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

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

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19 Citations (Scopus)

Abstract

We grow 25-nm-thick Mn4N and Co0.2Mn3.8N epitaxial films 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.

Original languageEnglish
Article number056201
JournalAIP Advances
Volume6
Issue number5
DOIs
Publication statusPublished - 2016 May 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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