Robust and Efficient Charge-to-Spin Conversion in the Topological Superconductor β-Bi₂Pd

Topological superconductors, characterized by topological surface states and strong spin–orbit coupling, offer an exciting platform for realizing fault-tolerant quantum computation and novel spintronic applications. Among the few candidates identified, β-Bi₂Pd has attracted particular attention due to its topological surface states and the intrinsic ability to host spin-triplet pairings. Using second-harmonic Hall and spin Hall magnetoresistance measurements, we demonstrate a pronounced, reliable, and robust charge-to-spin conversion in β-Bi₂Pd thin films. Moreover, the observed charge-to-spin conversion exhibits a strong correlation with the crystalline order of β-Bi₂Pd, emphasizing the importance of crystallinity in sustaining its topological properties. Furthermore, we achieve efficient current-induced magnetization switching in β-Bi₂Pd-based heterostructures. These findings establish β-Bi₂Pd as a versatile and robust platform for exploring spin transport and pave the way toward superconducting spintronic applications.