Dynamics of Spin Waves in 1D and 2D Magnonic Crystals of V[TCNE]_x~2 with YIG or Cobalt

A semiconducting organic ferrimagnet V[TCNE]_x~2 is a newly emerging magnonic material. Recent studies have revealed that V[TCNE]_x~2 has narrow linewidth, long spin lifetime and high Q factor[1-3]. In addition, deposition of high quality V[TCNE]_x~2 does not require specific substrates or high temperature which is a significant advantage compared to YIG[1]. These properties of V[TCNE]_x~2 indicate that it is attractive magnonic media. Here, we calculate and present the magnonic dispersions and linewidths of quasi one-dimensional and two-dimensional magnonic crystals consisting of V[TCNE]_x~2 with YIG or cobalt. In each case, we consider infinitely periodic lattice structures with a finite thickness. For the calculation, the linearized Landau-Lifshitz-Gilbert equation with the plane-wave method is used[4]. We anticipate that these results will provide fundamental understanding of how to design magnonic devices based on V[TCNE]_x~2.

[1] H. Yu et al. Appl Phys. Lett. 105, 012407 (2014)
[2] N. Zhu et al. Appl. Phys. Lett. 109, 082402 (2016)
[3] H. Liu et al. Nat. Mater. 17, 308-311 (2018)
[4] G. Sietsema, T. Liu, M. E. Flatté, SPIN, 7, 1740012 (2017)