Buffer-Layer Dependence of Interface Magnetic Anisotropy in Co2Fe0.4Mn0.6Si Heusler Alloy Ultrathin Films

Mingling Sun; Takahide Kubota; Yoshiaki Kawato; Shigeki Takahashi; Arata Tsukamoto; Yoshiaki Sonobe; Koki Takanashi

doi:10.1109/TMAG.2017.2728627

Buffer-Layer Dependence of Interface Magnetic Anisotropy in Co₂Fe_0.4Mn_0.6Si Heusler Alloy Ultrathin Films

Mingling Sun, Takahide Kubota, Yoshiaki Kawato, Shigeki Takahashi, Arata Tsukamoto, Yoshiaki Sonobe, Koki Takanashi

Materials Development Division

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

4 Citations (Scopus)

Abstract

Buffer-layer dependences of dead-layer thickness, saturation magnetization (M_s), and interface magnetic anisotropy (Ks) were systematically investigated for Co₂Fe_0.4Mn_0.6Si (CFMS) Heusler alloy ultrathin films with Pd, Ru, and Cr buffer layers. Perpendicular magnetization was only achieved in 0.6 and 0.8 nm-thick CFMS ultrathin films deposited on Pd buffer layer and annealed at 400 °C. At the optimum annealing temperature of 400 °C, K_S of 1.2 erg/cm² was obtained for the Pd buffer layer, which was 3-6 times larger than those for Ru and Cr buffer layers. The difference in K_S probably originates from the interdiffusion and different crystallized compounds at the interface between Pd (Ru, Cr) and CFMS layers.

Original language	English
Article number	7983443
Journal	IEEE Transactions on Magnetics
Volume	53
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2017.2728627
Publication status	Published - 2017 Nov

Keywords

Heusler alloy
interface anisotropy
perpendicular magnetic anisotropy (PMA)

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2017.2728627

Cite this

@article{1a080ae00d2c4f21a6c429062418bfb9,

title = "Buffer-Layer Dependence of Interface Magnetic Anisotropy in Co2Fe0.4Mn0.6Si Heusler Alloy Ultrathin Films",

abstract = "Buffer-layer dependences of dead-layer thickness, saturation magnetization (Ms), and interface magnetic anisotropy (Ks) were systematically investigated for Co2Fe0.4Mn0.6Si (CFMS) Heusler alloy ultrathin films with Pd, Ru, and Cr buffer layers. Perpendicular magnetization was only achieved in 0.6 and 0.8 nm-thick CFMS ultrathin films deposited on Pd buffer layer and annealed at 400 °C. At the optimum annealing temperature of 400 °C, KS of 1.2 erg/cm2 was obtained for the Pd buffer layer, which was 3-6 times larger than those for Ru and Cr buffer layers. The difference in KS probably originates from the interdiffusion and different crystallized compounds at the interface between Pd (Ru, Cr) and CFMS layers.",

keywords = "Heusler alloy, interface anisotropy, perpendicular magnetic anisotropy (PMA)",

author = "Mingling Sun and Takahide Kubota and Yoshiaki Kawato and Shigeki Takahashi and Arata Tsukamoto and Yoshiaki Sonobe and Koki Takanashi",

note = "Funding Information: ACKNOWLEDGMENT This work was supported in part by MEXT-Supported Program for the Strategic Research Foundation at Private Universities, 2013–2017. Publisher Copyright: {\textcopyright} 1965-2012 IEEE.",

year = "2017",

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AU - Sun, Mingling

AU - Kubota, Takahide

AU - Kawato, Yoshiaki

AU - Takahashi, Shigeki

AU - Tsukamoto, Arata

AU - Sonobe, Yoshiaki

AU - Takanashi, Koki

N1 - Funding Information: ACKNOWLEDGMENT This work was supported in part by MEXT-Supported Program for the Strategic Research Foundation at Private Universities, 2013–2017. Publisher Copyright: © 1965-2012 IEEE.

PY - 2017/11

Y1 - 2017/11

N2 - Buffer-layer dependences of dead-layer thickness, saturation magnetization (Ms), and interface magnetic anisotropy (Ks) were systematically investigated for Co2Fe0.4Mn0.6Si (CFMS) Heusler alloy ultrathin films with Pd, Ru, and Cr buffer layers. Perpendicular magnetization was only achieved in 0.6 and 0.8 nm-thick CFMS ultrathin films deposited on Pd buffer layer and annealed at 400 °C. At the optimum annealing temperature of 400 °C, KS of 1.2 erg/cm2 was obtained for the Pd buffer layer, which was 3-6 times larger than those for Ru and Cr buffer layers. The difference in KS probably originates from the interdiffusion and different crystallized compounds at the interface between Pd (Ru, Cr) and CFMS layers.

AB - Buffer-layer dependences of dead-layer thickness, saturation magnetization (Ms), and interface magnetic anisotropy (Ks) were systematically investigated for Co2Fe0.4Mn0.6Si (CFMS) Heusler alloy ultrathin films with Pd, Ru, and Cr buffer layers. Perpendicular magnetization was only achieved in 0.6 and 0.8 nm-thick CFMS ultrathin films deposited on Pd buffer layer and annealed at 400 °C. At the optimum annealing temperature of 400 °C, KS of 1.2 erg/cm2 was obtained for the Pd buffer layer, which was 3-6 times larger than those for Ru and Cr buffer layers. The difference in KS probably originates from the interdiffusion and different crystallized compounds at the interface between Pd (Ru, Cr) and CFMS layers.

KW - Heusler alloy

KW - interface anisotropy

KW - perpendicular magnetic anisotropy (PMA)

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