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Room temperature magnetic stabilization of buried cobalt nanoclusters within a ferromagnetic matrix studied by soft x-ray magnetic circular dichroism

Hindmarch, A.T. and Dempsey, K.J. and Morgan, J.P. and Hickey, B.J. and Arena, D.A. and Marrows, C.H. (2008) 'Room temperature magnetic stabilization of buried cobalt nanoclusters within a ferromagnetic matrix studied by soft x-ray magnetic circular dichroism.', Applied Physics Letters, 93 (17). p. 172511.

Abstract

Single dusting layers of size-selected Co nanoclusters (NCs) of sizes ranging from 1.5–5.5 nm have been deposited by a gas-phase aggregation method in ultrahigh vacuum, and embedded within a NiFe matrix. Magnetic hysteresis loops have been obtained using soft x-ray magnetic circular dichroism, which shows that these Co NCs embedded in NiFe exhibit room temperature ferromagnetism with identical coercivity to the surrounding NiFe film. The strong local exchange field at the interface between NiFe and Co NCs, combined with the magnetic anisotropy of the NiFe film, allows stabilization of NC ferromagnetism which persists to room temperature.

Item Type:Article
Keywords:Cobalt, Coercive force, Ferromagnetic materials, Magnetic circular dichroism, Magnetic hysteresis, Nanostructured materials, Permalloy.
Full text:PDF - Published Version (517Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1063/1.3012368
Publisher statement:Copyright (2008) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Hindmarch, A.T. and Dempsey, K.J. and Morgan, J.P. and Hickey, B.J. and Arena, D.A. and Marrows, C.H. (2008) 'Room temperature magnetic stabilization of buried cobalt nanoclusters within a ferromagnetic matrix studied by soft x-ray magnetic circular dichroism.', Applied Physics Letters, 93 (17). p. 172511 and may be found at http://dx.doi.org/10.1063/1.3012368
Record Created:08 Aug 2012 12:05
Last Modified:15 Aug 2012 09:20

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