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<p>The magnetocaloric effect enables magnetic refrigeration and plays an important role for cooling at cryogenic temperatures, which is essential for emergent technologies such as hydrogen liquefaction and quantum computing. Here, we study the origin of the low-temperature magnetocaloric effect in multiferroic hexagonal manganites. By conducting direct adiabatic temperature measurements in pulsed magnetic fields exceeding 20 T on different <i>R</i>MnO<sub>3</sub> systems with varying magnetic 4f-moments (i.e., <i>R</i> = Y, Ho, Er, and Tm), we demonstrate significant magnetic-field-driven reversible temperature changes, Δ<i>T</i><sub>ad</sub>. Our data show that the effect is predominantly driven by the rare-earth magnetism, scaling with the effective magnetic moment of the <i>R</i> atom. The largest reversible temperature change is observed in HoMnO<sub>3</sub> with Δ<i>T</i><sub>ad</sub> of up to 20.1 K, whereas the effect is largely suppressed in YMnO<sub>3</sub>. Our findings demonstrate the importance of the 4f-magnetism for the magnetocaloric effect in hexagonal manganites, which is expected to be relevant for other magnetic oxide systems and their optimization for refrigeration applications at cryogenic temperature.</p>

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Relation between 4f-magnetism and the low-temperature magnetocaloric effect in multiferroic hexagonal manganites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月11日

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  • Ruben Dragland,
  • Catalina Salazar Mejía,
  • Ingvild Hansen,
  • Yosuke Hamasaki,
  • Elvia Anabela Chavez Panduro,
  • Yoshitaka Ehara,
  • Tino Gottschall,
  • Dennis Meier,
  • Jan Schultheiß

摘要

The magnetocaloric effect enables magnetic refrigeration and plays an important role for cooling at cryogenic temperatures, which is essential for emergent technologies such as hydrogen liquefaction and quantum computing. Here, we study the origin of the low-temperature magnetocaloric effect in multiferroic hexagonal manganites. By conducting direct adiabatic temperature measurements in pulsed magnetic fields exceeding 20 T on different RMnO3 systems with varying magnetic 4f-moments (i.e., R = Y, Ho, Er, and Tm), we demonstrate significant magnetic-field-driven reversible temperature changes, ΔTad. Our data show that the effect is predominantly driven by the rare-earth magnetism, scaling with the effective magnetic moment of the R atom. The largest reversible temperature change is observed in HoMnO3 with ΔTad of up to 20.1 K, whereas the effect is largely suppressed in YMnO3. Our findings demonstrate the importance of the 4f-magnetism for the magnetocaloric effect in hexagonal manganites, which is expected to be relevant for other magnetic oxide systems and their optimization for refrigeration applications at cryogenic temperature.