The temperature dependence of bubble-domain properties in YGdEu-, YGdEr-, YGdTm-, and YGdYb-garnets

Data are presented on the temperature dependence (from ∼ 0°C to 120°C) of the magnetization, characteristic length, and uniaxial anisotropy constant in LPE films of Y1.5Gd0.8Eu0.7Fe4.3Al0.6Ga0.1O12, Y1.0Gd1.0Er1.0Fe4.5Al0.3Ga0.2O12, Y0.9Gd1.5Yb0.6Fe4.5Al0.5O12, Y1.0Gd1.0Tm1.0Fe4.4Ga0.6O12, Y1.1Gd0.8Tm1.1Fe4.4Ga0.6O12, and Y1.2Gd0.6Tm1.2Fe4.4Ga0.6O12, Included are samples having a range of strain- and growth-induced anisotropies. We find that the magnetization can readily be made temperature independent from ∼20 to ∼100°C in these materials but that Ku, and hence , has a negative temperature coefficient. The variation of Kuwith temperature has an approximately exponential variation in all samples.