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Strongly exchange coupled inverse ferrimagnetic soft/hard, Mn(x)Fe(3-x)O(4)/Fe(x)Mn(3-x)O(4), core/shell heterostructured nanoparticles López-Ortega, Alberto Estrader i Bofarull, Marta Salazar-Alvarez, German Estradé Albiol, Sònia Golosovsky, Igor V. Dumas, R.K. Keavney, D.J. Vasilakaki, Marianna Trohidou, Kalliopi N. Sort, Jordi Peiró Martínez, Francisca Suriñach, Santiago (Suriñach Cornet) Baró, M. D. Nogués, Josep Ferrita Manganès Nanopartícules Propietats magnètiques Ferrite Manganese Nanoparticles Magnetic properties 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 2020-04-03T07:51:32Z 2020-04-03T07:51:32Z 2012-06-18 2020-04-03T07:51:33Z info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion Versió postprint del document publicat a: https://doi.org/10.1039/C2NR30986F Nanoscale, 2012, vol. 4, num. 16, p. 5138-5147 https://doi.org/10.1039/C2NR30986F info:eu-repo/grantAgreement/EC/FP7/247518/EU//ONDA (c) López-Ortega, Alberto et al., 2012 info:eu-repo/semantics/openAccess Royal Society of Chemistry Articles publicats en revistes (Química Inorgànica i Orgànica)