Conversion of FeCo from soft to hard magnetic material by lattice engineering and nanopatterning
Takashi Hasegawa,Shunsuke Kanatani,Miyu Kazaana,Kairi Takahashi,Kohei Kumagai,Maiko Hirao,Shunji Ishio +6 more
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TLDR
The hard magnetic properties and magnetic domain structures of nanopatterned FeCo alloy thin films are experimentally investigated and a relatively large value of the perpendicular uniaxial magnetic anisotropy Ku = 2.1 × 106 J·m−3 was obtained, while the Hc of the nanopatting FeCo layers increased with decreasing dot pattern size.Abstract:
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 × 106 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 × 105 A·m−1, and the corresponding value of μ
0
H
c was 0.60 T, where μ
0 represented the vacuum permeability.read more
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References
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TL;DR: In this article, a strong uniaxial anisotropy and an easy-magnetization axis perpendicular to the film plane are observed for tetragonally distorted alloy films.
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