Determination of demagnetizing factors using first-order reversal curves and ferromagnetic resonance
Determination of demagnetizing factors using first-order reversal curves and ferromagnetic resonance
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DOI：
10.1063/1.5129969
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发表时间：
2020-01-01
期刊：
影响因子：
1.6
通讯作者：
Heindl, R.
中科院分区：
文献类型：
--
作者：
Muster, K. S.;Heindl, R.
我们提出了一种结合一阶反转曲线(FORC)和铁磁共振(FMR)测量数据来定量分析阵列纳米磁体中的充磁或退磁相互作用的方法。我们开发了一个函数来预测由此产生的力分布：(1)关于内场的高斯本征分布和(2)与样品的磁矩成正比的平均相互作用场。然后，我们对我们的模型进行了最小二乘回归，对纳米线阵列和薄膜的实验力进行了测量。将得到的相互作用场与FMR拟合结果相结合，我们就可以代数地求解有效的轴向和横向退磁因子。我们的实验退磁因子与预期值一致，并为阵列中纳米线之间的退磁相互作用提供了定量证据。(C)2020年作者(S)。
We present a method to quantitatively analyze magnetizing or demagnetizing interactions in arrayed nano-magnets by combining first-order reversal curve (FORC) and ferromagnetic resonance (FMR) measurement data. We develop a function to predict the resulting FORC distribution given: (1) a Gaussian intrinsic distribution in terms of the internal field and (2) a mean interaction field proportional to the sample's magnetic moment. We then perform least-squares regression of our model on experimental FORC measurements of a nanowire array and of a thin film. Combining the obtained interaction field with an FMR fit result allows us to algebraically solve for the effective axial and transverse demagnetizing factors. Our experimental demagnetizing factors agree with expected values and provide quantitative evidence of the demagnetizing interaction between nanowires in an array. (C) 2020 Author(s).