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http://hdl.handle.net/10773/6298
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 |
URI: | http://hdl.handle.net/10773/6298 |
DOI: | 10.1103/PhysRevB.82.094433 |
ISSN: | 1098-0121 |
Appears in Collections: | DQ - Artigos |
Files in This Item:
File | Description | Size | Format | |
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PHYSICAL REVIEW B 82, 094433 _2010.pdf | 883.82 kB | Adobe PDF | View/Open |
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