I. Reichl, A. Vernes, P. Weinberger, L. Szunyogh, C. Sommers:

"Reorientation transition in Fe";_{n}/Au(100)

Physical Review B,71(2005), 214416-1 - 214416-5.

Experimental investigations and theoretical magnetic anisotropy energy calculations show a reorientation

transition of the magnetization in Fen/Aus100d from a normal-to-plane to an in-plane direction at about three

monolayers of Fe. In the present paper the magneto-optical properties of this system are investigated theoretically

by using the spin-polarized relativistic screened Korringa-Kohn-Rostoker method, the Kubo-Greenwood

equation for finite photon frequencies, and a classical optical approach that takes into account all reflections

and interferences. By varying the thickness of the Fe film, the reorientation of the ground-state magnetization

is clearly traced as a strong decrease in the calculated Kerr rotation angles for oblique incidence of light. For

all film thicknesses under consideration, it is found that by continuously varying the angle of the incident light

the Kerr rotation angle reaches a maximum at an incidence of about 70°. In the case of normal incidence a

direct proportionality of the Kerr angles to the normal component of the magnetization is demonstrated by

changing the orientation of the magnetization. When relating Kerr angles as calculated for a set of angles

between the surface normal and the orientation of the magnetization to the corresponding magnetic anisotropy

energy a very compact description of the occurring reorientation transition can be given. Moreover, based on

these data and using a simple phenomenological picture a qualitative description of the Kerr angles with

respect to applied external fields is provided.

DOI: 10.1103/PhysRevB.71.214416 PACS numberssd: 77.22.Ch, 78.20.Bh, 78.20.Ci, 78.20.Ls

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