Conversion of FeCo from soft to hard magnetic material by lattice engineering and nanopatterning

The development of magnetic materials with large uniaxial magnetic anisotropy ( K u ) and high saturation magnetization has attracted much attention in various areas such as high-density magnetic storage, spintronic devices, and permanent magnets. Although FeCo alloys with the body-centred cubic str...

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Bibliographic Details
Published in:Scientific reports 2017-10, Vol.7 (1), p.13215-7, Article 13215
Main Authors: Hasegawa, Takashi, Kanatani, Shunsuke, Kazaana, Miyu, Takahashi, Kairi, Kumagai, Kohei, Hirao, Maiko, Ishio, Shunji
Format: Article
Language:English
Subjects:
142/126
639/301/357/997
639/925/357/997
Alloys
Anisotropy
Humanities and Social Sciences
Magnetic properties
Magnetism
multidisciplinary
Nanopatterning
Permeability
Science
Science (multidisciplinary)
Thin films
Vacuum
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Summary:The development of magnetic materials with large uniaxial magnetic anisotropy ( K u ) and high saturation magnetization has attracted much attention in various areas such as high-density magnetic storage, spintronic devices, and permanent magnets. Although FeCo alloys with the body-centred cubic structure exhibit the highest M s among all transition metal alloys, their low K u and coercivity ( H c ) make them unsuitable for these applications. However, recent first-principles calculations have predicted large K u for the FeCo films with the body-centred tetragonal structure. In this work, we experimentally investigated the hard magnetic properties and magnetic domain structures of nanopatterned FeCo alloy thin films. As a result, a relatively large value of the perpendicular uniaxial magnetic anisotropy K u  = 2.1 × 10 6  J·m −3 was obtained, while the H c of the nanopatterned FeCo layers increased with decreasing dot pattern size. The maximum H c measured in this study was 4.8 × 10 5  A·m −1 , and the corresponding value of μ 0 H c was 0.60 T, where μ 0 represented the vacuum permeability.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-017-13602-x