Magnetically tunable Maxwell fisheye lens for spin waves focusing

Abstract In this paper, a Maxwell fisheye lens (MFL) for spin waves (SWs) focusing on a ferromagnetic film was presented via micromagnetic simulation. The Maxwell fisheye lens with graded refractive index distribution, achieved with gradient saturation magnetization, is designed to manipulate the wavefront of spin waves. The simulation results show that sub-wavelength focusing can be achieved by means of MFL with appropriate chosen parameters. Furthermore, simulation results also prove that the focusing properties of MFL can be tuned by external magnetic field. The MFL would be promising device for SWs focusing and wavefront manipulation.