Epitaxial Mn2.5 Ga thin films with giant perpendicular magnetic anisotropy for spintronic devices

Feng Wu; Shigemi Mizukami; Daisuke Watanabe; Hiroshi Naganuma; Mikihiko Oogane; Yasuo Ando; Terunobu Miyazaki

doi:10.1063/1.3108085

Epitaxial Mn2.5 Ga thin films with giant perpendicular magnetic anisotropy for spintronic devices

Feng Wu, Shigemi Mizukami, Daisuke Watanabe, Hiroshi Naganuma, Mikihiko Oogane, Yasuo Ando, Terunobu Miyazaki

Tohoku University

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

203 Citations (Scopus)

Abstract

We report on epitaxial growth and magnetic properties of Mn2.5 Ga thin films, which were deposited on Cr/MgO single crystal substrates by magnetron sputtering. X-ray diffraction results revealed the epitaxial relationships as Mn2.5 Ga (001) [100] Cr (001) [110] MgO (001) [100]. The presence of (002) and (011) superlattice peaks indicates that the films were crystallized into DO22 ordered structures. The perpendicular magnetic anisotropy (PMA) properties were found to be related to the extent of DO22 chemical ordering. A giant PMA (Ku eff =1.2× 107 erg/ cm3) and low saturation magnetization (Ms =250 emu/ cm3) can be obtained for the film with highest chemical ordering parameter (S=0.8).

Original language	English
Article number	122503
Journal	Applied Physics Letters
Volume	94
Issue number	12
DOIs	https://doi.org/10.1063/1.3108085
Publication status	Published - 2009

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title = "Epitaxial Mn2.5 Ga thin films with giant perpendicular magnetic anisotropy for spintronic devices",

abstract = "We report on epitaxial growth and magnetic properties of Mn2.5 Ga thin films, which were deposited on Cr/MgO single crystal substrates by magnetron sputtering. X-ray diffraction results revealed the epitaxial relationships as Mn2.5 Ga (001) [100] Cr (001) [110] MgO (001) [100]. The presence of (002) and (011) superlattice peaks indicates that the films were crystallized into DO22 ordered structures. The perpendicular magnetic anisotropy (PMA) properties were found to be related to the extent of DO22 chemical ordering. A giant PMA (Ku eff =1.2× 107 erg/ cm3) and low saturation magnetization (Ms =250 emu/ cm3) can be obtained for the film with highest chemical ordering parameter (S=0.8).",

author = "Feng Wu and Shigemi Mizukami and Daisuke Watanabe and Hiroshi Naganuma and Mikihiko Oogane and Yasuo Ando and Terunobu Miyazaki",

note = "Funding Information: This work was financially supported by NEDO “Spintronics Nonvolatile Devices Project.”",

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T1 - Epitaxial Mn2.5 Ga thin films with giant perpendicular magnetic anisotropy for spintronic devices

AU - Wu, Feng

AU - Mizukami, Shigemi

AU - Watanabe, Daisuke

AU - Naganuma, Hiroshi

AU - Oogane, Mikihiko

AU - Ando, Yasuo

AU - Miyazaki, Terunobu

N1 - Funding Information: This work was financially supported by NEDO “Spintronics Nonvolatile Devices Project.”

PY - 2009

Y1 - 2009

N2 - We report on epitaxial growth and magnetic properties of Mn2.5 Ga thin films, which were deposited on Cr/MgO single crystal substrates by magnetron sputtering. X-ray diffraction results revealed the epitaxial relationships as Mn2.5 Ga (001) [100] Cr (001) [110] MgO (001) [100]. The presence of (002) and (011) superlattice peaks indicates that the films were crystallized into DO22 ordered structures. The perpendicular magnetic anisotropy (PMA) properties were found to be related to the extent of DO22 chemical ordering. A giant PMA (Ku eff =1.2× 107 erg/ cm3) and low saturation magnetization (Ms =250 emu/ cm3) can be obtained for the film with highest chemical ordering parameter (S=0.8).

AB - We report on epitaxial growth and magnetic properties of Mn2.5 Ga thin films, which were deposited on Cr/MgO single crystal substrates by magnetron sputtering. X-ray diffraction results revealed the epitaxial relationships as Mn2.5 Ga (001) [100] Cr (001) [110] MgO (001) [100]. The presence of (002) and (011) superlattice peaks indicates that the films were crystallized into DO22 ordered structures. The perpendicular magnetic anisotropy (PMA) properties were found to be related to the extent of DO22 chemical ordering. A giant PMA (Ku eff =1.2× 107 erg/ cm3) and low saturation magnetization (Ms =250 emu/ cm3) can be obtained for the film with highest chemical ordering parameter (S=0.8).

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Epitaxial Mn2.5 Ga thin films with giant perpendicular magnetic anisotropy for spintronic devices

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