Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 14: Bio- and Molecular Magnetism

MA 14.8: Vortrag

Dienstag, 1. April 2014, 11:30–11:45, HSZ 401

Magnetization curves of deposited spin clusters — •Henning-Timm Langwald and Jürgen Schnack — Bielefeld University, Bielefeld, Germany

For future technological applications deposited magnetic clusters offer a significant potential. To utilize this potential requires to characterize these clusters while they are in contact with a substrate. Experimentally, techniques such as spin-flip inelastic tunneling spectroscopy are very useful in this context. These techniques can be used to determine e.g. exchange parameters for effective spin models of the magnetic clusters. One possible approach here is to detect ground state level crossings in an applied magnetic field which serve as fingerprint for the aforementioned spin models.

In this talk we address antiferromagnetic spin chains on a metallic substrate theoretically. The coupling to a conduction electron band of the substrate can lead to a screening of a part of the spin chain and thus influence the crossing fields. By means of the Numerical Renormalization Group method (NRG) we investigate how the exchange coupling to the substrate's conduction electrons influences the magnetic properties and show the differences between partial and full screening of the spin closest to the substrate.