Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Surface or Interface Magnetism
O 14.2: Vortrag
Montag, 25. Februar 2008, 15:30–15:45, MA 043
Spin-resolved photoemission from antiferromagnets: Cr films on Fe(110) — •Peter Bose1, Peter Zahn1, Jürgen Henk2, and Ingrid Mertig1 — 1Martin Luther University Halle-Wittenberg, Halle, Germany — 2Max Planck Institute of Microstructure Physics, Halle, Germany
Layer-wise antiferromagnetic films grown on ferromagnets are well-suited systems for investigating exchange coupling, especially for studying exchange bias. Mn and Cr films have a profound effect on the spin-dependent transport in magnetic tunnel junctions, leading in particular to magnetoresistance oscillations with a period of 2 ML (e. g. [1]). Another recent example are 2-ML oscillations of the spin polarization in spin- and angle-resolved photoemission from Cr films on Fe(110) [2].
To understand the origin of the oscillations in Cr/Fe(110) we performed first-principles relativistic electronic structure and photoemission calculations. In particular the Cr-thickness dependence of the spin polarization at normal emission will be addressed and compared with experiment [2]. Further, magnetic linear dichroism will be discussed.
[1] P. Bose, I. Mertig, J. Henk, Phys. Rev. B 75 (2007) 100402(R).
[2] Yu. S. Dedkov, Eur. Phys. J. B 57 (2007) 15.