  There have been continuous efforts in searching for unconventional
superconductivity over the past five decades. Compared to the well-established
d-wave superconductivity in cuprates, the existence of superconductivity with
other high-angular-momentum pairing symmetries is less conclusive. Bi/Ni
epitaxial bilayer is a potential unconventional superconductor with broken time
reversal symmetry (TRS), for that it demonstrates superconductivity and
ferromagnetism simultaneously at low temperatures. We employ a specially
designed superconducting quantum interference device (SQUID) to detect, on the
Bi/Ni bilayer, the orbital magnetic moment which is expected if the TRS is
broken. An anomalous hysteretic magnetic response has been observed in the
superconducting state, providing the evidence for the existence of chiral
superconducting domains in the material.
