (B20结构) 这样的状磁体承载着这些奇特的准粒子.
- 了解它们对电子运输的影响对于设备应用至关重要.
研究的目的:
- 为了研究磁性 skyrmions 在低磁场下对FeGe中的霍尔效应的影响.
- 分析FeGe在高磁场 (高达28 T) 下的磁阻和霍尔效应.
- 为了阐明Fe.Ge.中的取决于温度的电荷载体行为.
主要方法:
- 洛伦兹传输电子显微镜 (LTEM) 用于形视觉化.
- 在不同的磁场和温度下进行电传输测量 (霍尔效应,磁电阻).
- 对于载体度适配的双载体模型分析.
主要成果:
- 异常的霍尔效应显著影响低磁场的霍尔电阻.
- 在FeGe中, skyrmion诱导的拓霍尔效应的贡献是可以忽略不计的.
- 磁电阻机制在低温和高温之间有所不同.
- 在载体类型中,从电子到孔主导的过渡会随着温度的增加而发生,这是两载体模型所证明的.
结论:
- 异常的霍尔效应,而不是 skyrmion 拓,决定了 FeGe 的低场传输.
- 在占主导地位的电荷载体中,FeGe表现出温度驱动的转移.
- 这些发现提供了关于FeGe用于自旋电子应用的基本磁性和电子性质的见解.
相关概念视频
01:28Magnetic Field Due To A Thin Straight Wire
4.9K
Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
4.9K
01:31Ferromagnetism
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
01:31Magnetic Susceptibility and Permeability
1.2K
In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
1.2K
01:23Magnetic Field due to Moving Charges
8.9K
A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
8.9K
01:16Electric Field of Parallel Conducting Plates
1.0K
Gauss' law relates the electric flux through a closed surface to the net charge enclosed by that surface. Gauss's law can be applied to find the electric field and the charge enclosed in a region depending on its charge distribution.
Consider a cross-section of a thin, infinite conducting plate having a positive charge. For such a large thin plate, as the thickness of the plate tends to zero, the positive charges lie on the plate's two large faces. Without an external electric...
Consider a cross-section of a thin, infinite conducting plate having a positive charge. For such a large thin plate, as the thickness of the plate tends to zero, the positive charges lie on the plate's two large faces. Without an external electric...
1.0K
01:19Magnetic Field Lines
4.2K
The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Magnetic field lines follow several hard-and-fast rules:
4.2K