Fig. 1: Sketch of the experimental setup and the defect mode.
From: Simultaneous realization of nonreciprocal and ultra-strong coupling in cavity magnonics
a The 2D copper cylinder PC with a point defect of a YIG cylinder. All cylinders have a diameter of 5 mm and a height of 5 mm. The lattice constant is 20 mm. Two aluminum plates are applied to be the two-dimensional chamber with 5 mm of separation and surrounded by some microwave absorbing materials. Microwave signals are supplied by a VNA through two microwave cables with two antennas. The static magnetic field is applied in the z direction. b Experimental data. Microwave transmission coefficients S21 of the PC and YIG defect PC as a function of frequency without applied magnetic field. c and d represents the simulation result (by the finite element method) of the strength of microwave magnetic field distribution along z direction of the PC and YIG defect PC at 11.03 GHz, respectively. Black circle stands for the position of the YIG cylinder.
