The development of superconducting data storage devices is one of the coveted goals for next-generation low-power electronics, and interaction between superconducting and nontrivial topological states can potentially be useful to achieve this goal. Here we show that the superconducting diboride ${\mathrm{OsB}}_2$ hosts an anisotropic superconducting order parameter along with topological surface states which are spin polarized. Through the measurement of Andreev reflection on the surface of ${\mathrm{OsB}}_2$ we find that the superconducting order parameter senses the spin polarization of the topological surface states. As a consequence, the order parameter retains the memory of the exposure to a magnetic field, leading to a magnetic-field-dependent hysteresis effect. Thus we present nanoscale metallic junctions made on the surface of ${\mathrm{OsB}}_2$ as energy-efficient superconducting memory devices.

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• Andreev reflection
• First-principles calculations
• Superconductivity
• Topological materials