On the Road to Quantum Magnonics: Extremely Low Loss Spin Waves in V[TCNE]2
Organic and organic-based materials are broadly attractive as a complement to inorganic materials due to their relative ease of fabrication, mechanical flexibility, and the ability to tune molecular properties. These benefits have been slow to accrue to the fields of spintronics and magnonics due to the combined challenges of interfacing organic and inorganic materials and the lack of “native” organic or organic-based magnetic materials with suitable DC and microwave magnetic properties. Here I will present a series of recent breakthroughs in the synthesis, device integration, and measurement of organic-based magnets that lay the foundation for all organic spintronic magnonic devices. I will discuss advances in encapsulation strategies that allow direction integration with microwave devices, the use of ligand substitution to generate a library of related magnetic materials, the growth of all-organic and hybrid organic/inorganic magnetic heterostructures, and measurements of ferromagnetic resonance (FMR) linewidths of ~ 0.7 Oe, superior to comparable thin films of yttrium iron garnet (YIG). Finally, we demonstrate the potential for real world applications in the construction of a V[TCNE]2 based spin-wave resonance device with spectral tuning from 1 – 5 GHz and a quality factor in excess of 3,200 that operates under ambient conditions. These results pave the way to both a dramatic increase in the design space of traditional microwave devices and the development of novel coherent magnonic structures.