[18p-131-1~6] 10.1 新物質・新機能創成（作製・評価技術）

▲ [18p-131-3] Large perpendicular magnetic anisotropy in Fe/MgAl₂O₄ heterostructures

〇(DC)Qingyi Xiang^1,2、Ruma Mandal¹、Hiroaki Sukegawa¹、Yukiko K Takahashi¹、Seiji Mitani^1,2 (1.NIMS、2.Univ. of Tsukuba)

キーワード：PMA, Spinel, MgAl2O4

MgAl₂O₄ is promising to substitute barrier material of MgO for magnetic tunnel junctions. By engineering the interface conditions through preparing MgAl₂O₄ barrier with direct electron beam evaporation method from a high density sintered target, a large PMA energy density is observed around ~1MJ/m³ after 400°C post-annealing. The PMA can survive after 500°C post-annealing and shows a weak measurement temperature dependence. The effective damping constant was also evaluated to be ~0.02 by time-resolved magneto-optic Kerr effect method under high magnetic fields. This study demonstrated robust interface PMA in ultrathin-Fe/MgAl₂O₄, which is useful for p-MTJ applications.