J. Phys. IV France 07 (1997) C1-497-C1-498
Investigations of Epitaxial Ga : YIG(111) Films by Brillouin Light Scattering and Microwave SpectroscopyJ.W. Boyle1, J.G. Booth1, A.D. Boardman1, I. Zavislyak2, V. Bobkov2 and V. Romanyuk2
1 Physics Department, University of Salford, Salford M5 4WT, U.K.
2 Radiophysics Department, Taras Shevchenko University, Kiev, 252017, Ukraine
Brillouin light scattering and microwave spectroscopy measurements have enabled the room temperature magnetic characteristics of five Y3Fe5-xGaxO12(111) films with 0≤x≤0.73 to be obtained. The film thicknesses ranged from 7 to 10 microns. The BLS measurements gave stiffness factors ranging from 5.52 to 8.77.10-9 Oe.cm2. This variation is attributed to the occupation by Ga atoms of the A and D sites causing a decrease in Jad. The values of 4πMs, and γ deduced were in good agreement with those obtained by microwave spectroscopy which examined the frequencies of the MSBVW and MSFVW excitations generated by a periodic array of microstrips. 4πMs decreased from 1.740 kG for x = 0 to 0.645 kG for x = 0.73. A cubic anisotropy field HK of ~45 Oe and first and second order uniaxial anisotropy fields Hu1 and Hu2 of ~-70 and 50 Oe respectively were obtained.
© EDP Sciences 1997