Magnetism of a single atom

Leiden Repository

Magnetism of a single atom

Type: Doctoral Thesis
Title: Magnetism of a single atom
Author: Otte, Alexander Ferdinand
Publisher: LION, AMC research group, Faculty of Science, Leiden University
Issue Date: 2008-03-19
Keywords: Crystal field anisotropy
Kondo resonance
Scanning tunneling spectroscopy
Spin coupling
Spin excitations
Abstract: A low-temperature scanning tunneling microscope is used to perform spin-excitations on individual magnetic transition metal atoms when placed onto a crystal surface. By following these excitations while applying external magnetic fields the precise influence of the anisotropic crystal field on the spins of iron and manganese atoms is investigated. Similar experiments on an individual cobalt atom lead to the observation of a Kondo resonance. This can be explained by showing that the crystal field reduces the 3/2 spin state to an effective spin-1/2 Kramers doublet. The influence of the local environment (i.e. magnetic field, crystal field anisotropy and spin-coupling to neighboring atoms) on the characteristics of the Kondo resonance is studied.
Description: Promotor: J.M. van Ruitenbeek, Co-promotor: A.J. Heinrich
With summary in Dutch
Faculty: Faculteit der Wiskunde en Natuurwetenschappen
Citation: Otte, A.F., 2008, Doctoral thesis, Leiden University
Series/Report no.: Casimir PhD Series : 2008-01
ISBN: 9789085930396

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