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
Reads0
Chats0
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
More filters
Journal ArticleDOI
Current progress and future challenges in rare-earth-free permanent magnets
Jun Cui,Jun Cui,Matthew J. Kramer,Matthew J. Kramer,Lin Zhou,Fei Liu,Alexander Gabay,George C. Hadjipanayis,Balamurugan Balasubramanian,David J. Sellmyer +9 more
TL;DR: In this paper, the authors review the science and technology of various types of non-RE materials for permanent magnet applications and discuss the current status, challenges, potentials, and future directions for these candidates.
Journal ArticleDOI
A mechanically strong and ductile soft magnet with extremely low coercivity
Liuliu Han,Fernando Maccari,I.R. Souza Filho,Nicolas J. Peter,Ye Wei,Baptiste Gault,Oliver Gutfleisch,Zhimin Liu,Dierk Raabe +8 more
TL;DR: In this article , a FeCoNiTa-Al multicomponent alloy (MCA) with paramagnetic coherent nanoparticles was designed to impede dislocation motion, enhancing strength and ductility.
Journal ArticleDOI
Hard and semi-hard magnetic materials based on cobalt and cobalt alloys
TL;DR: An overview of the development of Co-based hard and semi-hard magnetic materials and their intrinsic and extrinsic magnetic properties in view of fundamental understanding and technological applications can be found in this paper.
Journal ArticleDOI
Prospect and status of iron-based rare-earth-free permanent magnetic materials
TL;DR: In this paper, the prospect and status of developments of iron-based RE-free hard-magnetic nanomaterials involving magnetic thin films, nanocomposites and nanostructures are discussed.
References
More filters
Journal ArticleDOI
Magnetic anisotropy energy of disordered tetragonal Fe-Co systems from ab initio alloy theory
TL;DR: In this paper, the authors present results of systematic fully relativistic first-principles calculations of the uniaxial magnetic anisotropy energy (MAE) of a disordered and partially ordered tetragonal Fe-Co alloy using the coherent potential approximation (CPA).
Book
Phase equilibria in iron ternary alloys : a critical assessment of the experimental literature
G. V. Raynor,V. G. Rivlin +1 more
TL;DR: In this article, the authors present 39 Fe X-Y systems, originally published by ASM and The Institute of Materials in the International Metals Reviews, now updated and presented in a comprehensive collection.
Journal ArticleDOI
Tuning the perpendicular magnetic anisotropy in tetragonally distorted FexCo1−x alloy films on Rh (001) by varying the alloy composition
TL;DR: In this paper, tetragonally distorted FexCo1−x alloy films are grown on Rh (001) showing a strong perpendicular magnetic anisotropy in a wide thickness and composition range.
Journal ArticleDOI
Mechanism of uniaxial magnetocrystalline anisotropy in transition metal alloys
TL;DR: In this paper, the authors systematically describe the mechanism of uniaxial magnetocrystalline anisotropy in real materials and present the conditions under which the anisotropic energy can be increased.
Journal ArticleDOI
Increased magnetocrystalline anisotropy in epitaxial Fe-Co-C thin films with spontaneous strain
Ludwig Reichel,G. Giannopoulos,Sandra Kauffmann-Weiss,Martin Hoffmann,Darius Pohl,Alexander Edström,Steffen Oswald,D. Niarchos,Jan Rusz,Ludwig Schultz,Sebastian Fähler +10 more
TL;DR: In this paper, it was shown that the applied strain quickly relaxes with increasing film thickness and hampers stabilization of a strong magnetocrystalline anisotropy, leading to the formation of a spontaneously strained phase with 3% tetragonal distortion.
Related Papers (5)
Giant magnetic anisotropy in tetragonal FeCo alloys.
Soft magnetic FeCo alloys: alloy development, processing, and properties
R. S. Sundar,Seetharama C. Deevi +1 more