2026-04-13T05:40:36Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1549012025-12-04T21:32:54Zcom_2072_1057col_2072_478812col_2072_478917col_2072_478933

00925njm 22002777a 4500 dc López-Ortega, Alberto author Estrader i Bofarull, Marta author Salazar-Alvarez, German author Estradé Albiol, Sònia author Golosovsky, Igor V. author Dumas, R.K. author Keavney, D.J. author Vasilakaki, Marianna author Trohidou, Kalliopi N. author Sort, Jordi author Peiró Martínez, Francisca author Suriñach, Santiago (Suriñach Cornet) author Baró, M. D. author Nogués, Josep author 2020-04-03T07:51:32Z 2020-04-03T07:51:32Z 2012-06-18 2020-04-03T07:51:33Z 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 Ferrita Manganès Nanopartícules Propietats magnètiques Ferrite Manganese Nanoparticles Magnetic properties 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