Observation of large low-field magnetoresistance in spinel cobaltite: A new half-metal

Peng Li, Chuan Xia, Dongxing Zheng, Ping Wang, Chao Jin, Haili Bai

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Low-field magnetoresistance is an effective and energy-saving way to use half-metallic materials in magnetic reading heads and magnetic random access memory. Common spin-polarized materials with low field magnetoresistance effect are perovskite-type manganese, cobalt, and molybdenum oxides. In this study, we report a new type of spinel cobaltite materials, self-assembled nanocrystalline NiCo2O4, which shows large low field magnetoresistance as large as –19.1% at 0.5 T and –50% at 9 T (2 K). The large low field magnetoresistance is attributed to the fast magnetization rotation of the core nanocrystals. The surface spin-glass is responsible for the observed weak saturation of magnetoresistance under high fields. Our calculation demonstrates that the half-metallicity of NiCo2O4 comes from the hopping eg electrons within the tetrahedral Co-atoms and the octahedral Ni-atoms. The discovery of large low-field magnetoresistance in simple spinel oxide NiCo2O4, a non-perovskite oxide, leads to an extended family of low-field magnetoresistance materials. (© 2016 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim)
Original languageEnglish (US)
Pages (from-to)190-196
Number of pages7
Journalphysica status solidi (RRL) - Rapid Research Letters
Volume10
Issue number2
DOIs
StatePublished - Dec 10 2015

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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