Abstract

The magnetization reversal of the MgO/CoFeB/Ta/CoFeB/MgO/Ta/GaAs heterostructures and the ultrathin MgO/CoFeB/MgO/Ta/GaAs films with a perpendicular anisotropy in the magnetic field of clusters of Fe/Fe₃O₄ nanoparticles is experimentally observed. The stray magnetic field of Fe/Fe₃O₄ nanoparticles increases the field of switching the magnetization of spin valves and monolayer platforms. The size of the magnetization reversal region of the ferromagnetic platform under Fe/Fe₃O₄ nanoparticles as a function of the cluster size was determined by atomic force and magnetic force microscopy. The size of the magnetization reversal region is found to be larger than the particle cluster size, which is caused by the stray field of a cluster of Fe/Fe₃O₄ nanoparticles. The local magnetization orientations in the CoFeB layers under clusters of nanoparticles and the magnetization reversal region diameter are determined as functions of the magnetic moment and the size of the cluster using micromagnetic simulation.

中文翻译：

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Fe / Fe 3 O 4纳米粒子的杂散场中铁磁CoFeB薄膜的磁化反转和CoFeB / Ta / CoFeB异质结构

摘要

Fe / Fe ₃ O ₄纳米粒子簇的磁场中具有垂直各向异性的MgO / CoFeB / Ta / CoFeB / MgO / Ta / GaAs异质结构和超薄MgO / CoFeB / MgO / Ta / GaAs薄膜的磁化反转实验观察到的。Fe / Fe ₃ O ₄纳米粒子的杂散磁场增加了旋转阀和单层平台的磁化强度的切换范围。Fe / Fe ₃ O ₄下铁磁平台磁化反转区域的大小通过原子力和磁力显微镜确定纳米颗粒作为团簇尺寸的函数。发现磁化反转区域的尺寸大于颗粒簇的尺寸，这是由于Fe / Fe ₃ O ₄纳米颗粒簇的杂散场引起的。使用微磁模拟确定了纳米粒子簇下的CoFeB层中的局部磁化取向和磁化反转区域的直径，作为磁矩和簇尺寸的函数。