Out-of-plane spin alighnment in ultrathin films of sodium-doped manganites as evidenced by FMR measurements

Doped perovskite manganites RAMnO3 with rare-earth ions R and alkaline (or alkaline-earth) ions A have received considerable attention because of their interesting magnetic, magnetoresistive, and microwave properties [1,2,3]. Much effort, both theoretical and experimental, has been devoted to the investigation of the underlying physics associated with their extraordinary magnetoresistive behavior. In contrast, work on magnetic properties such as magnetic anisotropy and micromagnetic structure is very limited, while the relevant knowledge is obviously a prerequisite for the design and fabrication of heteroepitaxy devices such as spin valves, tunneling junctions, and etc. [4].