The distributions of magnetic fields H_y along the z direction with x = 0, where the external magnetic fields B = 0.02 T and incident angle is 60°. (a) f = 5.10673 GHz, the solid and dot lines represent positive incidence and negative incidence, respectively, (c) f = 5.22093 GHz, the solid and dot lines represent negative incidence and positive incidence, respectively.