Unusual magnetic damping effect in a silver-cobalt ferrite hetero nano-system

CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOThe static and dynamic magnetic response of the newly synthesized CoFe2O4-Ag hetero nano-system showed significant enhancement in the effective energy barrier and reduction of the magnetic hardness of CoFe2O4 upon interaction with non-magnetic Ag as compared to neat CoFe2O4. The observed magnetic properties of CoFe2O4-Ag have been dissected in detail using the superparamagnetic Stoner-Wohlfarth and Neel-Arrhenius/Vogel-Fulcher models with the aid of micromagnetic simulations. This journal isThe static and dynamic magnetic response of the newly synthesized CoFe2O4-Ag hetero nano-systemshowed significant enhancement in the effective energy barrier and reduction of the magnetic hardness of CoFe2O4 upon interaction with non-magnetic Ag as compared to neat CoFe2O4. The observed magnetic properties of CoFe2O4-Ag have been dissected in detail using the superparamagnetic Stoner-Wohlfarth and Neel-Arrhenius/Vogel-Fulcher models with the aid of micromagnetic simulations.5221711717122CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOFAPESP - FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULOSem informaçãoSem informaçãoLi, Y., Zhang, Q., Nurmikko, A.V., Sun, S., (2005) Nano Lett., 5, p. 1689Pineider, F., Fernandez, C.D.J., Videtta, V., Carlino, E., Al Hourani, A., Wilhelm, F., Rogalev, A., Sangregorio, C., (2013) ACS Nano, 7, p. 857Jin, Y.D., Jia, C., Huang, S.W., O'Donnell, M., Gao, X., (2010) Nat. Commun., 1, p. 41Choi, S.H., Na, H.B., Park, Y.I., An, K., Kwon, S.G., Jang, Y., Park, M.H., Hyeon, T., (2008) J. Am. Chem. 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Mater., 23, p. 2378Authors from UNICAMP are very grateful to CNPq and FAPESP (Brazil). Authors from Czech Republic acknowledge research support from the project LO1305 of the Ministry of Education, Youth and Sports of the Czech Republic. In Chile, we acknowledge support from FONDECYT under grant 1120356, CONICYT, Grant ICM P10-061-F by FIC- MINECON, CEDENNA and AFOSR Grant FA9550-11-1-0347. The authors sincerely thank Dr Jiri Tucek (Regional Centre of Advanced Technologies and Materials, Czech Republic) for carrying out the Mössbauer experiments and analysis