Variable magnetostatic wave delay lines

Abstract

Theory which predicts the behavior of magnetostatic volume wave propagation in yttrium iron garnet films with the magnetic bias field applied at an arbitrary angle was developed. Measurements performed with the bias field applied in the plane transverse to the propagation direction and the plane defined by the film normal and the direction of propagation, yielded results which were in good agreement with the theory. A variable nondispersive delay line, obtained by varying the direction of the bias field applied to an approximately constant forward volume wave delay line, was demonstrated. The time delay of this device was adjustable over a ±20% delay range and had a bandwidth of ∼150 MHz at x band.

Generation of dense spin-wave soliton trains in active ring resonators

“…Note that, despite the calculated dispersion curves do not show any peculiarities at k approaching to 0, the modulus of the transmission coefficient exhibits a significant decrease at the corresponding frequencies, which leads to a good separation of the FVSW and BVSW bands in the frequency space. The presence of this transmission notch is typical for the studied configuration 17,18 and is, most probably, associated with an inefficient excitation of long-wavelength spin waves by the microstrip antennas.…”

“…The dispersion curves for both of them start at the frequency of the ferromagnetic resonance at k = 0 but, with increasing k, the frequency of FVSW increases, whereas the frequency of BVSW decreases. For intermediate angles 17,18 FVSW and BVSW can coexist and, varying e , one can control their group velocities. In fact, in the discussed geometry it is not possible to make the group velocities of the two types of waves to be equal, but for certain values of e the group velocity of BVSW can be a multiple of that of FVSW, which allows a synchronization of their propagation.…”

“…The experimentally measured dispersion characteristics were fitted by theoretical ones cal-culated using the theory developed in Ref. 17. The results of these calculations are presented in Fig.…”