Shell pressure on the core of MnO/Mn3O4 core/shell nanoparticles

resumo

Here we show that spontaneous oxidation of MnO nanoparticles into MnO/Mn3O4 core/shell nanoparticles has the effect of a local pressure, decreasing the MnO cell parameter and increasing strain, resulting in the increase of the MnO antiferromagnetic/paramagnetic transition temperature T-N. These effects are more severe in smaller nanoparticles.

palavras-chave

MAGNETIC-PROPERTIES; MNO NANOPARTICLES; PHASE-TRANSITIONS; STRAINED SILICON; NANOCRYSTALS; EXCHANGE; EMISSION; NANORODS; FEO; GPA

categoria

Physics

autores

Silva, NJO; Karmaoui, M; Amaral, VS; Puente-Orench, I; Campo, J; da Silva, I; Ibarra, A; Bustamante, R; Millan, A; Palacio, F

nossos autores

agradecimentos

The authors thank Thomas Hansen and Susana Braga for their collaboration in the experiments at D20, Noemi Carmona for supplying the Mn3O4 XANES spectra, and Juan Rodriguez-Carvajal for enlightening discussions. The authors thank ILL, SpINS, and SpLine for beamtime allocation and IFIMUP-IN (Universidade do Porto) for access to the magnetometer laboratory. The Aveiro-Zaragoza collaboration has been supported by the Integrated Spanish-Portuguese Action PT2009-0131. The work in Zaragoza has been supported by Research Grants No. MAT2011-27233-C02-02, No. MAT2011-25991, and CONSOLIDER CSD2007-00010 from the Ministry of Education. The financial support of the CSIC and Spanish Ministerio de Ciencia e Innovacion (PI201060E013) is also acknowledged. The work in Aveiro has been supported by Fundacao para a Ciencia e Tecnologia, COMPETE, and FEDER programs (Pest-C/CTM/LA0011/2011). N.J.O.S. acknowledges FCT for the Ciencia 2008 program.

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