在Kagome反铁磁体中,磁阻,压磁性和域核化
Qingkai Meng1, Jianting Dong1, Pan Nie1
1Wuhan National High Magnetic Field Center and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China.
Nature communications
|August 12, 2024
概括
我们发现Mn3Sn在室温下表现出显著的线性磁阻,这与其独特的磁性结构和锡空缺有关. 这种反应是由场诱导的自旋扭曲驱动的,为磁电材料揭示了一条新的途径.
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
- 磁力学 磁力学 是一种
背景情况:
- 磁阻力描述了磁性材料在受到磁场影响时的形状变化.
- 磁场诱导应变的现象 - - 压磁,与线性磁阻密切相关.
- 具有韦尔节点的非对线性反铁磁体对其新型电子和磁性特性感兴趣.
研究的目的:
- 为了研究Mn3Sn,一个非线性反铁磁体的磁力强化反应.
- 探索线性磁阻,自发磁化和Mn3Sn.中的锡空缺之间的关系.
- 为了阐明这种材料中磁阻和压磁的潜在机制.
主要方法:
- 在室温下实验测量纵向和横向磁阻.
- 对具有不同Mn:Sn比率的Mn3Sn样本进行分析,以研究锡空缺的影响.
- 磁强度数据与自发磁化和压磁性测量结果的相关性.
- 理论建模以解释观察到的旋转纹理和应变合.
主要成果:
- 在室温下,Mn3Sn表现出很大的,几乎是线性磁阻,主要是在kagome平面内.
- 在线性磁阻,自发磁化和空位的度之间发现了强烈的相关性.
- 场诱导的平面内旋转转被确定为磁力和压磁两者的驱动机制.
- 锡空隙被证明会扭曲旋转纹理,从数量上解释实验观察.
- 场诱导的域核化与相位过渡相对应,产生扭曲磁条.
结论:
- 3Sn是利用线性磁阻和压磁的应用的一个有前途的材料.
- 锡空缺在调整Mn3Sn.的磁强性和压磁性特性方面发挥着至关重要的作用.
- 弹性和磁性能量之间的相互作用,受旋转纹理扭曲的影响,决定了观察到的现象.
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
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
Potential Due to a Magnetized Object
270
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...
270
Magnetic Susceptibility and Permeability
1.0K
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...
1.0K
Atomic Nuclei: Nuclear Relaxation Processes
634
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.
634


