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

doi:10.1063/1.4942548

Perpendicular magnetic anisotropy in Co_xMn_4-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

Research output: Contribution to journal › Article › peer-review

34 Citations (Scopus)

Abstract

We grow 25-nm-thick Mn₄N and Co_0.2Mn_3.8N 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 language	English
Article number	056201
Journal	AIP Advances
Volume	6
Issue number	5
DOIs	https://doi.org/10.1063/1.4942548
Publication status	Published - 2016 May 1

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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.",

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T1 - Perpendicular magnetic anisotropy in CoxMn4-xN (x = 0 and 0.2) epitaxial films and possibility of tetragonal Mn4N phase

AU - Ito, Keita

AU - Yasutomi, Yoko

AU - Kabara, Kazuki

AU - Gushi, Toshiki

AU - Higashikozono, Soma

AU - Toko, Kaoru

AU - Tsunoda, Masakiyo

AU - Suemasu, Takashi

PY - 2016/5/1

Y1 - 2016/5/1

N2 - 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.

AB - 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.

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Perpendicular magnetic anisotropy in Co_xMn_4-xN (x = 0 and 0.2) epitaxial films and possibility of tetragonal Mn₄N phase

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