Sort J, Hoffmann A, Chung S-H, Buchanan K S, Grimsditch M, Baró M D, Dieny B, Nogués J
Departament de Física, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
Phys Rev Lett. 2005 Aug 5;95(6):067201. doi: 10.1103/PhysRevLett.95.067201. Epub 2005 Aug 1.
Submicron, circular, ferromagnetic-antiferromagnetic dots exhibit different magnetization reversal mechanisms depending on the direction of the magnetic applied field. Shifted, constricted hysteresis loops, typical for vortex formation, are observed for fields along the exchange bias direction. However, for fields applied close to perpendicular to the exchange bias direction, magnetization reversal occurs via coherent rotation. Magnetic force microscopy imaging together with micromagnetic simulations are used to further clarify the different magnetic switching behaviors.
亚微米级的圆形铁磁-反铁磁点根据外加磁场的方向表现出不同的磁化反转机制。对于沿交换偏置方向的磁场，观察到了典型的涡旋形成所导致的滞后回线的偏移和收缩。然而，对于接近垂直于交换偏置方向施加的磁场，磁化反转通过相干旋转发生。磁力显微镜成像与微磁模拟相结合，用于进一步阐明不同的磁开关行为。
