## Abstract

Expressions are developed for the internal efficiencies of magnetoelastic Rayleigh-wave convolvers. A bulk-wave formalism is used to express the nonlinear magnetization components m responsible for the convolution, as the square of the input signals S_{1} and S_{2}, i.e., m=η (S _{1}+S_{2})^{2}. The resulting expressions for η have a resonance-type denominator of the form ω^{2}- ω^{2}_{0}, where ω_{0} is the gyrofrequency. Such a resonance does not occur with surface magnetoelastic waves. The results are adapted to the surface-wave case by means of an approximation to estimate the nonzero value of the denominator. Experimental values of η range from 1.2×10^{5} to 4.7×10^{5} Wb/m^{2} for the best convolvers reported to date. Corresponding theoretical values range from 9.5×10^{4} to 1.58×10^{5} Wb/m^{2}. Uncertainties in the experimental and theoretical estimates are discussed.

Original language | English (US) |
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Pages (from-to) | 2684-2688 |

Number of pages | 5 |

Journal | Journal of Applied Physics |

Volume | 49 |

Issue number | 5 |

DOIs | |

State | Published - 1978 |