J. Kociński

Critical magnetic moment diffusion in ferromagnets.

Abstract An elementary derivation of the diffusion and entropy production equations is given and the assumption on which conventional theory of the diffusion coefficient is based is criticized.

The dependence of critical scattering on crystal lattice structure

Abstract Critical scattering in monocrystals undergoing second order phase transition in particular in ferroelectrics is shown to depend on the lattice structure.

Temperature shift of the maximum of critically scattered neutrons in ferromagnets

Abstract The temperature shift of the maximum of critically scattered neutrons has been discussed in terms of the ∥sin κ 2 r ∥/ r spin correlation.

Correlation of spins in ferromagnets in the immediate vicinity of the Curie point

Abstract The decisive role of the non-linear terms in the equation for the spin correlation function for temperatures close to the Curie point has been demonstrated.

Critical scattering cross section in ferromagnetic polycrystals

Abstract The average over the directions of the crystalline axes in the cross section for a monocrystal, obtained with the non-spherical correlation, leads to the experimentally established cross section for small as well as for large scattering vectors.

Critical magnetic scattering of neutrons and the |sinκ2r|/r spin correlation

Abstract Experimental data on critical magnetic scattering of neutrons are explained in terms of the |sin κ 2 r |/ r spin correlation, and the possibility of detection of the predicted diffraction minima is pointed out.

The static generalized susceptibility for a ferromagnet in the critical region

Abstract A method of calculating the static generalized susceptibility for the critical region in the constant coupling approximation has been formulated and applied to ferromagnets above the Curie point, leading to an anisotropic susceptibility.

The Brillouin-Mandelstam doublet in the critical magnetic scattering of neutrons

Abstract We give a unified description of scattered light, X-rays or neutrons in the critical region and print out the adiabatic character of the magnetisation waves leading to the Brillouin-Mandelstam doublet.

On the decay of temperature and magnetic moment fluctuations

Abstract It has been pointed out, that near the Curie point and above it the length of the decay time of a fluctuation in the crystal lattice temperature of iron is close to that of a fluctuation in the magnetic moment.

Brownian motion and diffusion of spins

Abstract An analogy has been drawn between the description of particle diffusion in gases or liquids and spin diffusion in ferromagnets.