Low loss spin wave resonances in organic-based ferrimagnet vanadium tetracyanoethylene thin films

We experimentally demonstrate high quality factor spin wave resonances in an encapsulated thin film of the organic-based ferrimagnet vanadium tetracyanoethylene (V[TCNE](x similar to 2)) coated on an a-plane sapphire substrate by low temperature chemical vapor deposition. The thickness standing wave modes are observed in a broad frequency range (1 GHz-5GHz) with high quality factor exceeding 3200 in ambient air at room temperature, rivaling those of inorganic magnetic materials. The exchange constant of V[TCNE](x similar to 2), a crucial material parameter for future study and device design of the V[TCNE](x similar to 2), is extracted from the measurement with a value of (4.61 +/- 0.35) x 10(-16) m(2). Our result establishes the feasibility of using organic-based materials for building hybrid magnonic devices and circuits. Published by AIP Publishing.