Probing polarization-tunable sub-terahertz spin pumping in bimodal α-Fe2O3/Pt

Fritjofson, Gregory; Regmi, Atul; Hanson-Flores, Jacob; Michel, Justin; Tang, Junyu; Yang, Fengyuan; Cheng, Ran; Del Barco, Enrique

doi:10.1038/s44306-025-00086-z

Probing polarization-tunable sub-terahertz spin pumping in bimodal α-Fe₂O₃/Pt

Journal Article · Fri Jun 20 00:00:00 EDT 2025 · npj Spintronics

DOI:https://doi.org/10.1038/s44306-025-00086-z· OSTI ID:3000099

Fritjofson, Gregory ^[1]; Regmi, Atul ^[1]; Hanson-Flores, Jacob ^[1]; Michel, Justin ^[2]; Tang, Junyu ^[3]; Yang, Fengyuan ^[2]; Cheng, Ran ^[4]; Del Barco, Enrique ^[1]

Univ. of Central Florida, Orlando, FL (United States)
The Ohio State Univ., Columbus, OH (United States)
The Ohio State Univ., Columbus, OH (United States); Univ. of California, Riverside, CA (United States)
Univ. of California, Riverside, CA (United States)

Hematite (α-Fe₂O₃) is an insulating antiferromagnet possessing a room temperature canted phase induced by the super-exchange Dzyaloshinskii-Moriya Interaction (DMI), resulting in enhanced spin pumping and spin transport over uniaxial antiferromagnets. In this work we resonantly excite the quasi-ferromagnetic (acoustic) and purely antiferromagnetic (optical) spin-dynamical modes in bulk and thin-film heterostructures of α-Fe₂O₃/Pt at room temperature, inducing inverse-spin-Hall-voltages up to 255 GHz. Following recent measurements of optical-mode spin-pumping in α-Fe₂O₃, we observe a novel and exotic microwave polarization mapping along with amplified spin-charge conversion in the optical branch and discuss the implications of layer thickness on acoustic and optical spin-modes. The results provide a deeper understanding of spin-wave selection rules for canted antiferromagnets and their potential use in nanoscale terahertz spintronics.

View Accepted Manuscript (DOE)

Research Organization:: The Ohio State Univ., Columbus, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: SC0001304

OSTI ID:: 3000099

Journal Information:: npj Spintronics, Journal Name: npj Spintronics Journal Issue: 1 Vol. 3; ISSN 2948-2119

Publisher:: Springer Science and Business Media LLCCopyright Statement

Country of Publication:: United States

Language:: English

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