The formation mechanism of 360° domain walls in exchange-biased polycrystalline ferromagnetic films
The formation mechanism of 360° domain walls in exchange-biased polycrystalline ferromagnetic films
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DOI：
10.1063/1.3642982
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发表时间：
2011-10-01
影响因子：
3.2
通讯作者：
Schrefl, T.
中科院分区：
文献类型：
--
作者：
Dean, J.;Kohn, A.;Schrefl, T.
描述了在Co（65.5）Fe（14.5）B（20）/Ir（22）Mn（78）交换偏置双层膜中产生360度畴壁（360 DW）的形成机理。的结构和磁性能的实验特征，并纳入颗粒反铁磁薄膜的交换偏置的微磁模型。利用该模型研究和解释了铁磁层中360 DWs的形成机制，这些DWs是由于与反铁磁层的界面耦合而产生的。所得到的计算磁化图的有效性进行检查，通过比较模拟和实验的菲涅尔对比度图像的双层。能量势垒模拟被用来解释的反铁磁层的各向异性能的面积大小和空间频率的360 DW的依赖。这些计算还显示了这种结构如何在室温下在相对较低的外加磁场下形成。基于该模型的计算与洛伦兹透射电子显微镜成像和实测的宏观磁性能一致。(C)2011年美国物理学会。[doi：10.1063/1.3642982]
The formation mechanism of 360 degrees domain walls (360DW) created in an exchange-biased bilayer of Co(65.5)Fe(14.5)B(20)/Ir(22)Mn(78) is described. The structural and magnetic properties are experimentally characterized and incorporated into a micromagnetic model of exchange-bias for granular anti-ferromagnetic films. This model is used to study and explain the formation mechanism of 360DWs in the ferromagnetic layer, which occur due to interface coupling to the antiferromagnetic layer. The validity of the resulting calculated magnetization maps are examined by comparing simulated and experimental Fresnel-contrast images of the bilayer. Energy barrier simulations are used to explain the dependence of the areal size and spatial frequency of the 360DW on the anisotropy energy of the anti-ferromagnetic layer. These calculations also show how such structures can form at room temperature at relatively low applied magnetic fields. Calculations based on this model are in agreement with imaging using Lorentz transmission electron microscopy and the measured macro-magnetic properties. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3642982]