用于单畴纳米粒子磁动力学的热 Stoner-Wohlfarth 模型：实现与验证
Thermal Stoner-Wohlfarth Model for Magnetodynamics of Single Domain Nanoparticles: Implementation and Validation
AI总结：
提出并验证用于分子动力学的热 Stoner-Wohlfarth 模型，可在强各向异性条件下高效再现磁性软物质的平衡与动态性质，并兼顾 Néel 与 Brownian 弛豫耦合。
摘要：
我们提出了热 Stoner-Wohlfarth（tSW）模型，并将其应用于分子动力学模拟。在固定温度下，针对不同的各向异性强度以及磁场/磁矩耦合组合，使用一组固定、随机取向的单轴粒子（固态超顺磁体）和一种经典稀磁流体对该模型进行了验证。我们比较了解析结果与模拟结果，以量化 tSW 模型在再现磁性软物质系统平衡性质（包含和不包含偶极-偶极相互作用）及动态性质（不包含偶极-偶极相互作用）方面的可行性。我们表明，当粒子的各向异性比热涨落高五倍以上时，tSW 是适用且高效的。该方法使人们能够考虑 Néel 弛豫与 Brownian 弛豫之间的相互作用，而在基于固定点偶极表示的磁性软物质理论研究中，这种相互作用常被忽略。
英文摘要：
We present the thermal Stoner-Wohlfarth (tSW) model and apply it in the context of Molecular Dynamics simulations. The model is validated against an ensemble of immobilized, randomly oriented uniaxial particles (solid superparamagnet) and a classical dilute ferrofluid for different combinations of anisotropy strength and magnetic field/moment coupling, at a fixed temperature. We compare analytical and simulation results to quantify the viability of the tSW model in reproducing the equilibrium (with and without dipole-dipole interactions) and dynamic (without dipole-dipole interactions) properties of magnetic soft matter systems. We show that if the anisotropy of a particle is more than five times higher than the thermal fluctuations, tSW is applicable and efficient. This approach allows one to consider the interplay between Néel and Brownian relaxation, often neglected in the fixed point-dipole representation-based magnetic soft matter theoretical investigations.
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