Researcher(s)
- William Neuschwender, Physics, SUNY Geneseo
Faculty Mentor(s)
- M. Benjamin Jungfleisch, Departments of Physics and Astronomy, University of Delaware
- Muhammed Tomal Hossain, Departments of Physics and Astronomy, University of Delaware
- Rawnak Sultana, Departments of Physics and Astronomy, University of Delaware
Abstract
Magnetic metamaterials such as synthetic antiferromagnets and nanomagnetic arrays show great promise as a means of exciting magnons for future applications. The samples investigated in this project include a tetra-layer synthetic antiferromagnet and a square lattice of strongly-interacting nanomagnets. Spin dynamics are experimentally detected by vector-network-analyzer-based ferromagnetic resonance (FMR) technique. For this purpose, the samples were placed at various locations on a microwave coplanar waveguide (CPW) to excite various magnon modes. By adjusting the angle of the external field with respect to the CPW, we are able to excite various magnon modes including optical and acoustic modes in the synthetic antiferromagnet. Furthermore, we find characteristic fingerprints of magnetic vortex and macrospin states in the spectra of the nanomagnet array. This will assist in furthering the understanding of how the orientation and geometry of nanomagnetic arrays affect magnon excitation. Likewise, FMR results show an initial proof of concept for the synthetic antiferromagnets with further Brillouin light spectroscopy (BLS) required for greater analysis.