Magnetic domain texture and the Dzyaloshinskii-Moriya interaction in Pt/Co/IrMn and Pt/Co/FeMn thin films with perpendicular exchange bias
Magnetic domain texture and the Dzyaloshinskii-Moriya interaction in Pt/Co/IrMn and Pt/Co/FeMn thin films with perpendicular exchange bias
复制标题
垂直交换偏置Pt/Co/IrMn和Pt/Co/FeMn薄膜的磁畴织构和Dzyaloshinskii-Moriya相互作用
DOI：
10.1103/physrevb.98.064413
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发表时间：
2018-05
影响因子：
3.7
通讯作者：
R. A. Khan;H. Nembach;Mannan Ali;J. Shaw;C. Marrows;T. Moore
中科院分区：
文献类型：
--
作者：
R. A. Khan;H. Nembach;Mannan Ali;J. Shaw;C. Marrows;T. Moore
Antiferromagnetic materials present us with rich and exciting physics, which we can exploit to open new avenues in spintronic device applications. We explore perpendicularly magnetized exchange biased systems of Pt/Co/IrMn and Pt/Co/FeMn, where the crossover from paramagnetic to antiferromagnetic behavior in the IrMn and FeMn layers is accessed by varying the thickness. We demonstrate, through magneto-optical imaging, that the magnetic domain morphology of the ferromagnetic Co layer is influenced by the Neel order of the antiferromagnet (AFM) layers. We relate these variations to the anisotropy energy of the AFM layer and the ferromagnet-antiferromagnet (FM-AFM) interlayer exchange coupling. We also quantify the interfacial Dzyaloshinskii-Moriya interaction (DMI) in these systems by Brillouin light scattering spectroscopy. The DMI remains unchanged, within experimental uncertainty, for different phases of the AFM layers, which allows us to conclude that the DMI is largely insensitive to both AFM layer spin order and exchange bias. Understanding such fundamental mechanisms is crucial for the development of future devices employing chiral spin textures, such as Neel domain walls and skyrmions, in FM-AFM heterostructures.
