Magnetic order of Dy$^{3+}$ and Fe$^{3+}$ moments in antiferromagnetic DyFeO$_{3}$ probed by spin Hall magnetoresistance and spin Seebeck effect

TL;DR

This study uses spin Hall magnetoresistance and spin Seebeck effect measurements to investigate the magnetic order of Dy$^{3+}$ and Fe$^{3+}$ moments in DyFeO$_{3}$, revealing insights into spin reorientation and sublattice magnetizations.

Contribution

It demonstrates that SMR and SSE are effective tools for probing spin reorientation phase transitions and magnetic sublattice behavior in DyFeO$_{3}$.

Findings

SMR reflects antiferromagnetic order of Fe$^{3+}$ moments at high temperatures.

Linear dependence of SMR on magnetic field indicates Dy$^{3+}$ moments are field-induced up to room temperature.

SMR monitors spin-reorientation transitions of Fe$^{3+}$ spins at the Morin temperature.

Abstract

We report on spin Hall magnetoresistance (SMR) and spin Seebeck effect (SSE) in single crystal of the rare-earth antiferromagnet DyFeO$_{3}$ with a thin Pt film contact. The angular shape and symmetry of the SMR at elevated temperatures reflect the antiferromagnetic order of the Fe$^{3+}$ moments as governed by the Zeeman energy, the magnetocrystalline anisotropy and the Dzyaloshinskii-Moriya interaction. We interpret the observed linear dependence of the signal on the magnetic field strength as evidence for field-induced order of the Dy$^{3+}$ moments up to room temperature. At and below the Morin temperature of 50$\,$K, the SMR monitors the spin-reorientation phase transition of Fe$^{3+}$ spins. Below 23$\,$K, additional features emerge that persist below 4$\,$K, the ordering temperature of the Dy$^{3+}$ magnetic sublattice. We conclude that the combination of SMR and SSE is a simple and efficient tool to study spin reorientation phase transitions and sublattice magnetizations.