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Abstract <p>The structure and the magnetic and magnetocaloric properties of Ho((Co<sub>1 – <i>y</i></sub>Ni<sub><i>y</i></sub>)<sub>0.84</sub>Fe<sub>0.16</sub>)<sub>2</sub> compounds are investigated. The substitution of Co by Ni leads to weakening of the energy of the 4<i>f</i>–3<i>d</i> sublattice exchange interaction and to the appearance of a pronounced low-temperature maximum in the temperature dependence of the change in the magnetic entropy (∆<i>S</i><sub>m</sub>). As a result, the ∆<i>S</i><sub>m</sub> values increase by a factor of up to 2. The calculated values of the heat capacity (<i>q</i>) are comparable to or exceed the <i>q</i> values for metallic Gd.</p>

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Effect of Substitution of Co by Ni on the Magnetic Properties and Magnetocaloric Effect of Ho((Co1 – yNiy)0.84Fe0.16)2 Compounds

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • M. S. Anikin,
  • E. N. Tarasov,
  • A. V. Zinin,
  • M. I. Knyazev,
  • A. S. Sultanov,
  • M. A. Semkin,
  • V. V. Govorina,
  • N. V. Selezneva,
  • S. V. Andreev

摘要

Abstract

The structure and the magnetic and magnetocaloric properties of Ho((Co1 – yNiy)0.84Fe0.16)2 compounds are investigated. The substitution of Co by Ni leads to weakening of the energy of the 4f–3d sublattice exchange interaction and to the appearance of a pronounced low-temperature maximum in the temperature dependence of the change in the magnetic entropy (∆Sm). As a result, the ∆Sm values increase by a factor of up to 2. The calculated values of the heat capacity (q) are comparable to or exceed the q values for metallic Gd.