Local structure and magnetism of L10-type FeNi alloy films with perpendicular magnetic anisotropy studied through 57Fe nuclear probes. (29th May 2015)

• Record Type: Journal Article
• Authors: Mibu, K; Kojima, T; Mizuguchi, M; Takanashi, K
• Is Part Of: Journal of physics. Volume 48:Number 20(2015)
• Page Start: 2350
• Publication Date: 2015-05-29
• Subjects: Physics -- Periodicals; 530
• DOI: 10.1088/0022-3727/48/20/205002
• Languages: English
• ISSNs: 0022-3727

Abstract

<abstract> <title>Abstract</title> <p>The local structure and magnetism of FeNi alloy films prepared by alternate deposition of Fe and Ni monatomic layers, where perpendicular magnetic anisotropy has been observed, were investigated through ⁵⁷Fe nuclear probes using Mössbauer spectroscopy. It was confirmed that the films are composed of L1₀-type ordered FeNi phase and A1-type disordered FeNi phase. For the films grown at 40–70 °C, which have no perpendicular anisotropy, the A1-disordered phase is dominant, whereas for the films grown at 100–190 °C, which have a stronger perpendicular anisotropy, the relative amount of the L1₀-ordered phase reaches 40% or more. It was clearly shown that the magnetic anisotropy of these films is strongly correlated with the local environments of Fe in the films. The results imply that if a further increase in the ratio of the L1₀-ordered phase is successfully achieved, one would obtain films with a stronger magnetic anisotropy applicable to perpendicular magnetic recording.</p> </abstract>