The search for emerging materials combining magnetic and semiconducting properties has attracted widespread
interest in contemporary materials science. Chalcopyrite (CuFeS2), as an earth abundant and nontoxic chalcogenide compound
in the I?III?VI2 family, is a promising class of such materials that exhibit unusual electrical, optical, and magnetic properties.
However, its successful implementation largely depends on our ability to understand, control and manipulate their structural,
transport and spin behavior. Here we show that solution processing monodispersed CuFeS2 quantum dots exhibit a strong
coupling among optical, electronic, and magnetic degrees of freedom. The photoresponse and magnetoconductance of CuFeS2
quantum dots are realized under external stimuli. We further exploit a fast and efficient way to achieve an exceptionally large
performance in a magneto-optoelectronic hybrid system consisting of magnetic semiconducting CuFeS2 and conducting polymer
matrix. The results demonstrate a promising potential of magnetic semiconductor CuFeS2 in the field of spin electronics