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

机译:CoO纳米颗粒超薄层中对Neel温度的有限尺寸影响的证据

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摘要

A significant reduction in the Neel 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 T_N 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 nanosy stems, the intergrain exchange interaction is reduced by the presence of surface Co spins, weakly coupled to Co moments inside the grains.
机译:高灵敏度的比热测量表明,CoO超薄膜的Neel温度显着降低。发现该膜由弱耦合的反铁磁(AF)晶粒组成。根据尺寸减小系统中关键现象的宾德理论,从大晶粒样品到小晶粒样品的T_N减小会随着晶粒尺寸的减小而缩放。在这些有限的AF纳米茎中,由于表面Co自旋的存在而减少了晶粒间的交换相互作用,而表面Co自旋与晶粒内部的Co矩弱耦合。

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