  The magnetic spin degrees of freedom in magnetic materials serve as
additional capability to tune materials properties, thereby invoking
magneto-optical response. Herein, we report the magneto-optoelectronic
properties of a family of lead-free magnetic double perovskites Cs_{2}AgTX_{6}
(T = Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu; X=Cl, Br, I). This turns out to provide
an extremely fertile series, giving rise to potential candidate materials for
photovoltaic(PV) applications. In conjunction with high absorption coefficient
and high simulated power conversion efficiency for PV applications, few
compounds in this series exhibit novel magnetic character useful for spintronic
applications. The interaction between magnetism and light can have far-reaching
results on the photovoltaic properties as a consequence of the shift in the
defect energy levels due to Zeeman effect. This subsequently affects the
recombination rate of minority carriers, and hence the photoconversion
efficiency. Moreover, the distinct ferromagnetic and anti-ferromagnetic
ordering driven by hybridization and super-exchange mechanism can play a
significant role to break the time-reversal and/or inversion symmetry. Such a
coalescence of magnetism and efficient optoelectronic response has the
potential to trigger magnetic/spin anomalous photovoltaic (non-linear Optical)
effect in this Cs$_{2}$AgTX$_{6}$ family. These insights can thus channelize
the advancement of lead-free double perovskites in magnetic/spin anomalous
photovoltaic field as well.
