磁系统的机器学习原子间电位的准确性和局限性:关于Fe-Cr-C的案例研究
E O Khazieva1, N M Chtchelkatchev2, N N Katkov1
1Ural Branch of the Russian Academy of Sciences, Institute of Metallurgy, Vatolin , of the , Amundsena Street 101, Yekaterinburg 620016, Russia.
Physical review. E
|December 23, 2025
概括
磁性材料的机器学习原子间电位 (MLIP) 需要仔细选择训练数据. 对于动态性质,非磁性数据是足够的,而对于磁性合金的静态性质,旋极化数据至关重要.
科学领域:
- 计算材料科学科学 计算材料科学
- 凝聚物质物理学 凝聚物质物理学
- 材料 信息学 信息学
背景情况:
- 机器学习的原子间潜力 (MLIP) 对于原子模拟越来越重要.
- 将MLIP应用于磁性材料是具有挑战性的,因为需要考虑旋转波动.
- 该Fe-Cr-C系统在技术上具有重要意义,使其成为磁合金模拟的关键测试案例.
研究的目的:
- 调查训练数据 (非磁性与自旋偏振) 对磁性合金MLIP精度的影响.
- 为构建磁性材料的MLIP开发高效的策略,包括转移学习.
- 将专业MLIP的性能与最先进的基础模型进行比较.
主要方法:
- 使用DeePMD框架构建了两个深度机器学习潜力 (DP-NM,DP-M),分别在非磁性和自旋极化DFT数据上进行训练.
- 采用转移学习策略:对非磁性数据进行预训练,然后对旋极化数据进行微调.
- 根据实验数据验证的MLIP,并根据动态和静态性质的基础模型 (MACE,GRACE,DPA3) 进行基准测试.
主要成果:
- 非磁训练电位 (DP-NM) 准确地重现了诸如粘度和点之类的动态性质.
- 旋极化训练电位 (DP-M) 在描述密度等静态性质方面表现出色,特别是在富含铁的合金中.
- 转移学习显著降低了自旋偏振数据的计算成本,超过一个数量级.
- 基础模型虽然在微调后准确,但在分子动力学模拟中速度较慢.
结论:
- 非磁性训练数据对于准磁性化的动态性质是充足的.
- 旋转极化训练对于铁磁相的精确静态特性至关重要.
- 建立了磁合金中的MLIP的明确设计原则,指导高效的开发,并澄清了基础模型和转移学习的作用.
更多相关视频
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
8.5K
06:53Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
Published on: June 9, 2023
2.6K
相关概念视频
01:31Ferromagnetism
2.9K
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...
2.9K
02:58Crystal Field Theory - Octahedral Complexes
30.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
30.4K
02:42Valence Bond Theory
11.1K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.1K
01:31Magnetic Susceptibility and Permeability
2.2K
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...
2.2K
01:14NMR Spectrometers: Resolution and Error Correction
1.0K
When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
1.0K
01:30Paramagnetism
2.9K
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...
2.9K