Journal Article Perpendicular magnetic anisotropy in CoxMn4−xN (x = 0 and 0.2) epitaxial films and possibility of tetragonal Mn4N phase

Ito, Keita  ,  Yasutomi, Yoko  ,  Kabara, Kazuki  ,  Gushi, Toshiki  ,  Higashikozono, Soma  ,  Toko, Kaoru  ,  Tsunoda, Masakiyo  ,  Suemasu, Takashi

6 ( 5 )  , p.056201 , 2016-05 , American Institute of Physics
We grow 25-nm-thick Mn4N and Co0.2Mn3.8N epitaxialfilms on SrTiO3(001) by molecular beam epitaxy. These films show the tetragonal structure with a tetragonal axial ratio c/a of approximately 0.99. Their magnetic properties are measured at 300 K, and perpendicular magnetic anisotropy is confirmed in both films. There is a tendency that as the Co composition increases, an anisotropy field increases, whereas saturation magnetization and uniaxial magnetic anisotropy energy decrease. First-principles calculation predicts the existence of tetragonal Mn4N phase. This explains the c/a ∼ 0.99 in the Mn4N films regardless of their film thickness and lattice mismatch with substrates used.

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