垂直磁化的决定性切换由平面外的抗阻尼马格农扭矩
Fei Wang1,2, Guoyi Shi1, Dongsheng Yang1
1Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore.
Nature nanotechnology
|July 24, 2024
概括
研究人员使用磁装置演示了垂直磁化的无场切换. 这项创新通过在新型异构结构中利用马格农扭矩,显著降低了旋转子应用中的功耗.
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:
- 磁 (旋波激发) 在磁绝缘器中传输旋转角动量,为电子中电子传输提供了替代方案.
- 马格农扭矩使垂直磁化开关成为可能,但通常需要外部磁场.
- 降低磁性设备的功耗是现代电子产品的一个关键挑战.
研究的目的:
- 开发一种材料系统,用于垂直磁化的无磁场切换.
- 研究WTe2/NiO/CoFeB异构结构中磁传输和扭矩生成的机制.
- 为了证明与现有技术相比,显著减少了电力消耗.
主要方法:
- 制造WTe2 / 抗铁磁绝缘体NiO / 铁磁CoFeB异构结构.
- 马格农电流传播和旋转极化通过NiO层的表征.
- 测量垂直磁化切换效率和功耗.
主要成果:
- 在WTe2/NiO/CoFeB异构结构中实现垂直磁化的无磁场切换.
- 马格农电流通过25纳米的NiO层保持极化,施加出平面的抗阻尼扭矩.
- 与使用飞机内马格农扭矩的对照样本相比,电力消耗减少了190倍.
结论:
- 该WTe2 / NiO / CoFeB系统通过抗阻尼磁扭矩实现高效,无磁场垂直磁化切换.
- 这项工作为低功耗,全电动自旋电子设备铺平了道路.
- 这些发现突出了隔离磁异构的潜力,用于下一代内存和逻辑应用.
更多相关视频
07:42Optimizing Magnetic Force Microscopy Resolution and Sensitivity to Visualize Nanoscale Magnetic Domains
Published on: July 20, 2022
2.7K
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.1K
相关概念视频
Magnetic Damping
446
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
446
Atomic Nuclei: Nuclear Relaxation Processes
643
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.
643
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
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
Potential Due to a Magnetized Object
276
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...
The vector...
276
