posted on 2020-02-21, 22:29authored byMartin 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.