在抗铁磁氧化物中的磁阻力驱动的子定位
Pietro Bonfà1, Ifeanyi John Onuorah1, Franz Lang2
1Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Universitá di Parma, I-43124 Parma, Italy.
Physical review letters
|February 9, 2024
概括
磁性和弹性性质之间的合作用,即磁性和弹性作用,影响在氧化 (MnO) 中植入的位. 这种效应会导致子在经过磁相过渡时在Nel温度下转换有利的子位置.
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
- 量子化学 是一个量子化学.
背景情况:
- 磁阻力源于材料中的磁性和弹性特性之间的相互作用.
- 了解植入的子的行为对于探测局部磁环境至关重要.
- 氧化 (MnO) 具有立方岩盐反铁磁结构,尼尔温度 (T_{N}) 为118K.
研究的目的:
- 为了研究磁力约束在确定在磁性材料中植入子的首选位置的作用.
- 为了解释在MnO中观察到的子数据,特别是磁相转换周围的位置切换现象.
- 为了证明这些发现对其他磁氧化物系统的更广泛的适用性.
主要方法:
- 使用哈伯德纠正密度函数理论 (DFT+U) 的第一原则模拟.
- 分子动力学模拟以捕捉系统的动态行为.
- 在MnO中低于其尼尔温度的磁力拉动驱动结构扭曲的分析.
主要成果:
- 磁约束显著影响了在MnO中植入子的能量有利位置.
- 从T_{N}上方的非局部化子行为过渡到T_{N}下方的局部化位置,这是由于形扭曲造成的.
- 模拟与实验数据保持一致,解决了MnO子研究中长期存在的难题.
结论:
- 磁阻力,尽管其能量贡献很小,但在磁性材料中的位确定中起着至关重要的作用.
- 这项研究解决了先前的MnO子数据中的差异,并考虑了磁阻力诱导的结构变化.
- 这些发现对了解各种磁性氧化物中的子行为和材料特性有重要意义.
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
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
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
Magnetic Moment of an Electron
1.3K
Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...
1.3K
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
Atomic Nuclei: Nuclear Relaxation Processes
654
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.
654
Magnetism
6.3K
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
6.3K
