Magnetooptic properties of bismuth-substituted ferrite–garnet films in strong pulsed magnetic fields

A technique of measuring the rotation of the light polarization plane in pulsed magnetic fields with strength up to 40 T with a sensitivity of $\sim$0.1$^{\circ}$ is proposed. The Faraday effect has been studied in films of diluted ferrites–garnets (Lu,Bi)$_3$(Fe,Ga,Al)$_5$O$_{12}$ in the temperature range from room temperature to 78 K, including the vicinity of the magnetic moment compensation temperature. The transition to the noncollinear phase in the magnetic phase diagram is shown to occur at a magnetic field strength higher than 30 T at room temperature, and the threshold transition field tends to zero when approaching the magnetic moment compensation temperature.