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Ionic Liquid Gating Control of Spin Wave Resonance in La 0.7 Sr 0.3 MnO 3 Thin Film
Author(s) -
Zhao Shishun,
Hou Weixiao,
Zhou Ziyao,
Li Yaojin,
Zhu Mingmin,
Li Haobo,
Li Chunlei,
Hu Zhongqiang,
Yu Pu,
Liu Ming
Publication year - 2020
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201900859
Subject(s) - materials science , gating , spin wave , ionic liquid , resonance (particle physics) , spectroscopy , analytical chemistry (journal) , condensed matter physics , nuclear magnetic resonance , optoelectronics , atomic physics , physics , ferromagnetism , chemistry , physiology , biochemistry , quantum mechanics , chromatography , biology , catalysis
Magnonics or spin waves have the potential to serve as the carrier for future information communication. A controllable spin wave resonance (SWR) device is demonstrated in a Au/[DEME] + [TFSI] − /LSMO/STO capacitor heterostructure, which could be regulated by ionic liquid gating (ILG) method. The SWR critical angle φ C , excitation position to perform uniform precession, is shifted in a reversible manner (thus recording “off” and “on”) with +1.5 V gating voltage ( V g ), measured by quantitative angular dependent electron spin resonance (ESR) spectroscopy. Based on the modified Puszkarski's surface inhomogeneity model, the ILG control SWR at low V g ( V g < 1.5 V) can be explained by a charge‐doping‐induced effective surface magnetic anisotropy change. Applying a higher V g ( V g > 1.5 V) enhances the surface mode SWR and gradually diminishes the body mode SWR. Oxygen vacancies generate at higher V g ( V g > 1.5 V) resulting in the modulation of superexchange between the Mn ions, evidenced by X‐ray photoelectron spectroscopy and secondary ion mass spectroscopy characterization. This ILG control SWR presents a solution for energy efficient and low‐voltage control of magnonics and spin wave devices.