TITLE

Temperature dependence of the magnetoresistance in Fe/MgO core/shell nanoparticles

AUTHOR(S)
Martinez-Boubeta, C.; Balcells, Ll.; Valencia, S.; Schmitz, D.; Monty, C.; Martínez, B.
PUB. DATE
June 2009
SOURCE
Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p262507
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The temperature dependence of magnetoresistance (MR) of powdered samples consisting of spherical Fe/MgO core/shell nanoparticles was analyzed. A change of the MR from normal at room temperature to inverse at low temperatures was observed. Concomitant with this, samples showed a sudden increase in the electrical resistance when approaching TV≈120 K, i.e., indicative of the Verwey transition temperature of Fe3O4. Thus, signaling the existence of magnetite at the Fe/MgO interface, further confirmed by means of x-ray magnetic circular dichroism. The change from normal to inverse MR is related to the increase in resistance of Fe3O4 on crossing the Verwey transition and reflects the negative spin polarization of Fe3O4.
ACCESSION #
42961916

 

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