AVS 46th International Symposium
    Magnetic Interfaces and Nanostructures Technical Group Thursday Sessions
       Session MI+NS-ThM

Paper MI+NS-ThM9
Magnetic Properties of Iron Clusters Deposited on Graphite

Thursday, October 28, 1999, 11:00 am, Room 618/619

Session: Patterned or Self-Assembled Magnetic Nanostructures
Presenter: A. Rosén, Göteborg University, Sweden
Authors: A. Rosén, Göteborg University, Sweden
M. Andersson, Göteborg University, Sweden
M. Hansson, Chalmers University of Technology, Sweden
R. Wäppling, Uppsala University, Sweden
B. Kalska, Uppsala University, Sweden
N. Tarras-Wahlberg, Göteborg University, Sweden
C. Johansson, Chalmers University of Technology, Sweden
Correspondent: Click to Email
Magnetic properties of iron clusters deposited on graphite Iron clusters with a wide size distribution were produced in a laser vaporisation source and deposited on a graphite substrate. The magnetic relaxation of the clusters was studied with Mössbauer spectroscopy. At 300 K the sample was dominated by fast superparamagnetic behaviour, whereas the relaxation slowed down at lower temperature and six-peak components, representative for static or near-static spinconfigurations, dominated the Mössbauer spectra at 5 K. This indicates that the sample consists of mono-domain particles having an average size between 5 and 10 nm. From the hysteresis loops we obtained that the saturation magnetization was in the range of bulk a -iron and that the coercivity and the remanence increase with decreasing temperature in the whole temperature range. This behaviour is typical for a system of mono-domain particles with a wide size distribution.