4.6 Article

Engineered spin-valve type magnetoresistance in Fe3O4-CoFe2O4 core-shell nanoparticles

Journal

APPLIED PHYSICS LETTERS
Volume 103, Issue 10, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/1.4819956

Keywords

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Funding

  1. Department of Science and Technology, India
  2. Swedish Research Council (VR)
  3. Goran Gustafsson Foundation, Sweden
  4. Japan Society for the Promotion of Science (JSPS)

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Naturally occurring spin-valve-type magnetoresistance (SVMR), recently observed in Sr2FeMoO6 samples, suggests the possibility of decoupling the maximal resistance from the coercivity of the sample. Here we present the evidence that SVMR can be engineered in specifically designed and fabricated core-shell nanoparticle systems, realized here in terms of soft magnetic Fe3O4 as the core and hard magnetic insulator CoFe2O4 as the shell materials. We show that this provides a magnetically switchable tunnel barrier that controls the magnetoresistance of the system, instead of the magnetic properties of the magnetic grain material, Fe3O4, and thus establishing the feasibility of engineered SVMR structures. (C) 2013 AIP Publishing LLC.

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