ACTA

Tailoring Magnetic Properties of Cubic Spinel Ferrite Core-Shell Nanoparticles for Magnetoresistive Engineering

M. Kuźmiński^a, A. Belous^b, O. Yelenich^b, S. Solopan^b, K.M. Kosyl^a, A.N. Fitch^c, W. Paszkowicz^a, P. Dłużewski^a, A. Kaleta^a, N. Nedelko^a, A. Ślawska-Waniewska^a
^aInstitute of Physics, Polish Academy of Sciences, al. Lotników 32/46, PL-02668 Warsaw, Poland
^bV.I. Vernadskii Institute of General and Inorganic Chemistry, 32/34 Palladina Avenue, 03680 Kyiv, Ukraine
^cEuropean Synchrotron Radiation Facility (ESRF), BP 220, F-38043 Grenoble, France

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Magnetite nanoparticles with a cobalt ferrite shell provide the opportunity to obtain a tunneling magnetoresistance structure and offer an additional degree of freedom in shaping the magnetoresistive characteristics. In order to investigate the effect of the relative fractions of the shell on magnetic and magnetoresistive properties, we have prepared (by chemical co-precipitation) a bi-magnetic (soft/hard) core-shell Fe₃O₄/CoFe₂O₄ nanoparticle system (with diameters of a few nm). The structural, magnetic, and electric transport properties of the as-prepared core precursor, core-shell nanoparticles, and sintered powder were determined. It was found that the obtained particles, which are few nanometers in size, have the desired single-crystalline spinel structure with a core-shell architecture and the expected magnetic properties associated with core-shell interactions. Sintering leads to more complex magnetic behavior and tunneling conductance.

DOI:10.12693/APhysPolA.148.12
topics: ferrites, nanoparticles, magnetic properties, electrical properties