平行畴壁铁磁材料的磁滞和噪声
Hysteresis and noise in ferromagnetic materials with parallel domain walls
摘要：
我们研究了具有大量平行刚性布洛赫畴壁的铁磁材料中的动态磁滞和巴克豪森噪声。考虑具有强面内单轴各向异性和外磁场驱动的面内磁化的无序铁磁系统，考虑长程偶极相互作用和无序的影响，计算了一组耦合畴壁的运动方程.我们推导出解析表达式的磁电阻率，有关的有效退磁因子，并表明，它有一个对数依赖于域的数量。其次，我们模拟了运动方程，并研究了外场频率和无序度对磁滞和噪声特性的影响。用损耗分离理论很好地解释了动态滞后现象。
英文摘要：
We investigate dynamic hysteresis and Barkhausen noise in ferromagnetic materials with a huge number of parallel and rigid Bloch domain walls. Considering a disordered ferromagnetic system with strong in-plane uniaxial anisotropy and in-plane magnetization driven by an external magnetic field, we calculate the equations of motion for a set of coupled domain walls, considering the effects of the long-range dipolar interactions and disorder. We derive analytically an expression for the magnetic susceptivity, related to the effective demagnetizing factor, and show that it has a logarithmic dependence on the number of domains. Next, we simulate the equations of motion and study the effect of the external field frequency and the disorder on the hysteresis and noise properties. The dynamic hysteresis is very well explained by means of the loss separation theory.
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