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
Citations
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Structure and magnetic properties of Fe-Co alloy nanoparticles synthesized by pulsed-laser inert gas condensation
TL;DR: In this paper, the authors demonstrate that pulsed-laser inert gas condensation allows to prepare high-quality nanoalloys with tailorable magnetic properties, overcoming the limitations of thermal evaporation methods with respect to compositional control.
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Uniaxial magnetic anisotropy of tetragonal FeCoV and FeCoVC films
TL;DR: In this article, the tetragonal crystalline structure and magnetic properties of MgO/Rh/(Fe1−x Co x )0.9V0.05C0.5 films (0.4 x 0.7, thickness t = 2-50 nm) were studied.
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Hard Magnetic Properties of Co-Rich Microwires Crystallized by Current Annealing
S.A. Evstigneeva,M.G. Nematov,Alexander Omelyanchik,Nikolai A. Yudanov,Valeria Rodionova,Larissa V. Panina +5 more
TL;DR: In this paper, the authors present a technique for the fabrication of hard magnetic microwires via controlled heat treatment of amorphous microwires using an electrical current. But this method requires a large increase in coercivity (up to 580 Oe).
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First-principles prediction of magnetic properties in Fe(Co,Ni)(C,N)0.5 alloys
Yohei Kota,Akimasa Sakuma +1 more
TL;DR: In this article , the effects of the light elements (C,N) addition on the magnetic properties in FeCo and FeNi ordered alloys were examined using first-principles calculations.
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Structure and magnetic properties of Fe-Co alloy nanoparticles synthesized by pulsed-laser inert gas condensation
TL;DR: In this paper , the authors used pulsed-laser inert gas condensation, consisting in laser ablation of Fe-Co alloy targets under helium atmosphere, to obtain high-quality nanoalloys with tailorable magnetic properties.
References
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