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

13 Scopus citations


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
Issue number2
StatePublished - Dec 10 2015

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by National
Natural Science Foundation of China (Grant No. 11204207)
and Ph.D. Programs Foundation of Ministry of Education of the
People’s Republic of China (Grant No. 20120032120074).

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics


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