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相关概念视频

Magnetic Fields01:27

Magnetic Fields

7.1K
A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
7.1K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

747
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
747
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

1.2K
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
1.2K
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

1.6K
An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
1.6K
Diamagnetism01:26

Diamagnetism

2.9K
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....
2.9K
Magnetic Force Between Two Parallel Currents01:13

Magnetic Force Between Two Parallel Currents

4.5K
Two long, straight, and parallel current-carrying conductors exert a force of equal magnitude on one another. The direction of the force depends on the current direction in the conductors.
The force exerted by the magnetic field due to the first conductor over a finite length of the second conductor is given as the product of the current in the second conductor and  the vector product of the length vector along the current element and the field due to the first conductor. According to the...
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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在二维系统中的跨州交替磁力.

Xiaokai Chen1, Xiaoyu Xuan1, Wanlin Guo1

  • 1State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education, and Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics (NUAA), Nanjing 210016, China.

Nano letters
|December 19, 2025
PubMed
概括

我们介绍了跨状态交替磁力 (cs-AM),这是一个新奇的现象,可以通过切换材料状态来控制旋转极化. 这一发现为通过电极化操纵磁场的自旋电子设备开辟了新的途径.

关键词:
反铁磁自旋极化反铁磁自旋极化跨状态的交替磁力跨状态的交替磁力多状态旋转电子学一个对称关系的对称关系.

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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:

  • 变磁在一个单一的物质状态内的真实空间和相互空间中呈现交替的自旋极化.
  • 现有的旋转极化控制方法有限,因此需要为先进的旋转电子应用程序采用新的方法.

研究的目的:

  • 提出和理论验证一个新的概念,交叉状态交替磁力 (cs-AM),用于操纵旋转极化.
  • 通过在2D系统中在等价物质状态之间进行过渡来探索切换自旋两极化的可行性.

主要方法:

  • 对称性分析开发了cs-AM的理论.
  • 紧密结合模型模拟以验证状态过渡机制.
  • 在特定的材料系统中进行初始计算以证明cs-AM.

主要成果:

  • 证明由电极化翻转引发的状态转换可以切换变磁体和铁磁体中的自旋极化.
  • 在Lu3N2O2双层中通过层间滑动识别了半金属cs-AM.
  • 在电场下的Cr2SeO双层中揭示了旋转谷锁定的另磁状态.

结论:

  • 交叉状态交替磁力 (cs-AM) 通过利用材料状态变化来控制自旋偏振提供了一个新的范式.
  • 提出的理论和展示的例子突出显示了实现新型自旋电子功能的潜力.
  • 该框架可以通过组合刺激 (如堆叠和铁电) 来对旋转极化进行级联操纵.