Journal ArticleDOI
Ferromagnetic Anisotropy Energies of Co Metal and Co Alloys –Band Model–
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In this paper, the ferromagnetic anisotropy energy of H. P. Co metal is calculated by the use of the energy bands of ferromagnetagnetic Co metal given by Ishida.Abstract:
The ferromagnetic anisotropy energy of H. C. P. Co metal is calculated by the use of the energy bands of ferromagnetic Co metal given by Ishida. The doubly degenerate energy levels along [0001] axis on the Brillouin zone produce the contributions to make c -axis to be the easy axis. The other doubly degenerate energy levels and the approaching energy levels produce the contributions to make c -plane to be the easy direction. It is shown that at 0 K, c -axis is the easy axis, and when the temperature is raised and the exchange splitting decreases, c -plane becomes the easy direction. The anisotropy energies of Co alloys including 1 at% of Fe and Ni metal are also calculated. The obtained results are in agreement with the experimental results.read more
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Journal ArticleDOI
Magnetic Field Dependence of the Magnetocrystalline Anisotropy Energy in hcp Co
TL;DR: In this article, the magnetic field dependences of the first and second uniaxial magnetocrystalline anisotropy constants K u1 and K u2 for hcp Co were obtained at various temperatures between 4.2 and 616 K by using the 90-points least mean square routine.
Book ChapterDOI
Chapter 1 Iron, cobalt and nickel
TL;DR: In this paper, the Stoner-Hubbard parameter I was used to determine the exchange splitting between + and − spins of three transition metals: iron, cobalt, and nickel.
Journal ArticleDOI
NMR investigation of Co magnetic anisotropy in RCo5 compounds
TL;DR: In this article, the hyperfine field anisotropy of the Co atoms at the two Co sites of R Co 5 compounds was investigated and related to the Co contribution to the magnetic anisotropic.
Journal ArticleDOI
Theory of local magnetic anisotropy in amorphous alloys
TL;DR: In this article, the local magnetic anisotropy in amorphous transition metal alloys caused by local spin-orbit coupling has been studied by a perturbation treatment on the basis of a semi-empirical self-consistent Hartree-Fock approach.
Journal ArticleDOI
Temperature Dependence of the Uniaxial Magneto-Crystalline Anisotropy Energy of Co
Fumihisa Ono,Osamu Yamada +1 more
TL;DR: In this article, the temperature dependence of K u 1 below about 200 K could well be explained with a model based on the itinerant electron theory by considering the thermal expansion of the lattice parameter ratio.
References
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Journal ArticleDOI
Energy Band Structure of Nickel
TL;DR: In this paper, the energy band structure of Nickel is investigated by the modified tight-binding approximation and the Green's function method, and the general character of the 3d-bands is quite similar to that in Cu.
Journal ArticleDOI
Band Structure of hcp Cobalt
TL;DR: In this article, an interpolation scheme for hcp transition metals is developed as an extension of Mueller's method, and the band structures of fcc and hcp Co are calculated by KKR with a suitable potential.
Journal ArticleDOI
Calculation of Ferromagnetic Anisotropy Energies for Ni and Fe Metals
TL;DR: In this article, the perturbation theory was used to calculate the anisotropy energies for Ni and Fe metals, and the spin-orbit interaction was taken into account in the tight binding approximation up to the fourth and sixth order perturbations.
Journal ArticleDOI
Tight-Binding Method for Hexagonal Close-Packed Structure
TL;DR: Tables for reduction of the matrix components of energy in the tight-binding approximation have been prepared for the hexagonal close-packed lattice as discussed by the authors, where the matrix component of energy is defined as