Poster In-Person
26 Oct 2023
A spin wave(SW)/magnon based nanopatterned magnetic antenna, known as “Magnon Microwave Antenna”(MMA) [1] is operated in the microwave frequency range. Since the MMA are designed with magnetic nano-heterostructures[patterned magnetostrictive(MS) nanowire (NWs) arrays on piezoelectric (PE) substrate], the operation of MMA relies on interaction between phonons (from PE layer), magnon (from MS layer) and photons (electromagnetic radiation). When the MMA is placed in an alternating external electric field, a sinusoidal stress has been generated in PE layer, that travels along the surface of PE substrate and acts as surface acoustic wave (SAW). The developed SAW has then been transferred to the MS NWs which in turn excites the magnetization in the same to form collective SW excitations/magnons. Subsequently, the generated SWs further radiates photons at the SAW frequency and which can be used to transfer information and energy in the nanoscale regime[1],[2]. The MMA consists of 5 FeGa NWs patterned on LiNbO3 separated by distances = 40-160 nm and is designed in COMSOL[3] to obtain the SAW frequency. S11 and S22 parameters estimate the SAW frequency as 551.35 MHz, that propagates along the longitudinal direction. The micromagnetic simulations with MuMax3[4] are performed by discretizing NWs into cell sizes considering typical FeGa material parameters (MS=1.32MA/m, Aex=16pJ/m, Ku=0kJ/m3). Along with the Mx component, the associated power and phase profiles of the SWs at the 0.3 GHz frequency of s = 40 nm configuration are shown in Fig. 1 (a), (b) and (c), respectively. MX profile shows that the multidomains are formed along x-component due to the SAW excitation. The power profile shows that the 0.3 GHz SW mode is quantized in a complex pattern, while the phase profile at that frequency exhibits a complex propagation mode of the SW. We note that s=40 nm configuration has a distribution of four different magnetodynamical resonance modes, whereas for s = 90 nm configuration the phonon-magnon-photon coupling generates a single synchronized 0.56 GHz resonance microwave frequency. Funding support: SFI-21/FFP-A/10003-MERIT.References: [1] A. Samanta and S. Roy, “Generation of Microwaves With Tuneable Frequencies in Ultracompact ‘Magnon Microwave Antenna’ via Phonon-Magnon-Photon Coupling,” IEEE Trans. Electron Devices, vol. 70, no. 1, pp. 335–342, 2023. [2] R. Fabiha, J. Lundquist, S. Majumder, E. Topsakal, A. Barman, and S. Bandyopadhyay, “Spin Wave Electromagnetic Nano-Antenna Enabled by Tripartite Phonon-Magnon-Photon Coupling,” Adv. Sci., vol. 9, no. 8, p. 2104644, 2022. [3] A. B. COMSOL, “COMSOL Multiphysics Version 6.0.” 2022. [4] A. Vansteenkiste, J. Leliaert, M. Dvornik, M. Helsen, F. Garcia-Sanchez, and B. Van Waeyenberge, “The design and verification of MuMax3,” AIP Adv., vol. 4, no. 10, p. 107133, 2014.
