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Small bubble garnet films with collapse-field temperature coefficients ranging from -0.3 to about 0%/°C

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3 Author(s)
Yamaguchi, K. ; Fujitsu Labs Ltd., Kawasaki, Japan ; Uchishiba, H. ; Suzuki, T.

It is confirmed that collapse-field temperature coefficientsDeltaH_{o}(T)of conventional YSmLuCaGeIG (SL) films varied in the range of -0.1 ∼ -0.3 %/°C in proportion to the molar ratio of Lu2O3/Sm2O3in the melt composition.DeltaH_{o}(T)of the SL system was found to be limited in the range of -0.21 ∼ -0.3 %/°C when considering the lattice parameter matching between GGG substrates and films. To obtain garnet films withDeltaH_{o}(T)of less than -0.2 %/°C, Er and Gd substituted garnet films were studied. YSmErGdLuCaGeIG films withDeltaH_{o}(T)of -0.10 %/°C and an YSmErCaGeIG films of -0.06 %/°C were obtained. From the resulting ofDeltaH_{o}(T)and saturation magnetization temperature coefficientDeltaM_{s}(T), it was derived thatDeltaM_{s}(T)accounts for most of theDeltaH_{o}(T).

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Magnetics, IEEE Transactions on  (Volume:16 ,  Issue: 5 )