Abstract
We introduce a theoretical model presenting a PT-symmetric system of two planar coupled magnonic ferromagnetic (FM) waveguides covered by thin layers of nonmagnetic metal with a strong spin-orbit interaction [heavy metal (HM)]. The eigenvalues in PT-symmetric systems change from real to complex at exceptional points. In magnonics, PT symmetry is achieved by a perfect balance of the gain and loss of spin waves. It is possible to control the voltage of exceptional-point appearance in the system by changing the distance between waveguides. The proposed system has a resonance linewidth almost 2 times narrower than that of a single FM-HM heterostructure, thus opening up opportunities for creating highly precise tunable devices, such as detectors and sensors.
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