A variable temperature and field neutron study of the novel MR material Zn0.7Cu0.3Fe2O4
We have investigated the magnetic and magnetoresistant properties of the spinels Zn1-xCuxFe2O4. Negative magnetoresistance (MR) was observed for the whole series at 290 K and results show that as x increases from 0 – 0.3 the magnitude of the –MR recorded in a 9 T field increases from -2% to -9.8%. ZnFe2O4 is antiferromagnetic (TN = 10 K) but upon increasing x a ferrimagnetic or canted antiferromagnetic transition is observed and Tc increases with increasing x. Zn0.7Cu0.3Fe2O4 exhibits a broad magnetic transition at around 350 K. A second transition is also observed at 20 K. We propose that the sizeable –MR observed at room temperature in Zn0.7Cu0.3Fe2O4 arises due to a change in magnetic structure from a non-collinear Yafet-Kittel magnetic ordering to a collinear ferimagnetic structure upon applying a magnetic field. In order to investigate the magnetoresistant and magnetic properties further we propose to perform variable temperature and field neutron diffraction studies on the material Zn0.7Cu0.3Fe2O4, which exhibits the largest –MR.
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MCLAUGHLIN Abbie and BRUNELLI Michela. (2013). A variable temperature and field neutron study of the novel MR material Zn0.7Cu0.3Fe2O4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2276
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