Large magnetic Bragg peak enhancement by ultrasound injection on FeTiO

社本 真一; Shin, K.*; 赤津 光洋*; 今井 正樹; 植田 大地*; 横尾 哲也*; 根本 祐一*; Hassan, A. M. A.*; Chang, L.-J.*; 家田 淳一; et al.

Applied Physics Letters, 127(13), p.132403_1 - 132403_5, 2025/09

https://doi.org/10.1063/5.0273424

FeTiO is an ilumenite antiferromagnetic insulator with Fe. Two-dimensional ferromagnetic honeycomb layers are antifferomagnetically stacked along the -axis. The magnetic Bragg peak intensity is enhanced by ultrasound injection up to 300 % on the FeTiO crystal at low temperatures. The large enhancement is attributed to the large spin-lattice coupling of Fe in FeTiO. The enhancement is lost above 35 K, suggesting that the energy splitting of the Fe levels by the spin-orbit coupling is about 35 K. This finding opens a possibility for high efficiency acoustic spin pumping.