Samsung Advanced Institute of Technology

Organic-based magnetic materials have been used for spintronic device applications
as electrodes of spin aligned carriers and spin-pumping substrates.
Their advantages over more traditional inorganic magnets include reduced
magnetic damping and lower fabrication costs. Vanadium tetracyanoethylene,
V[TCNE]x (x ？ 2), is an organic-based ferrimagnet with an above room-temperature
magnetic order temperature (Tc ？ 400 K). V[TCNE]x has deposition
flexibility and can be grown on a variety of substrates via low-temperature
chemical vapor deposition (CVD). A systematic study of V[TCNE]x thin-film
CVD parameters to achieve optimal film quality, reproducibility, and excellent
magnetic properties is reported. This is assessed by broadband ferromagnetic
resonance (FMR) that shows most narrow linewidth of ？1.5 Gauss
and an extremely low Gilbert damping coefficient. The neat V[TCNE]x films
are shown to be efficient spin injectors via spin pumping into an adjacent
platinum layer. Also, under an optimized FMR linewidth, the V[TCNE]x films
exhibit Fano-type resonance with a continuum broadband absorption in the
microwave range, which can be readily tuned by the microwave frequency.