Unusual spin correlations in a nanomagnet

Balamurugan Balasubramanian, Priyanka Manchanda, Ralph Skomski, Pinaki Mukherjee, Bhaskar Das, T. A. George, George C. Hadjipanayis, David J. Sellmyer

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13 Scopus citations

Abstract

We show how atomic-scale exchange phenomena can be controlled and exploited in nanoscale itinerant magnets to substantially improve magnetic properties. Cluster-deposition experiments, first-principle simulations, and analytical calculations are used to demonstrate the effect in Co2Si nanoclusters, which have average sizes varying from about 0.6 to 29.5 nm. The cluster-deposited nanoparticles exhibit average magnetic moments of up to 0.70 μB/Co at 10 K and 0.49 μB/Co at 300 K with appreciable magnetocrystalline anisotropies, in sharp contrast to the nearly vanishing bulk magnetization. The underlying spin correlations and associated cluster-size dependence of the magnetization are explained by a surface induced ferromagnetic spin polarization with a decay length of the order of 1 nm, much larger than the nearest-neighbor interatomic distance in the alloy.

Original languageEnglish (US)
Article number242401
JournalApplied Physics Letters
Volume106
Issue number24
DOIs
StatePublished - Jun 15 2015

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Balasubramanian, B., Manchanda, P., Skomski, R., Mukherjee, P., Das, B., George, T. A., Hadjipanayis, G. C., & Sellmyer, D. J. (2015). Unusual spin correlations in a nanomagnet. Applied Physics Letters, 106(24), [242401]. https://doi.org/10.1063/1.4922725