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Critical size for exchange bias in ferromagnetic-antiferromagnetic particles

AuthorsDobrynin, A. N.; Ievlev, D. N.; Temst, K.; Lievens, P.; Margueritat, J. ; Gonzalo de los Reyes, José; Afonso, Carmen N. ; Zhou, S. Q.; Vantomme, A.; Piscopiello, E.; Van Tendeloo, G.
Keywords[PACS] Fine-particle systems; nanocrystalline materials
[PACS] Other ferromagnetic metals and alloys
[PACS] Antiferromagnetics
[PACS] Magnetization curves, hysteresis, Barkhausen and related effects
[PACS] Magnetocaloric effect, magnetic cooling
[PACS] Exchange and superexchange interactions
[PACS] Structure of nanoscale materials
[PACS] Surface thermodynamics, surface energies
Issue Date27-Jun-2005
PublisherAmerican Institute of Physics
CitationApplied Physics Letters, 87 (1) : 012501 (2005)
AbstractWe present a study of the magnetic properties of oxidized Co nanoparticles with an average grain size of 3 nm, embedded in an amorphous Al₂O₃ matrix. These nanoparticles can be considered as imperfect Co-core CoO-shell systems. Magnetization measurements after magnetic field cooling show a vertical shift of the hysteresis loop, while no exchange bias is observed. With a simple model, we show that there is a critical grain size for hybrid ferromagnetic-antiferromagnetic particles, below which exchange bias is absent for any ratio of ferromagnetic and antiferromagnetic constituents. The reason is that the interfacial exchange energy dominates over other energies in the system due to a large surface-to-volume ratio in the nanoparticles.
Description3 pags. ; 3 figs.
Publisher version (URL)http://dx.doi.org/10.1063/1.1978977
Appears in Collections:(CFMAC-IO) Artículos
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