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

Research output: Contribution to journalArticle

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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

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magnetization
nanoclusters
magnets
magnetic moments
magnetic properties
nanoparticles
anisotropy
decay
polarization
simulation

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

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

Unusual spin correlations in a nanomagnet. / Balasubramanian, Balamurugan; Manchanda, Priyanka; Skomski, Ralph; Mukherjee, Pinaki; Das, Bhaskar; George, T. A.; Hadjipanayis, George C.; Sellmyer, David J.

In: Applied Physics Letters, Vol. 106, No. 24, 242401, 15.06.2015.

Research output: Contribution to journalArticle

Balasubramanian, B, Manchanda, P, Skomski, R, Mukherjee, P, Das, B, George, TA, Hadjipanayis, GC & Sellmyer, DJ 2015, 'Unusual spin correlations in a nanomagnet', Applied Physics Letters, vol. 106, no. 24, 242401. https://doi.org/10.1063/1.4922725
Balasubramanian B, Manchanda P, Skomski R, Mukherjee P, Das B, George TA et al. Unusual spin correlations in a nanomagnet. Applied Physics Letters. 2015 Jun 15;106(24). 242401. https://doi.org/10.1063/1.4922725
Balasubramanian, Balamurugan ; Manchanda, Priyanka ; Skomski, Ralph ; Mukherjee, Pinaki ; Das, Bhaskar ; George, T. A. ; Hadjipanayis, George C. ; Sellmyer, David J. / Unusual spin correlations in a nanomagnet. In: Applied Physics Letters. 2015 ; Vol. 106, No. 24.
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