Strongly exchange coupled inverse ferrimagnetic soft/hard, Mn <inf>x</inf>Fe <inf>3-x</inf>O <inf>4</inf>/Fe <inf>x</inf>Mn <inf>3-x</inf>O <inf>4</inf>, core/shell heterostructured nanoparticles

A. López-Ortega, M. Estrader, G. Salazar-Alvarez, S. Estradé, I. V. Golosovsky, R. K. Dumas, D. J. Keavney, M. Vasilakaki, K. N. Trohidou, J. Sort, F. Peiró, S. Suriñach, M. D. Baró, J. Nogués

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Inverted soft/hard, in contrast to conventional hard/soft, bi-magnetic core/shell nanoparticles of Mn xFe 3-xO 4/Fe xMn 3-xO 4 with two different core sizes (7.5 and 11.5 nm) and fixed shell thickness (∼0.6 nm) have been synthesized. The structural characterization suggests that the particles have an interface with a graded composition. The magnetic characterization confirms the inverted soft/hard structure and evidences a strong exchange coupling between the core and the shell. Moreover, larger soft core sizes exhibit smaller coercivities and loop shifts, but larger blocking temperatures, as expected from spring-magnet or graded anisotropy structures. The results indicate that, similar to thin film systems, the magnetic properties of soft/hard core/shell nanoparticles can be fine tuned to match specific applications. © 2012 The Royal Society of Chemistry.
Idioma originalEnglish
Pàgines (de-a)5138-5147
Estat de la publicacióPublicada - 21 d’ag. 2012


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