The main advantage of MSW devices is the planar technology, diminutiveness and controllability by a magnetic field in a wide range of frequencies [1,2]. In spite of the evident advantages, the practical applications of the proposed devices were impeded by the problem of the frequency thermostabilization. In this work [3], we study the possibilities of self-compensation of the frequency’s temperature drift in spin-wave ferrite devices using reversible thermal demagnetization of permanent magnets. The normal magnetization of the YIG film are considered. The YIG film resonator was used for thermal stabilization. For a normal magnetization of isotropic YIG films, the film’s frequency of a fundamental mode is approximately equal to the lower frequency of the MSW spectrum. By application of different types of rare-earth magnets, a stabilization system was tuned to the desired thermostabilized frequency. Fig.1 demonstrates the experimental temperature dependence of the frequency for the oscillator based on the normal magnetized YIG film.
Fig1. Experimental results for the frequency of the YIG-tuned oscillator.
The proposed method provides increased thermal stability without using of complicated thermostat systems. This system can be widely used for planar spin-wave microwave devices.
[1] Castera J.P. State of the art in design and technology of MSW devices, Journal of Appl. Physics, 55, 2506-2511 (1984).
[2] J.D.Adam. A Temperature Stabilized Magnetostatic Wave Device, IEEE Proc.160-161 (1979).
[3] V. V. Tikhonov, A. N. Litvinenko, S. A. Nikitov, S. G. Suchkov. Temperature stabilization of spin-wave ferrite devices. Journal of Comm. Tech. and Electronics. 75-81 (2013).