AIP Advances (Dec 2018)

Probing the exchange coupling in the complex modified Ho-Fe-B compounds by high-field magnetization measurements

  • I. S. Tereshina,
  • A. P. Pyatakov,
  • E. A. Tereshina-Chitrova,
  • D. I. Gorbunov,
  • Yu. Skourski,
  • J. M. Law,
  • M. A. Paukov,
  • L. Havela,
  • M. Doerr,
  • A. K. Zvezdin,
  • A. V. Andreev

DOI
https://doi.org/10.1063/1.5062588
Journal volume & issue
Vol. 8, no. 12
pp. 125223 – 125223-5

Abstract

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By examining the Ho2Fe14B case, we explored the influence of substitution and absorption atoms on the high-field behavior of magnetization of rare-earth (R)-Fe intermetallics. The value of the first critical field shows that the inter-sublattice exchange interactions remain practically unchanged when the substitution takes place in the R sublattice (replacement of up to 50 % of Ho by Nd). On the contrary, hydrogen absorption by Ho2Fe14B and Ho1Nd1Fe14B of the maximum possible hydrogen concentration 5.5 at./f.u. decreases the strength of the R-Fe exchange by 30%. Remarkably, the influence of hydrogenation is stronger in the compound modified by substitution.