Efficient charge-to-spin conversion in the topological superconductor β-Bi2Pd at room temperature
Yu-Seng Ku, Chih-Chieh Chiang, Shuan-Cheng Mai, Jing-Yo Chen, Chao-Wei Chen, Yi-Ying Chin, Yann-Wen Lan, Danru Qu, C.L. Chien, Ssu-Yen Huang
DOI 10.1103/k7b8-6rp3 · Physical Review Applied
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Abstract
Topological superconductors with topological surface states and strong spin-orbit coupling present exciting opportunities for fault-tolerant quantum computing and advanced spintronic applications. Among the few identified topological superconductors, β-Bi2Pd is of particular interest for spintronic applications since it hosts superconductivity with spin-triplet pairing, offering the prospect of lossless spin supercurrent with infinite spin diffusion length. In this work, we explore the spin current phenomena in β-Bi2Pd at room temperature. Through harmonic Hall and spin Hall magnetoresistance measurements, we reveal substantial, reliable, and robust charge-to-spin conversion in β-Bi2Pd. In particular, spin current phenomena exhibit a strong dependence on the crystalline order of β-Bi2Pd, underscoring the critical role of crystal integrity in shaping its topological states. Furthermore, we showcase energy-efficient spin-orbit torque switching in β-Bi2Pd-based spintronic devices. These findings position β-Bi2Pd as a versatile and robust platform for spin current transport and lay the foundation for exploring spin supercurrent for advanced topological spintronic applications.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Pd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.9 | Pressure not reported | onset |
| Bi2Pd Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.1 | Pressure not reported | onset |
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