Organic chiral ferromagnets with strong spin-chiroptical interactions

The coexistence of ferromagnetism and chirality broadens the fundamental physical properties of chiral materials; however, organic chiral materials exhibiting ferromagnetism are still limited. Here, we fabricate organic chiral ferromagnets, where left-handed and right-handed organic chiral ferromagnets present a giant difference in saturation magnetization and coercivity. Such behavior can be attributed mainly to the helical arrangement of molecules generating orbital angular momentum. The chirality generates orbital angular momentum, acting as a key intermediate, and induces an interaction between the polarized spin and photon to realize spin-chiroptical coupling, where a series of circularly polarized transmissivity-magnetic field (T-H) loops is induced.