Orbital magnetic moments and magnetic anisotropy energy in RhN and CoNPdM clusters

R. Guirado-López; P. Villaseñor-González; J. Dorantes-Dávila; G. M. Pastor

doi:10.1140/epjd/e2003-00129-2

EPJ

a
b
c
d
e
ap
st
h
plus
ds
pv
ti
qt
am
n

2024 Impact factor 1.5

Atomic, Molecular, Optical and Plasma Physics

Eur. Phys. J. D 24, 73-76 (2003)
https://doi.org/10.1140/epjd/e2003-00129-2

Orbital magnetic moments and magnetic anisotropy energy in Rh_N and Co_NPd_M clusters

R. Guirado-López¹, P. Villaseñor-González¹, J. Dorantes-Dávila¹^,2 and G. M. Pastor²^a

¹ Instituto de Física, Universidad Autónoma de San Luis Potosí, San Luis Potosí, Mexico
² Laboratoire de Physique Quantique (UMR 5626 du CNRS) , Université Paul Sabatier, 31062 Toulouse Cedex, France

Corresponding author: ^a gustavo.pastor@irsamc.ups-tlse.fr

Received: 10 September 2002
Published online: 3 July 2003

Abstract

The orbital magnetic moments $\langle L\rangle$ and the magnetic anisotropy energy (MAE) of Rh_N ( $N\le 55$ ) and Co₁₉Pd_M (M=24 and 60) are determined by using a self-consistent real-space tight-binding method. For Rh_N, $\langle L\rangle$ amounts typically 20–50% of the total magnetic moment $M_z=2 \langle S_z \rangle$ + $\langle L_z\rangle$ . Strong oscillations as a function of N are observed with a rapid convergence to zero as the spin magnetization vanishes for $N\simeq 40$ –50. In Co₁₉Pd_M clusters, the magnetization per Co atom is remarkably larger than in pure Co₁₉. This is mainly due to the local spin moments $\langle S_{iz}\rangle$ induced at the Pd atoms, which amount to about 20% of the spin moment per Co atom [ $2\langle S_{iz}\rangle_{\rm Pd} = (0.1$ – $0.3) \mu_{\rm B}$ ] . Large orbital moments are found at the Co atoms, particularly at the Co/Pd interface. The anisotropy of $\langle L\rangle$ and the associated MAE's are analyzed from a local perspective.