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Emerging magnetic phase in the orthoferrite detected by spin Hall magnetoresistance and spin Seebeck effect
Phys. Rev. B 112, 104432 – Published 22 September, 2025
DOI: https://doi.org/10.1103/q38x-g97c
Abstract
The orthoferrite exhibits a complex interplay of magnetic interactions between the antiferromagnetically ordered spins and the rare-earth ions. In this work, we combine superconducting quantum interference device (SQUID) magnetometry studies with electrical spin transport measurements of the spin Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) on a single crystal interfaced by a thin Pt layer. Our measurements show that the increase in Ho magnetic susceptibility below the Morin-like spin reorientation transition at affects the magnetic anisotropy of the Fe sublattice and induces a tilting of the easy axis. Below the ordering temperature of Ho at , we observe a rapid increase in the SSE signal associated with the emergence of low-energy magnon modes with the onset of Ho-Ho exchange. These findings demonstrate that spin transport techniques can sensitively probe rare-earth–induced modifications of anisotropy and spin dynamics in complex oxides, opening pathways to electrically access low-energy excitations.
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