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Article

Materials with thermally compensating properties for devices using magnetostatic waves

Journal of Advanced Materials. 2002. Vol. 9 (2). P. 167-172.
Bondarenko G.G., Shagaev V. V.

Results are presented of investigations of the temperature dependence of the frequency of the surface magnetostatic waves in the cubic ferrite film—permanent magnet system. Analy­sis made of the conditions of thermal stability of the frequency and the essential require­ments are proposed for the parameters of the film and the magnet. The results show that the best thermally compensating properties are typical of the films with the orientation {110} and magnets with positive temperature coefficients of spontaneous magnetisation. The experimental investigations were carried out on films of iron-yttrium garnet and magnets of (NdDy Tb Ho Gd) (Fe Co) В alloys. The temperature dependences of the frequencies from the longwave part of the spectrum were characterised by non-monotonic sections. At the maximum of the dependences, the temperature coefficients showed the zero value. The highest thermally stable frequency, 4.6 GHz, was recorded in the field with a strength of 1070 Oe and a temperature coefficients of 0.3 Oe/°C.