Regensburg 2002 – wissenschaftliches Programm

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MA: Magnetismus

MA 7: Spinabhängige Transportphänomene II

MA 7.12: Vortrag

Dienstag, 12. März 2002, 12:15–12:30, H22

A model for ferromagnetic nanograins with discrete electronic states — •Silvia Kleff and Jan von Delft — Sektion Physik und Center for NanoScience, Ludwig-Maximilians-Universität, Theresienstr.37, 80333 München

We discuss a simple phenomenological model [1-3] for an ultrasmall ferromagnetic grain, formulated in terms of the grain’s discrete energy levels. We compare the model’s predictions with recent measurements of the discrete tunneling spectrum through such a grain [3,4]. The model can qualitatively account for the observed features if we assume (i) that the anisotropy energy varies among different eigenstates of one grain, and (ii) that nonequilibrium spin accumulation occurs.

[1] S. Kleff et al., to be published in PRB (Rapid); [2] S. Kleff and J. von Delft, submitted to PRB, cond-mat/0110348; [3] M. Deshmukh, S. Kleff et al. PRL 87, 226801 (2001); [4] S. Guéron et al., PRL 83, 4148 (1999).