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論文

Manipulation of saturation magnetization and perpendicular magnetic anisotropy in epitaxial Co$$_{x}$$Mn$$_{4-x}$$N films with ferrimagnetic compensation

伊藤 啓太*; 安富 陽子*; Zhu, S.*; Nurmamat, M.*; 田原 昌樹*; 都甲 薫*; 秋山 了太*; 竹田 幸治; 斎藤 祐児; 小口 多美夫*; et al.

Physical Review B, 101(10), p.104401_1 - 104401_8, 2020/03

 被引用回数:1 パーセンタイル:31.73(Materials Science, Multidisciplinary)

Spintronics devices utilizing a magnetic domain wall motion have attracted increasing attention, and ferrimagentic materials with almost compensated magnetic moments are highly required to realize the fast magnetic domain wall motion. Here, we report a key function for this purpose in anti-perovskite Co$$_{x}$$Mn$$_{4-x}$$N films. Perpendicular magnetization emerges for $$0.8 leq x$$, and the saturation magnetization reaches a minimum value at $$x = 0.8$$.

論文

Preferred site occupation of 3$$d$$ atoms in Ni$$_{x}$$Fe$$_{4-x}$$N (${it x}$ = 1 and 3) films revealed by X-ray absorption spectroscopy and magnetic circular dichroism

高田 郁弥*; 伊藤 啓太*; 竹田 幸治; 斎藤 祐児; 高梨 弘毅*; 木村 昭夫*; 末益 崇*

Physical Review Materials (Internet), 2(2), p.024407_1 - 024407_5, 2018/02

 被引用回数:7 パーセンタイル:43.2(Materials Science, Multidisciplinary)

X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism measurements were performed at the Ni and Fe $$L_{2,3}$$ absorption edges for Ni$$_{x}$$Fe$$_{4-x}$$N (${it x}$ = 1 and 3) epitaxial films. Shoulders at approximately 2 eV above the Ni $$L_{2,3}$$ main peaks in the XAS spectrum of Ni$$_{3}$$FeN were interpreted to originate from hybridization of orbitals between Ni 3$$d$$ at face-centered (II) sites and N 2$$p$$ at body-centered sites, while such features were missing in NiFe$$_{3}$$N film. Similar shoulders were observed at Fe $$L_{2,3}$$ edges in both films. Hence, Ni atoms preferentially occupied corner (I) sites, where the hybridization was weak because of the relatively long distance between Ni at I sites and N atoms. The relatively large magnetic moment deduced from sum-rule analysis of NiFe$$_{3}$$N also showed a good agreement with the presence of Ni atoms at I sites.

論文

Local electronic states of Fe$$_{4}$$N films revealed by X-ray absorption spectroscopy and X-ray magnetic circular dichroism

伊藤 啓太*; 都甲 薫*; 竹田 幸治; 斎藤 祐児; 小口 多美夫*; 末益 崇*; 木村 昭夫*

Journal of Applied Physics, 117(19), p.193906_1 - 193906_6, 2015/05

 被引用回数:9 パーセンタイル:50.26(Physics, Applied)

We performed XAS and XMCD measurements at Fe L$$_{2,3}$$ and N K-edges for Fe$$_{4}$$N epitaxial films grown by MBE. We compared experimental XAS and XMCD spectra with those simulated by a combination of a first-principles calculation and Fermi's golden rule. We revealed that the shoulders observed at Fe L$$_{2,3}$$-edges in the XAS and XMCD spectra were due to the electric dipole transition from the Fe 2p core-level to the hybridization state generated by $$sigma$$$$^{ast}$$ anti-bonding between the orbitals of N 2p at the body-centered site and Fe 3d on the face-centered (II) sites. Thus, the observed shoulders were attributed to the local electronic structure of Fe atoms at II sites. As to the N K-edge, the line shape of the obtained spectra was explained by the dipole transition from the N 1s core-level to the hybridization state formed by $$pi$$$$^{ast}$$ and $$sigma$$$$^{ast}$$ anti-bondings between the Fe 3d and N 2p orbitals.

論文

X-ray magnetic circular dichroism for Co$$_{x}$$Fe$$_{4-x}$$N (x = 0, 3, 4) films grown by molecular beam epitaxy

伊藤 啓太*; 佐内 辰徳*; 安富 陽子*; Zhu, S.-Y.*; 都甲 薫*; 竹田 幸治; 斎藤 祐児; 木村 昭夫*; 末益 崇*

Journal of Applied Physics, 115(17), p.17C712_1 - 17C712_3, 2014/05

 被引用回数:15 パーセンタイル:35.4(Physics, Applied)

We evaluated orbital ($$m_{rm orb}$$) and spin magnetic moments ($$m_{rm spin}$$) of Co$$_{x}$$Fe$$_{4-x}$$N (x = 0, 3, 4) epitaxial thin films grown by molecular beam epitaxy using X-ray magnetic circular dichroism, and discussed the dependence of these values on x. Site-averaged $$m_{rm spin}$$ value of Fe atoms was deduced to be 1.91 $$mu$$$$_{B}$$ per atom, and that of Co atoms to be 1.47 $$mu$$$$_{B}$$ per atom in Co$$_{3}$$FeN at 300 K. These values are close to 1.87 $$mu$$$$_{B}$$ per Fe atom in Fe$$_{4}$$N and 1.43 $$mu$$$$_{B}$$ per Co atom in Co$$_{4}$$N, respectively. This result implies that the Fe and Co atoms in the Co$$_{3}$$FeN films were located both at corner and face-centered sites in the anti-perovskite lattice. Spin magnetic moments per unit cell were decreased linearly with increasing x in Co$$_{x}$$Fe$$_{4-x}$$N. This tendency is in good agreement with theory predicted by the first-principle calculation.

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