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

Hindmarch, A.T.; Dempsey, K.J.; Morgan, J.P.; Hickey, B.J.; Arena, D.A.; Marrows, C.H.

doi:10.1063/1.3012368

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

Hindmarch, A.T.; Dempsey, K.J.; Morgan, J.P.; Hickey, B.J.; Arena, D.A.; Marrows, C.H.

Authors

Dr Aidan Hindmarch a.t.hindmarch@durham.ac.uk
Associate Professor

K.J. Dempsey

J.P. Morgan

B.J. Hickey

D.A. Arena

C.H. Marrows

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.

Citation

Hindmarch, A., Dempsey, K., Morgan, J., Hickey, B., Arena, D., & Marrows, C. (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), Article 172511. https://doi.org/10.1063/1.3012368

Journal Article Type	Article
Publication Date	Oct 27, 2008
Deposit Date	Jan 27, 2012
Publicly Available Date	Aug 15, 2012
Journal	Applied Physics Letters
Print ISSN	0003-6951
Electronic ISSN	1077-3118
Publisher	American Institute of Physics
Peer Reviewed	Peer Reviewed
Volume	93
Issue	17
Article Number	172511
DOI	https://doi.org/10.1063/1.3012368
Keywords	Cobalt, Coercive force, Ferromagnetic materials, Magnetic circular dichroism, Magnetic hysteresis, Nanostructured materials, Permalloy.

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Copyright Statement
© 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