  The defect tolerance nature of organic-inorganic hybrid perovskite is
reflected from its stupendous growth in photovoltaic performances. The presence
of lattice defect can manipulate or even gives rise to some exceptional
properties which otherwise would have remained unseen. One of such properties
reported in this article is the experimental observation of defect mediated
room temperature ferromagnetism in methylammonium lead halide perovskite for
the very first time, ably supported by ab-initio calculations. Theoretical
analysis predicts the ferromagnetism principally arises from the iodide
vacancies in the orthorhombic and cubic crystal phases but not in the
tetragonal phase. The low temperature (100 K) ferromagnetic hysteresis loop was
stable even at a high temperature of 380 K substantiating the fact that the
origin of magnetism embedded in its defective nature.
