[18p-131-1~6] 10.1 新物質・新機能創成（作製・評価技術）

▼ [18p-131-4] First-principles study on perpendicular magnetic anisotropy at Fe/MgAl₂O₄ interface

〇Keisuke Masuda¹、Yoshio Miura¹ (1.NIMS)

キーワード：perpendicular magnetic anisotropy, magnetic tunnel junction, spinel oxides

We studied interfacial magnetic anisotropy at Fe/MgAl₂O₄ interface by means of the first-principles calculations. We found perpendicular magnetic anisotropy (PMA) with K_i~1.2 mJ/m², which is a little bit smaller than that of the Fe/MgO with a similar barrier thickness. By carrying out the second-order perturbation analysis on the PMA, we clarified that the difference in K_i between Fe/MgAl₂O₄ and Fe/MgO comes from the different contributions from spin-flip scattering terms. We further considered tungsten (W) insertion into the interface of Fe/MgAl₂O₄ and obtained a giant value of K_i (K_i>3.0 mJ/m²).