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Title: Remanent magnetization in CoO antiferromagnetic nanoparticles
Author: Silva, N. J. O.
Millán, A.
Palacio, F.
Martins, M.
Trindade, T.
Puente-Orench, I.
Campo, J.
Issue Date: Sep-2010
Publisher: American Physical Society
Abstract: We report a study on the remanent magnetization Mr induced by field cooling across the ordering temperature TN 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 Hcool. The low-temperature saturation values of Mr Mr 0 in the CoO nanoparticles are about two orders of magnitude higher than those found for bulk CoO. Mr /Mr 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 TN since TN is size dependent.
Peer review: yes
DOI: 10.1103/PhysRevB.82.094433
ISSN: 1098-0121
Appears in Collections:DQ - Artigos

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