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Findings demonstrate enhanced terahertz emission and durability in a flexible spintronic heterostructure, suggesting advances in communications.
Flexible spintronic heterostructure based on topological insulators (TI) enables terahertz (THz) generation for spectroscopy and next-generation communications. Challenges remain in enhancing THz intensity and mechanical durability. Here, Bi2Te3(10 nm)/FeNi(3 nm) on polyimide substrates was optimized via growth temperature tuning and Pt interlayer insertion. The heterostructure shows a 3.8-fold THz enhancement over single layers, attributed to topological surface states (TSSs) of Bi2Te3. Pt interlayer (1.5 nm) boosts emission by 467% (vs no Pt) and 17% (vs Pt/FeNi bilayer) via the inverse spin Hall effect of Pt and preserved TSSs of the TI. Devices retain 98% THz emission after 1200 bending cycles, highlighting potential for flexible THz emission.
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Pu et al. (2026) studied this question.
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