B. Lazarovits, L. Szunyogh, P. Weinberger:

"Magnetic properties of finite Co chains on Pt(111)";

Bull. Am. Phys. Soc.,48(2003), 397.

We present first principles calculations of the magnetic moments and magnetic anisotropy energies of finite monoatomic

Co_n (1\leq n\leq 10) chains deposited along the (110) direction on top of a fcc Pt(111) surface. The calculations were

performed fully relativistically using the embedded cluster technique within the Korringa--Kohn--Rostoker method. The

magnetic anisotropy energy was evaluated by means of the magnetic force theorem. As a direct consequence of the reduced

coordination number of the Co atoms, as compared to a Co overlayer on Pt (111) we found enhanced spin- and orbital moments

as well as enhanced anisotropy energies in the Co chains. For the Pt atoms adjacent to the Co atoms, however, we obtained

induced magnetic moments smaller than in the case of a Co monolayer on Pt(111). The moments and the contributions of the

individual atoms to the magnetic anisotropy energy depend characteristically on the position within the chains, i.e., on the

local environment of the individual atoms. Independent of the length of the chains we found that the easy axis is

perpendicular to the surface, i.e., in direction of the chain. The size of the calculated magnetic anisotropy energy and of the

anisotropy of the orbital moment fits very well to available experimental values for monoatomic Co chains deposited on a

Pt(997) surface.

http://www.aps.org/meet/MAR03/baps/abs/S2690006.html

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