The phenomenon of wave front reversal (WFR) was discovered and investigated in detail for the case of isotropic and reciprocal media, when the properties of waves do not depend on the direction of propagation. In this case the reversed wave represents an exact copy of the incident (signal) wave, has the same frequency, but propagates in opposite direction [1]. The situation is absolutely different in non-reciprocal media: in this case the reversed wave with the signal frequency even can not exist. For the first time WFR of non-reciprocal surface magnetostatic waves (SMSW) was investigated in [2]. In that work non-metallized ferromagnetic film was used and the dispersion relations for the direct and reversed waves were identical. Even in that case, however, distributions of microwave magnetizations of waves were non-reciprocal, which resulted in significant modification of efficiency of WFR.
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