Domain wall states in annealed low Q garnet films

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Abstract
This paper reports on the lowering of Q by thermal annealing and its effect on hard bubble suppression, control of bubble states, and reduction of coercivity. Garnet films of nominal composition Y2.35Eu0.65Ga1.2Fe3.8O12 were annealed in either nitrogen or oxygen atmospheres. Annealing in N2 at 1250°C yields almost identical reduction in Q value of a film as annealing in O2 at 1350°C for the same length of time. Annealing in O2 at 1350°C for 50 min. and 100 min. reduces Q from about 6 to 3 and to 1, respectively. After the first 50 min. annealing, the coercivity is reduced from 0.12 to 0.04 Oe. Hard bubble suppression is obtained when Q?2.1 in films approximately 4 micron thick and at higher Q values in thicker films. Using bubble translation we have observed that bubbles generated by the pulse modulated bias field are mostly S=1 in low Q films. S=0 bubbles can be reliably generated in these film with the application of an in‐plane magnetic field together with pulse modulated bias field.

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