Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 26: Electron Theory

MA 26.2: Vortrag

Donnerstag, 30. März 2006, 10:30–10:45, HSZ 401

Orbital magnetism of Co impurities in Au — •Mahdi Sargolzaei, Ingo Opahle, Manuel Richter, Klaus Koepernik, Ulrike Nitzsche, and Helmut Eschrig — IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany

The electronic structure of cobalt impurities inside gold has been calculated in the framework of local spin density approximation including two dufferent variants of orbital polarization corrections [1,2]. Orbital and spin magnetic moments have been evaluated using the relativistic version of the full-potential local-orbital minimum-basis code. In agreement with recent experimental and theoretical findings, the orbital moment is considerably enhanced in comparison with Co metal. It is demonstrated that lattice relaxation around the impurities reduces the orbital moment by about 15%. Co in Au is also an example for systems with high anisotropy energy and large orbital moment which compared to hcp Co are one order of magnitude larger.

1- O. Eriksson, B. Johansson, M. S. S. Brooks, J. Phys. Cond. Mat. 1, 4005 (1989).

2- H. Eschrig, M. Sargolzaei, K. Koepernik, M. Richter, Europhys. Lett. 72, 611 (2005).