Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 25: Surface Magnetism / Magnetic Imaging I

MA 25.2: Vortrag

Donnerstag, 25. März 2010, 10:30–10:45, H23

Ferromagnetic versus antiferromagnetic tips for magnetic exchange force microscopy — •Cesar Lazo and Stefan Heinze — Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany.

Magnetic exchange force microscopy (MExFM) is a promising new technique to perform magnetic imaging with atomic resolution by measuring the magnetic exchange force between a magnetically coated tip and a magnetic sample [1]. Here, we apply density functional theory using the full-potential linearized augmented plane wave (FP-LAPW) method to simulate MExFM on the antiferromagnetic monolayer Fe on W(001) [2]. We use single atom tips of Cr, Mn and Fe, and multi-atom tips of Cr and Fe as models. For single atom tips, we find a magnetic exchange interaction which resembles the Bethe-Slater curve. Using multi-atoms tips, we observe that relaxations of the cluster and the surface are significant and larger for Cr tips than for Fe tips. In conclusion, Cr tips exhibit a higher magnetic exchange force than Fe tips and are well suited for MExFM experiments.

[1] U. Kaiser et al., Nature 446, 522 (2007)

[2] R. Schmidt, C. Lazo. et al., Nano Lett. 9, 200 (2009)