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Magnetic Properties and Mössbauer Spectroscopy of Fe3O4/CoFe2O4 Nanorods

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posted on 2020-02-21, 22:29 authored by Martin Hähsler, Joachim Landers, Tim Nowack, Soma Salamon, Michael Zimmermann, Stefan Heißler, Heiko Wende, Silke Behrens
Fe3O4/CoFe2O4 nanorods were obtained via a simple seed-mediated synthesis. Nanorods were used as seeds to grow CoFe2O4 by thermal codecomposition of the cobalt­(II) and iron­(III) acetylacetonate precursors. The growth process was monitored by electron microscopy (SEM, TEM), and the resulting nanorods were characterized by powder X-ray diffraction analysis and IR and Raman spectroscopy. Magnetometry and AC susceptometry studies revealed a distribution of Néel relaxation times with an average blocking temperature of 140 K and a high-field magnetization of 42 Am2/kg. Complementarily recorded 57Fe–Mössbauer spectra were consistent with the Fe3O4/CoFe2O4 spinel structure and exhibited considerable signs of spin frustration, which was correlated to the internal and surface structure of the nanorods.

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