Inverted Hysteresis, Magnetic Domains, and Hysterons
Inverted Hysteresis, Magnetic Domains, and Hysterons
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DOI：
10.1109/lmag.2020.3035136
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发表时间：
2020
影响因子：
1.2
通讯作者：
I. Soldatov;P. Andrei;R. Schaefer
中科院分区：
文献类型：
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作者：
I. Soldatov;P. Andrei;R. Schaefer
在这封信中，我们在扩展样品上使用磁光克尔效应磁强计来测量局部迟滞曲线，作为无磁致伸缩的非晶带和椭圆坡莫合金薄膜元件的外部外加场的函数。虽然这些材料是磁性软的，矫顽力场几乎为零，但我们发现局部迟滞曲线具有高度非线性的迟滞特征，在循环回路时显示逆时针和顺时针旋转感觉。这种意想不到的结果可以通过将材料的总滞后曲线视为局部曲线的叠加来解释，并且可以使用Preisach模型的形式进行数学描述。在该模型的框架内，我们推导了顺时针和逆时针磁滞环叠加可导致无磁滞系统的条件，并设计了一种将定义一阶反向曲线分布的磁滞映射到试件物理区域的技术。
In this letter, we use magnetooptical Kerr effect magnetometry on extended samples to measure local hysteresis curves as a function of an externally applied field in a magnetostriction-free amorphous ribbon and an elliptical Permalloy film element. Although these materials are magnetically soft and have almost zero coercive field, we find that the local hysteresis curves have a highly nonlinear hysteretic character, displaying both counterclockwise and clockwise rotation senses when cycling the loops. This unexpected result can be explained by looking at the total hysteresis curve of the materials as a superposition of local curves and can be described mathematically using the formalism of the Preisach model. Within the framework of this model, we derive the conditions under which a superposition of clockwise and counterclockwise hysteresis loops can lead to a hysteresis-less system, and devise a technique to map the hysterons that define the first-order reversal-curve distribution to physical regions in the specimens.