Thermodynamics of itinerant magnets in a classical spin-fluctuation model

Thermodynamics of Itinerant Magnets in a Classical Spin-Fluctuation Model

Spin Excitations in Localized and Itinerant Magnets

Collective excitations in magnetic materials can be investigated by means of inelastic neutron scattering. We show that this experimental method gives access to the complete spectrum of magnetic fluctuations through the energyand momentum-dependence of the dynamical susceptibility. We focus on the dynamical properties of magnets with localized spin densities and of metals. From such studies, mi...

Spin-Fluctuation Mechanism of Anomalous Temperature Dependence of Magnetocrystalline Anisotropy in Itinerant Magnets.

The origins of the anomalous temperature dependence of magnetocrystalline anisotropy in (Fe_{1-x}Co_{x})_{2}B alloys are elucidated using first-principles calculations within the disordered local moment model. Excellent agreement with experimental data is obtained. The anomalies are associated with the changes in band occupations due to Stoner-like band shifts and with the selective suppression...

Spin conductance, dynamic spin stiffness and spin diffusion in itinerant magnets

We discuss analogies between the chargeand spin response functions of itinerant magnets. We show that the spin-analog of the charge stiffness is not given by the usual spin stiffness ρs, but by the dynamic spin stiffness Ds, which is obtained from the dynamic spin conductance Gs(ω) in the limit of vanishing frequency ω. The low-frequency behavior of Gs(ω) is used to define ideal spin conductors...

Orbital polarization in itinerant magnets.

We propose a parameter-free scheme of calculation of the orbital polarization (OP) in metals, which starts with the strong-coupling limit for the screened Coulomb interactions in the random-phase approximation (RPA). For itinerant magnets, RPA can be further improved by restoring the spin polarization of the local-spin-density approximation through the local-field corrections. The OP is then co...