New Bi-Based Garnet Films for Magnetic-Bubble Devices with Magneto-Optic Applications

LPE films of ${\mathrm{Bi}}_{\mathrm{x}}{\mathrm{Tm}}_{\text{3−}\mathrm{x}}{\mathrm{Ga}}_{\mathrm{y}}{\mathrm{Fe}}_{\text{5−}\mathrm{y}}{\mathrm{O}}_{12}$ have been grown strain‐free on (111) ${\mathrm{Gd}}_3{\mathrm{Ga}}_5{\mathrm{O}}_{12}$ substrates. Films with $\mathrm{x}\text{\hspace{0.17em}≃\hspace{0.17em}0.6}$ , $\text{0.8<}\mathrm{y}\text{<1.2}$ have relatively stable temperature characteristics, adequate mobility and are compatible with densities of 10⁶–10⁷ bits per square inch. The Faraday rotation is ten times higher than in the conventional bubble garnets, making these Bi‐based films suitable for bubble devices with magneto‐optic applications.