11:15 AM - MQ01.05.04
Dispersion Relations and Linewidths of 1D and 2D Magnonic Crystals of V[TCNE]x~2
Kwangyul Hu1,Michael Flatté1,2,3
University of Iowa1,University of Chicago2,Eindhoven University of Technology3
The ferromagnet yttrium iron garnet (YIG) has attracted a considerable attention for studying quantum magnonics for the advantages such as long spin lifetime , narrow ferromagnetic linewidth (FMR), low Gilbert damping constant  and high Q factor . However, a specific superlattice substrate gadolinium gallium garnet (GGG) is required to fabricate high quality YIG thin films , preventing the broad application of YIG such as with silicon. Recent studies have revealed that an organic based ferrimagnet, V[TCNE]x~2 is an excellent alternative to YIG. High quality V[TCNE]x~2 can be grown on various flexible substrates such as glass, quartz and Si wafer using low temperature CVD . This suggests that V[TCNE]x~2 is an attractive magnonic media with the same advantages as YIG [6-8].
Here, we present the dispersion relations and linewidths of quasi one-dimensional and two-dimensional periodic magnonic crystals of V[TCNE]x~2 calculated by using Landau-Lifshitz-Gilbert (LLG) formalism . For the one-dimensional magnonic crystals, periodic layers of two alternating materials is studied. For the two-dimensional magnonic crystals, we considered infinitely long cylinders embedded in a host material forming a square lattice periodic structure. In both cases, V[TCNE]x~2 combined with well known ferromagnets such as YIG and cobalt are considered. We focus on unit cells with a lattice constant of a=100nm in an external dipolar field of H0μ0=0.1T. Our results can be extended to investigate other properties of V[TCNE]x~2 such as spin wave propagation and their applications.
We acknowledge support from NSF EFRI NewLAW under Award No. EFMA-1741666.
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