Low-Field Magnetoresistance Effect in Core–Shell Structured La0.7Sr0.3CoO3 Nanoparticles

Authors

  • Yang Wang,

    Corresponding author
    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
    • Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore.

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  • Hong Jin Fan

    1. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore, Singapore
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Abstract

Core–shell structured La0.7Sr0.3CoO3 nanoparticles are synthesized and their magnetic and magneto-transport properties are investigated. In these core–shell La0.7Sr0.3CoO3 nanoparticles, the cores are single-crystalline and ferromagnetic, whereas the shells are noncrystalline and predominantly paramagnetic. Moreover, the insulating-like shells can serve as a good spin tunneling barrier. Therefore, in such a special core–shell structure, the spin-polarized interparticle tunneling is improved due to the existence of shells, which thus induces an enhanced low-field magnetoresistance effect.

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