Axial Magnetic Anisotropy from Two Systems Fe$_2$B and Co$_2$B with Planar Anisotropy

ORAL

Abstract

Growth of single crystals of (Fe$_{1-x}$Co$_x$)$_2$B ($0\leq x\leq1$) and detailed characterization of their magnetic properties will be presented. Despite the fact that both Fe$_2$B and Co$_2$B show a planar anisotropy at room temperature, we observe a uniaxial anisotropy at intermediate doping which makes (Fe,Co)$_2$B a promising system for permanent magnet applications in a system without rare-earth element. Comparison with recent band structure calculations will be presented. The temperature dependence of the anisotropy measured on single crystals from $2$~K to $1000$~K shows some unusual variations with an increase of the magnetic anisotropy with increasing temperature at some specific substitution. \\[4pt] This work is supported by the Critical Materials Institute, an Energy Innovation Hub funded by the US DOE and by the Office of Basic Energy Science, Division of Materials Science and Engineering. Ames Laboratory is operated for the US DOE by Iowa State University under Contract No. DE-AC02-07CH11358.

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Authors

  • Valentin Taufour

    • Ames Laboratory
    • Ames Laboratory/ Iowa State University, Ames, IA 50011, USA

  • Tej Lamichhane

    • Ames Laboratory/ Iowa State University, Ames, IA 50011, USA

  • Sergey L. Bud'ko

    • Ames Laboratory/ Iowa State University, Ames, IA 50011, USA
    • Ames Laboratory, Iowa State University
    • Iowa State University, Ames Laboratory
    • Ames Lab/ISU

  • Anton Jesche

    • Ames Laboratory/ Iowa State University, Ames, IA 50011, USA

  • Alan I. Goldman

    • Ames Laboratory/ Iowa State University, Ames, IA 50011, USA

  • Kevin W. Dennis

    • Ames Laboratory/ Iowa State University, Ames, IA 50011, USA

  • R. William McCallum

    • Ames Laboratory/ Iowa State University, Ames, IA 50011, USA

  • Vladimir Antropov

    • Ames Lab, Ames, IA
    • Ames Laboratory, Ames, Iowa 50011, USA
    • Ames Laboratory/ Iowa State University, Ames, IA 50011, USA
    • Ames Laboratory, Ames, USA
    • Ames Laboratory

  • P.C. Canfield

    • The Ames Laboratory, Iowa State University, Ames, Iowa, USA
    • Ames Laboratory/ Iowa State University, Ames, IA 50011, USA
    • Iowa State University
    • Ames Laboratory/Iowa State University