Shape functions of dipolar ferromagnets at the Curie point

SHAPE FUNCTIONS OF DIPOLAR FERROMAGNETS AT THE CURIE POINT E. FREY, F. SCHWABL and S. THOMA

An increasing quantitative understanding of the critical dynamics of isotropic ferromagnets such as EuO, EuS and Fe above T~has been achieved recently by taking into account the long range dipolar interaction, which is present in all real ferromagnets. The results of various experimental methods [1—11] (neutron scattering, electron spin resonance and hyperfine interaction), sampling different r...

00 2 Plasticity of Ferromagnets near the Curie Point

We propose an explanation of the anomalous growth of plasticity in ferromagnets near the Curie point. We demonstrate that this effect is caused by spin-dependent detachment of dislocations from obstacles under an influence of the internal magnetic field. Magnetization fluctuations grow in the vicinity of the Curie point, yield an increase of the detachment probability and, hence, an increase of...

Oscillatory curie temperature of two-dimensional ferromagnets.

The effective exchange interactions of magnetic overlayers Fe/Cu(001) and Co/Cu(001) covered by a Cu-cap layer of varying thickness were calculated in real space from first principles. The effective two-dimensional Heisenberg Hamiltonian was constructed and used to estimate magnon dispersion laws, spin-wave stiffness constants, and overlayer Curie temperatures within the mean-field and random-p...

Critical Dynamics of Dipolar Ferromagnets

The dynamics of isotropic ferromagnets as EuO, EuS and Fe has been in focusever since the very beginnings ofthe field of critical dynamics. Despite the largeamount of experimental [1—6]and theoretical investigations [7,8], there remain importantopen problemswhich havenot been resolved up to now. (i) The expected crossover from isotropic to dipolar critical behaviour, accompanied by a change of ...

Dipolar ferromagnets and glasses (invited)