Evidence of finite-size effect on the Néel temperature in ultrathin layers of CoO nanograins

M. Molina-Ruiz; A. F. Lopeandía; F. Pi; D. Givord; O. Bourgeois; J. Rodríguez-Viejo

doi:https://doi.org/10.1103/PhysRevB.83.140407

Evidence of finite-size effect on the Néel temperature in ultrathin layers of CoO nanograins

M. Molina-Ruiz, A. F. Lopeandía, F. Pi, D. Givord, O. Bourgeois, J. Rodríguez-Viejo

Research output: Contribution to journal › Article › Research › peer-review

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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. © 2011 American Physical Society.

Original language	English
Article number	140407
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	83
DOIs	https://doi.org/10.1103/PhysRevB.83.140407
Publication status	Published - 15 Apr 2011

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title = "Evidence of finite-size effect on the N{\'e}el temperature in ultrathin layers of CoO nanograins",

abstract = "A significant reduction in the N{\'e}el 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. {\textcopyright} 2011 American Physical Society.",

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AU - Givord, D.

AU - Bourgeois, O.

AU - Rodríguez-Viejo, J.

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AB - 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. © 2011 American Physical Society.

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