Abstract
Experimental investigations of the amplified echo in the case of a homogeneously magnetized sphere have shown that the natural oscillations of a ferrite with wave number k between 10 and 7–104 cm−1 take part in the amplification process. In this connection, the production of an appropriate inhomogeneity of the internal magnetic field is necessary for the effective excitation of such oscillations, i. e., to obtain high gain coefficients. Thus, a system of two contiguous ferrite spheres with optimal orientation yield a 40 dB gain in the three centimeter waveband. A theory considering the parametric interaction between the magnetic moment vibrations in the echo mode and taking account of relaxation processes yields good agreement with experiment.
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Translated from Izvestiya VUZ, Fizika, No. 3, pp. 37–40, March, 1973.
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Danilov, V.V., Tychinskii, A.V. & Sugakov, V.I. On the nature of the amplified spin echo in garnets. Soviet Physics Journal 16, 316–319 (1973). https://doi.org/10.1007/BF00895418
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DOI: https://doi.org/10.1007/BF00895418