Journal ArticleDOI
Single-Site Functional-Integral Approach to Itinerant-Electron Ferromagnetism
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In this paper, a functional-integral method with two fields within the static and saddle-point approximations combined with the single-site approximation was used to analyze the ferromagnetic properties of bcc transition metals.Abstract:
Itinerant-electron ferromagnetism at finite temperatures is discussed by using the functional-integral method with two fields within the static and saddle-point approximations combined with the single-site approximation; a single atom of a pure metal is regarded as an impurity embedded in the host which is treated by a kind of the alloy-analogy approximation. The amplitude of the local magnetic moment is shown to have a weak temperature dependence and to remain finite even in the paramagnetic state, where the spin susceptibility obeys an approximate Curie-Weiss law. Numerical calculations are made with the use of a simplified model for the density of states of bcc transition metals. Calculated results are discussed with reference to experimental data of iron.read more
Citations
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A first-principles theory of ferromagnetic phase transitions in metals
TL;DR: In this paper, a mean-field theory of magnetic phase transitions in metals was developed based on a spin-polarised density functional description of the electrons, and the average of the electronic grand potential averaged over various ensembles of such'spin' configurations.
Journal ArticleDOI
Spin polarized tunneling in ferromagnetic junctions
TL;DR: In this paper, the authors review the experimental results and the current theoretical understanding of spin tunneling: its dependence on bias, temperature and barrier characteristics, and the influence of inelastic tunneling processes, metal at the interface and material properties on the JMR.
Journal ArticleDOI
Recent progress in the theory of itinerant electron magnetism
TL;DR: A review of recent theoretical investigations toward unified understanding of magnetism in narrow-band electron systems is given in this article, where the classical controversy between the itinerant and localized models have been resolved into a more general and well-defined problem of spin density fluctuations in a general sense.
Journal ArticleDOI
Spin-tunneling in ferromagnetic junctions
TL;DR: In this article, the authors reviewed the experimental results and the current theoretical understanding of FM-I-FM tunneling and its dependence on bias, temperature, and barrier characteristics, and the influence of inelastic tunneling processes and material properties on the junction magnetoresistance.
Journal ArticleDOI
The “disordered local moment” picture of itinerant magnetism at finite temperatures
TL;DR: In this paper, the authors discuss the "disordered local moment" (DLM) picture of metallic magnetism and derive a spin density functional approach based on the spin Density Functional Approach.
References
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Journal ArticleDOI
Localized Magnetic States in Metals
TL;DR: In this article, the conditions necessary in metals for the presence or absence of localized moments on solute ions containing inner shell electrons are analyzed, and a self-consistent Hartree-Fock treatment is applied to show that there is a sharp transition between the magnetic state and the nonmagnetic state, depending on the density of states of free electrons, the $s\ensuremath{-}d$ admixture matrix elements, and the Coulomb correlation integral in the $d$ shell.
Journal ArticleDOI
Coherent-Potential Model of Substitutional Disordered Alloys
TL;DR: In this paper, a substitutional alloy based on the concept of an effective or coherent potential was introduced, which, when placed on every site of the alloy lattice, will simulate the electronic properties of the actual alloy.
Journal ArticleDOI
Modèle de fonction aléatoire de couverture applicable aux phénomènes de filiation à base poissonnienne
TL;DR: In this article, a modele statistique applicable aux phenomenes de filiation radioactive a plusieurs etages is presented, i.e., un modele statisticique applicable to a phenomene global, in fonction des differentes lois des retards aleatoires introduits par le phenomeme de filiations.
Journal ArticleDOI
The Magnetization of Pure Iron and Nickel
J. Crangle,G. M. Goodman +1 more
TL;DR: In this paper, the saturation magnetization of very pure iron and nickel has been measured absolutely by a force method at room temperature, and the values are 217.6 and 55.1 emu/g (217.6 −1 kg −1 ) respectively.
Journal ArticleDOI
The effective Curie-Weiss constant of ferromagnetic metals and alloys
P. Rhodes,E. P. Wohlfarth +1 more
TL;DR: In this article, the Curie-Weiss constant and the saturation magnetization of a wide variety of ferromagnetic substances are used to calculate respective values for the numbers of magnetic carriers, q$\_c$ and q$ \_s$.