Magnetic and vibration excitations induced by collision in ferromagnetic cluster

Abstract.

We investigate the excitations induced by 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. The repulsion between the nucleus has a Born-Meyer form. Our calculation includes both a real time description of the spins of the two interacting systems and also the atomic motion of the cluster atoms. The spin excitations induced are studied versus the cluster size and the trajectory conditions. The effects of the phonons on the spin excitations will be discussed. The collision transfer energy between the target and the projectile presents some resonances versus the velocity of the projectile. The nonadiabatic behaviour during the collision has been characterized by the spin temperature at the end of the the collision.