通过表面状态介导的旋转轨道扭矩在硬铁磁拓绝缘体中进行巨型大厅切换
Lixuan Tai1, Haoran He1, Su Kong Chong1
1Department of Electrical and Computer Engineering, University of California, Los Angeles, CA, 90095, USA.
Advanced materials (Deerfield Beach, Fla.)
|September 23, 2024
概括
这项研究证明了在V-doped (Bi,Sb) 2Te3 (VBST) 硬磁拓绝缘体中有效的旋转轨道扭矩 (SOT) 切换. 由于其高性能和简化读出,VBST显示了节能磁性存储器设备的潜力.
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:
- 拓绝缘器 (TI) 和磁拓绝缘器 (MTI) 提供高效的旋转轨道扭矩 (SOT) 通过独特的拓表面状态 (TSS) 进行磁化操纵.
- 开发具有大强制场的材料对于强大的磁性内存应用至关重要,防止意外的外部磁场干扰.
研究的目的:
- 为了证明高效的SOT切换在一个硬磁拓绝缘体,特别是V-doped (Bi,Sb) 2Te3 (VBST).
- 通过评估其 SOT 切换效率和读取能力,研究 VBST 对节能磁性存储器设备的潜力.
主要方法:
- 使用V-doped (Bi,Sb) 2Te3 (VBST) 作为一个硬磁拓绝缘体.
- 通过测量切换所需的电流密度来研究SOT切换效率.
- 通过通过门和组成调整费米水平来分析运输特性和SOT有效场.
- 测量异常的霍尔电阻用于读出机制的评估.
主要成果:
- 在VBST中实现了高效的SOT切换,具有很大的强制场.
- 实现了9.2kΩ的巨型开关异常霍尔电阻,简化了没有复杂磁道结 (MTJ) 结构的读数.
- 将SOT开关电流密度降低到2.8 × 10^5 A cm-2,表明高效率.
- 通过调整费米水平,观察到SOT有效场增强至 (1.56 ± 0.12) × 10−6 T A−1 cm2和接口充电转旋转换效率提高至3.9 ± 0.3 nm−1.
结论:
- V-doped (Bi,Sb) 2Te3 (VBST) 是有效的SOT切换材料,因为它具有硬磁性和拓表面状态.
- 在VBST中的大型异常霍尔电阻提供了一个可行的读取机制,消除了复杂的MTJ结构的需要.
- 对于开发下一代节能磁性存储器设备而言,VBST是一个有前途的候选人.
相关概念视频
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
The Hall Effect
2.3K
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.
2.3K
Torque On A Current Loop In A Magnetic Field
3.9K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
3.9K
Atomic Nuclei: Nuclear Spin State Overview
897
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
897
Types Of Superconductors
947
A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
947
Force On A Current Loop In A Magnetic Field
3.2K
Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process,...
3.2K


