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MA: Fachverband Magnetismus

MA 28: Surface Magnetism

MA 28.6: Vortrag

Donnerstag, 29. März 2007, 16:30–16:45, H23

Strong Even-Odd Effects in Non-collinear Magnetism of Nanochains — •Samir Lounis, Peter Dederichs, and Stefan Blügel — IFF, Forschungszentrum Jülich, D-52425 Jülich, Germany

Parity of number of adatoms in finite antiferromagnetic nanowires is shown to be crucial in predicting whether the magnetic ground state is non-collinear or collinear. Using the full-potential Korringa-Kohn-Rostoker method for non-collinear magnetism [1, 2, 3] and a Heisenberg model we show that nanochains with an even number of adatoms are always magnetically non-collinear while an odd number of adatoms leads under given conditions to a collinear ferrimagnetic ground state. Very large chains are predicted to be always non-collinear independently from the parity.
[1] S. Lounis, Ph. Mavropoulos, P. H. Dederichs, S. Blügel, Phys. Rev. B 72, 224437 (2005).

[2] S. Lounis, M. Reif, Ph. Mavropoulos, L. Glaser, P. H. Dederichs, M. Martins, S. Blügel and W. Wurth, submitted to Phys. Rev. Lett., cond-mat/0608048.

[3] S. Lounis, Ph. Mavropoulos, R. Zeller, P. H. Dederichs and S. Blügel, submitted to Phys. Rev. B, cond-mat/0608481.