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Lecture C. Binns


11 May 2004 FWN-Building 5118.-152, Nijenborgh 4, 9747 AG, Groningen
Speaker: Prof. C. Binns
Affiliation: Department of Physics and Astronomy, University of Leicester, UK
Title: Building high-performance magnetic materials out of gas-phase nanoclusters
Date: Tue May 11, 2004
Start: 11.00
Location: FWN-Building 5118.-152
Host: G. Palasantzas
Telephone: +31 50 363 4272


It is well known that free magnetic nanoclusters display novel properties including enhanced magnetic moments in ferromagnetic metals and the appearance of magnetism in non-magnetic metals. A challenge is to build the intrinsic novel behaviour into macroscopic materials. The talk will present the magnetic behaviour of isolated nanoclusters deposited onto magnetic and non-magnetic substrates and how cluster-cluster interactions modify this behaviour. Mass-selected Fe clusters in the size range 180-700 atoms adsorbed on HOPG substrates and exposed in UHV show that the supported particles maintain an enhanced magnetic moment relative to bulk Fe with a significant contribution coming from the orbital moment. Coating the exposed clusters with Co increases the spin moment still further without significantly reducing the orbital component giving total moments comparable with free cluster values. Thick cluster films are shown to adopt a domainless correlated super-spin glass magnetic configuration that is very soft magnetically. Measurements of the switching dynamics in cluster-assembled films show a faster response than a conventional thin film.
Last modified:22 October 2012 2.31 p.m.