Large magnetic Bragg peak enhancement by ultrasound injection on FeTiO

Shamoto, Shinichi ; Shin, K.*; Akatsu, Mitsuhiro*; Imai, Masaki ; Ueta, Daichi*; Yokoo, Tetsuya*; Nemoto, Yuichi*; Hassan, A. M. A.*; Chang, L.-J.*; Ieda, Junichi ; Chung, J.-H.*

FeTiO is an ilumenite antiferromagnetic insulator with Fe $^{2+}$ . 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 $^{2+}$ in FeTiO. The enhancement is lost above 35 K, suggesting that the energy splitting of the Fe $^{2+}$ levels by the spin-orbit coupling is about 35 K. This finding opens a possibility for high efficiency acoustic spin pumping.

Language	:	English
Journal	:	Applied Physics Letters
Volume	:	127
Number	:	13
Pages	:	p.132403_1 - 132403_5
Publication Year/Month	:	2025/09
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Paper URL	:	https://doi.org/10.1063/5.0273424
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	spin-lattice coupling; ultrasound; neutron scattering
Research Facility	:	J-PARC物質・生命科学実験施設
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Registration No. : AA20250411
JAEA Abstracts No. : 53001080
Paper Submission No. : 29943

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