Abstract
New high g (gyromagnetic ratio) garnets for magnetic bubble applications have been found. In (La Tm Ca) 3 (Fe Ge) 5 O 12 films, g becomes larger than 20, and the saturation wall velocity exceeds 1800 m/s. The mechanism of high g 's in these garnets can be explained by high magnetic losses of rare earth ions in the garnet. It is concluded that high g garnets can be obtained by using not only Eu 3+ ion but also almost all magnetic rare earth ions except Gd 3+ .
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