Spin-triplet superconductors are considered a promising platform for dissipationless spin transport, where spin currents are carried by spin-triplet Cooper pairs. In this paper, we propose that the spin-triplet superconductivity and spin supercurrent can be engineered in an altermagnetic superconducting nanowire, where a one-dimensional nanowire is placed on the surface of an $s$-wave superconductor and in proximity to the altermagnet. Using the nonequilibrium Green's function method, we demonstrate a nonzero equal-spin Andreev reflection coefficient at the normal metal–altermagnetic superconducting nanowire interface, thereby verifying the injection of spin-triplet Cooper pairs. Furthermore, we systematically investigate the spin transport properties in this hybrid system under a spin bias. Our results demonstrate that these properties can be effectively tuned by the chemical potential and spin bias orientation. Our proposal provides a pathway toward realizing dissipationless spin transport.

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• Andreev reflection
• Spin injection
• Spin-triplet pairing
• 1-dimensional systems
• Altermagnets
• Nanowires
• Nonequilibrium Green's function