Eur. Phys. J. D 24, 165-168 (2003)
https://doi.org/10.1140/epjd/e2003-00143-4

Real time evolution in spin diffusion on magnetic cluster

¹ Faculté des Sciences, Département de Physique, Université d'Annaba, B.P. 12, Annaba, Algeria
² Laboratoire de Physique des Solides, bâtiment 510, Université d'Orsay, 91405 Orsay Cedex, France

Corresponding author: ^a tarento@lps.u-psud.fr

Received: 10 September 2002
Published online: 3 July 2003

Abstract

We investigate the diffusion of a spin polarized projectile on a ferromagnetic spin polarized cluster. The interaction between the projectile and the target is described with a Heisenberg Hamiltonian which excludes the charge degree of freedom during the process. Our calculation is based on a real time description of the spins of the two interacting systems. We deduce from it the depolarization cross-section of the projectile and the excitation in the cluster versus its size, the impact parameter and the kinetic energy. We analyze 3 different behaviors of the system according to whether the intra-cluster excitations propagate slower or faster than the projectile.