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Superconductors

Emerging Magnetic Phase in Orthoferrite HoFeO3 Detected by Spin Hall Magnetoresistance and Spin Seebeck Effect

Strategic Insights

— 2 min read

Researchers from the University of Cambridge have made significant findings in the field of physics, detailing a new data on the magnetic properties of the orthoferrite HoFeO3. The study reveals a complex interplay of magnetic interactions between the antiferromagnetically ordered Fe3+ spins and the rare-earth Ho3+ ions. By combining superconducting quantum interference device (SQUID) magnetometry studies with electrical spin transport measurements, the researchers have observed a rapid increase in the spin Seebeck effect signal associated with the emergence of low-energy magnon modes with the onset of Ho-Ho exchange. This research has been peer-reviewed and has significant implications for the study of spin transport techniques and their potential applications in accessing low-energy 4f excitations.

Key Takeaways:

  • The orthoferrite HoFeO3 exhibits a complex interplay of magnetic interactions between the antiferromagnetically ordered Fe3+ spins and the rare-earth Ho3+ ions.
  • Superconducting quantum interference device (SQUID) magnetometry studies have been combined with electrical spin transport measurements of the spin Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) on a HoFeO3 single crystal interfaced by a thin Pt layer.
  • The research has observed a rapid increase in the SSE signal associated with the emergence of low-energy magnon modes with the onset of Ho-Ho exchange.
  • The findings demonstrate that spin transport techniques can sensitively probe rare-earth-induced modifications of anisotropy and spin dynamics in complex oxides.
  • The study has been funded by the Cambridge Trust, Trinity-Henry Barlow Studentship, Royal Society UK, Leverhulme Trust, UKRI Frontier Research Guarantee grant, Research Council of Norway, European Union (EU), European Research Council (ERC), Dutch Ministry of Education, Culture and Science (OCW), and Royal Commission of 1851 Research Fellowship.
  • The researchers have observed a rapid increase in the SSE signal associated with the emergence of low-energy magnon modes with the onset of Ho-Ho exchange, which has significant implications for the study of spin transport techniques and their potential applications in accessing low-energy 4f excitations.
  • The study has been peer-reviewed and has been published in Physical Review B, 2025; 112(10).

Statistics:

  • The study has been funded by a total of 10 organizations, including government agencies, research councils, and private foundations.
  • The research has observed a rapid increase in the SSE signal by 58 K.
  • The study has demonstrated that spin transport techniques can sensitively probe rare-earth-induced modifications of anisotropy and spin dynamics in complex oxides.
  • The research has been peer-reviewed and has been published in Physical Review B, 2025; 112(10).

Sources:

  • Emerging Magnetic Phase In the Orthoferrite Hofeo3 Detected By Spin Hall Magnetoresistance and Spin Seebeck Effect. Physical Review B, 2025; 112(10).
  • NewsRx. Researchers from University of Cambridge Describe Findings in Physics (Emerging Magnetic Phase In the Orthoferrite Hofeo3 Detected By Spin Hall Magnetoresistance and Spin Seebeck Effect). Journal of Physics Research. October 21, 2025; p 671.
  • American Physical Society. Physical Review B. (www.aps.org)

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