Synergistic Effect of Chiral Nanofibers Amplifying the Orbit Angular Momentum To Enhance Optomagnetic Coupling

Abstract

Manipulating magnetic bits by photon in spintronics, opto-magnetic coupling, is lagging far behind what we could expect. To investigate the issue, one should face the problem to find photon dependence of spin dynamics and spin manipulation. In this work, through introducing chiral orbit in organic crystals, circularly polarized photon can manipulate spin via the channel of photon-orbit-spin interactions. Under the stimulus of the magnetic field, strong spin polarization will feed back to the change in polarized state of light. Moreover, twisting several chiral nanofibers into a thick one, a more pronounced opto-magnetic coupling is clearly observed due to the chirality generated larger chiral orbit. Meanwhile, spin dynamics (or spin response times) inside the aggregated thick chiral fiber can be further tuned by circularly polarized light. Hopefully, this study can deepen the understanding of organic chiral spin-photonics and enhance the application of organic functional crystals in the future.

Interfacial Engineering Enabled the Tunability of Organic Spin Polarization

“…Organic ferromagnets have attracted the interest of many researchers because the origin of their ferromagnetism differs from that of inorganic ferromagnets. − Particularly, the ferromagnetism generated via combining two nonferromagnetic organic materials is of fundamental and technological interest. Of these materials, organic charge-transfer ferromagnets − are intriguing because they also present an apparent spin-related physical phenomenon. − Generally, organic charge-transfer complexes are linked via noncovalent interfacial interactions, − which is beneficial in artificially manipulating organic charge-transfer ferromagnetism.…”