Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/131694
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | High temperature magnetic stabilization of cobalt nanoparticles by an antiferromagnetic proximity effect |
Autor: | Toro, José A. de; Marques, Daniel P.; Muñiz, Pablo; Skumryev, Vassil; Sort, Jordi CSIC ORCID; Givord, Dominique; Nogués, Josep CSIC ORCID | Fecha de publicación: | 2015 | Editor: | American Physical Society | Citación: | Physical Review Letters 115(5):057201 (2015) | Resumen: | Thermal activation tends to destroy the magnetic stability of small magnetic nanoparticles, with crucial implications for ultrahigh density recording among other applications. Here we demonstrate that low-blocking-temperature ferromagnetic (FM) Co nanoparticles (TB<70K) become magnetically stable above 400 K when embedded in a high-Néel-temperature antiferromagnetic (AFM) NiO matrix. The origin of this remarkable TB enhancement is due to a magnetic proximity effect between a thin CoO shell (with low Néel temperature, TN, and high anisotropy, KAFM) surrounding the Co nanoparticles and the NiO matrix (with high TN but low KAFM). This proximity effect yields an effective antiferromagnet with an apparent TN beyond that of bulk CoO, and an enhanced anisotropy compared to NiO. In turn, the Co core FM moment is stabilized against thermal fluctuations via core-shell exchange-bias coupling, leading to the observed TB increase. Mean-field calculations provide a semiquantitative understanding of this magnetic-proximity stabilization mechanism. | Descripción: | Under the terms of the Creative Commons Attribution License 3.0 (CC-BY). | Versión del editor: | http://dx.doi.org/10.1103/PhysRevLett.115.057201 | URI: | http://hdl.handle.net/10261/131694 | DOI: | 10.1103/PhysRevLett.115.057201 | Identificadores: | doi: 10.1103/PhysRevLett.115.057201 e-issn: 1079-7114 issn: 0031-9007 |
Aparece en las colecciones: | (CIN2) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
AntiferromagneticProximity.pdf | 287,46 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
59
checked on 10-abr-2024
WEB OF SCIENCETM
Citations
59
checked on 21-feb-2024
Page view(s)
203
checked on 18-abr-2024
Download(s)
433
checked on 18-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Este item está licenciado bajo una Licencia Creative Commons