Determination of anisotropy constants via fitting of magnetic hysteresis to numerical calculation of Stoner–Wohlfarth model
Determination of anisotropy constants via fitting of magnetic hysteresis to numerical calculation of Stoner–Wohlfarth model
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DOI：
10.1063/5.0051454
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发表时间：
2021-08
期刊：
影响因子：
1.6
通讯作者：
S. Peterson;Y. Idzerda
中科院分区：
文献类型：
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作者：
S. Peterson;Y. Idzerda
磁性材料的各向异性常数通常通过角分辨铁磁共振（ar-FMR）和扭矩磁力测定法来确定，这可能是耗时的测量，因此限制了它们的实用性。Stoner-Wohlfarth模型可用于数值拟合测得的磁滞曲线，以更容易地确定这些各向异性常数。为了证明这一点，10 nm bct FexCoyMnz单晶薄膜生长的MgO（001）衬底上的分子束外延进行了研究。通过振动样品磁强计测量的滞后行为是最小二乘拟合对从Stoner-Wohlfarth模型产生的数值计算的滞后曲线，以提取各向异性常数。不同成分的FeCoMn薄膜的立方各向异性为104 J/m3，与用ar-FMR和转矩磁测量技术测量的bct Fe和Co薄膜的立方各向异性在同一数量级。
Anisotropy constants of magnetic materials are typically determined through angle-resolved Ferromagnetic Resonance (ar-FMR) and torque magnetometry, which can be time consuming measurements, thus limiting their utility. The Stoner–Wohlfarth model can be used to numerically fit measured magnetic hysteresis curves to more easily determine these anisotropy constants. To demonstrate this, 10 nm bct FexCoyMnz single-crystal films grown by molecular beam epitaxy on MgO(001) substrates were investigated. The hysteresis behavior measured by vibrating sample magnetometry was least-squares fit against numerically calculated hysteresis curves generated from the Stoner–Wohlfarth model to extract the anisotropy constants. The cubic anisotropy of different compositions of FeCoMn films was at ∼104 J/m3, which is on the same order of magnitude of bct Fe and Co thin films measured by ar-FMR and torque magnetometry techniques.