Remanent magnetization in CoO antiferromagnetic nanoparticles
authors Silva, NJO; Millan, A; Palacio, F; Martins, M; Trindade, T; Puente-Orench, I; Campo, J
nationality International
journal PHYSICAL REVIEW B
keywords X-RAY-DIFFRACTION; EXCHANGE BIAS; PARTICLES; SIZE; TEMPERATURE; GAMMA-FE2O3; FERROMAGNET; ANISOTROPY; NEUTRON; SPINS
abstract We report a study on the remanent magnetization M-r induced by field cooling across the ordering temperature T-N in antiferromagnetic CoO nanoparticles with different sizes. The nanoparticles are composed by a structurally and magnetically ordered core and a structurally ordered and magnetically disordered shell with a thickness of about 2 nm. The ordered core has cell parameters, moments direction, and modulus similar to those of bulk CoO. Mr is shown to be proportional to the cooling field H-cool. The low-temperature saturation values of M-r [M-r(0)] in the CoO nanoparticles are about two orders of magnitude higher than those found for bulk CoO. M-r/M-r(0) of CoO nanoparticles scales with temperature in a single curve, independently on the magnitude of Hcool and on nanoparticles size, except for temperatures near to T-N since T-N is size dependent.
publisher AMER PHYSICAL SOC
issn 1098-0121
year published 2010
volume 82
issue 9
digital object identifier (doi) 10.1103/PhysRevB.82.094433
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000282004700003
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journal analysis (jcr 2019):
journal impact factor 3.575
5 year journal impact factor 3.511
category normalized journal impact factor percentile 70.187
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