  Ni/Ga bilayers are a versatile playground for exploring the competition of
the strongly antagonistic ferromagnetic and superconducting phases.
Systematically characterizing this competition's impact on highly ballistic
Al/Al$_2 $O$_3 $/Ni/Ga junctions' transport properties from both the
experimental and theoretical viewpoints, we identify novel conductance peak
structures, which are caused by superconducting triplet pairings at the Ni/Ga
interface, and which are widely adjustable through the Ni-Ga thickness ratio.
We demonstrate that these conductance anomalies persist even in the presence of
an in-plane magnetic field, which provides -- together with the detection of
the paramagnetic Meissner effect in Ga -- the clear experimental evidence that
the observed conductance features serve indeed as the triplet pairings' unique
transport fingerprints. Our work demonstrates that Ni/Ga bilayers have a strong
potential for superconducting spintronics applications, in particular for
triplet-pairing engineering.
