Department of Chemical Engineering and Materials Science, University of California, Davis, Davis, California 95616, USA.
Department of Electronics and Telecommunications, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway.
Phys Rev Lett. 2013 Sep 6;111(10):107201. doi: 10.1103/PhysRevLett.111.107201. Epub 2013 Sep 3.
The magnetic domains of embedded micromagnets with 2 μm×2 μm dimensions defined in epitaxial La0.7Sr0.3MnO3 (LSMO) thin films and LaFeO3/LSMO bilayers were investigated using soft x-ray magnetic microscopy. Square micromagnets aligned with their edges parallel to the easy axes of LSMO provide an ideal experimental geometry for probing the influence of interface exchange coupling on the magnetic domain patterns. The observation of unique domain patterns not reported for ferromagnetic metal microstructures, namely divergent antiferromagnetic vortex domains and "Z"-type domains, suggests the simultaneous presence of spin-flop coupling and local exchange bias in this system.
采用软 X 射线磁显微镜研究了外延 La0.7Sr0.3MnO3（LSMO）薄膜和 LaFeO3/LSMO 双层中具有 2 μm×2 μm 尺寸的嵌入式微磁铁的磁畴。与 LSMO 的易轴平行排列的正方形微磁铁为探测界面交换耦合对磁畴模式的影响提供了理想的实验几何形状。观察到的独特畴模式在铁磁金属微结构中没有报道，即发散反铁磁涡旋畴和“Z”型畴，表明在该系统中同时存在自旋倾斜耦合和局部交换偏置。
