Perpendicular magnetization in CoO (111) layers induced by exchange interaction with ferromagnetic Co and Ni60Cu40 nanoclusters

Autor:	Ariel Brenac, L. Notin, R. Morel, D. Le Roy, Stéphanie Pouget
Rok vydání:	2012
Předmět:	Condensed Matter::Materials Science Magnetization Exchange bias Materials science Ferromagnetism Condensed matter physics Exchange interaction General Physics and Astronomy Curie temperature Condensed Matter::Strongly Correlated Electrons Coercivity Néel temperature Nanoclusters
Zdroj:	Journal of Applied Physics. 111:083901
ISSN:	1089-7550 0021-8979
Popis:	The magnetization reversal of ferromagnetic nanoparticles coupled by exchange with a CoO (111) thin film has been studied. The interfacial exchange interaction triggers the appearance of an out-of-plane magnetization in the CoO (111) film. Co and Ni60Cu40 particles were chosen, as they present an order of magnitude difference in the saturation magnetization and Curie temperatures that surround the Neel temperature of CoO. In both cases, the exchange coupling leads to an increase of the coercive field, up to 200% in Co particles, and small exchange bias of 100 Oe when the external magnetic field is applied in the CoO (111) plane. When the field is applied along the CoO [111] direction, an unexpected net magnetization of the CoO (111) layer is revealed. Interestingly, it scales with the particles magnetization. The results are explained in terms of a large interfacial interaction and an induced canting of the CoO spins in the close region of the interface. The large value of the CoO magnetization indicates ...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2325267f3cfc4a1ea7b872a2260a31c9 https://doi.org/10.1063/1.3702445 Zobrazit plný text záznamu