Large negative magnetoresistance effects in Co2Cr 0.6Fe0.4Al

T. Block, C. Felser, G. Jakob, J. Ensling, B. Mühling, P. Gütlich, R. J. Cava

Research output: Contribution to journalArticle

177 Scopus citations

Abstract

Materials, which display large changes in resistivity in response to an applied magnetic field (magnetoresistance) are currently of great interest due to their potential for applications in magnetic sensors, magnetic random access memories, and spintronics. Guided by striking features in the electronic structure of several magnetic compounds, we prepared the Heusler compound Co2Cr0.6Fe0.4Al. Based on our band structure calculations, we have chosen this composition in order to obtain a half-metallic ferromagnet with a van Hove singularity in the vicinity of the Fermi energy in the majority spin channel and a gap in the minority spin channel. We find a magnetoresistive effect of 30% in a small magnetic field of 0.1T at room temperature. This demonstrates the feasibility of a cheap and simple magnetic sensor based on polycrystalline, intermetallic material.

Original languageEnglish (US)
Pages (from-to)646-651
Number of pages6
JournalJournal of Solid State Chemistry
Volume176
Issue number2
DOIs
StatePublished - Dec 2003

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Keywords

  • Half-metallic ferromagnet
  • Heusler compound
  • Magnetoresistance

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    Block, T., Felser, C., Jakob, G., Ensling, J., Mühling, B., Gütlich, P., & Cava, R. J. (2003). Large negative magnetoresistance effects in Co2Cr 0.6Fe0.4Al. Journal of Solid State Chemistry, 176(2), 646-651. https://doi.org/10.1016/j.jssc.2003.07.002