Evidence of Finite Size Effect on the Neel Temperature in Ultra-Thin Layers of CoO Nanograins

TitleEvidence of Finite Size Effect on the Neel Temperature in Ultra-Thin Layers of CoO Nanograins
Publication TypeJournal Article
Year of Publication2011
AuthorsMolina-Ruiz, M, Lopeandía, AF, Pi, F, Givord, D, Bourgeois, O, Rodríguez-Viejo, J
JournalPhysical Review B
Volume83
Start Page140407(R)
Abstract

A significant reduction in the Néel temperature of CoO ultrathin films is revealed by highly sensitive specific heat measurement. It is found that the films consist of weakly coupled antiferromagnetic (AF) grains. The TN reduction from large to small grain samples scales with the grain size reduction, according to the Binder theory of critical phenomena in systems of reduced dimensions. In these finite AF nanosystems, the intergrain exchange interaction is reduced by the presence of surface Co spins, weakly coupled to Co moments inside the grains.

URLhttp://link.aps.org/doi/10.1103/PhysRevB.83.140407
DOI10.1103/PhysRevB.83.140407
Short TitlePhys. Rev. B 83, 140407(R) (2011)
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