  Conventional spin-singlet superconductivity that deeply penetrates into
ferromagnets is typically killed by the exchange interaction, which destroys
the spin-singlet pairs. Under certain circumstances, however, superconductivity
survives this interaction by adopting the pairing behavior of spin triplets.
The necessary conditions for the emergence of triplet pairs are
well-understood, owing to significant developments in theoretical frameworks
and experiments. The long-term challenges to inducing superconductivity in
magnetic semiconductors, however, involve difficulties in observing the finite
supercurrent, even though the generation of superconductivity in host materials
has been well-established and extensively examined. Here, we show the first
evidence of proximity-induced superconductivity in a ferromagnetic
semiconductor (In, Fe)As. The supercurrent reached a distance scale of $\sim
1~\mu$m, which is comparable to the proximity range in two-dimensional
electrons at surfaces of pure InAs. Given the long range of its proximity
effects and its response to magnetic fields, we conclude that spin-triplet
pairing is dominant in proximity superconductivity. Therefore, this progress in
ferromagnetic semiconductors is a breakthrough in semiconductor physics
involving unconventional superconducting pairing.
