ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The saturation magnetization Ms, the growth-induced uniaxial anisotropy constant Kgu, and the Faraday rotation θF, of [111]-oriented epitaxial iron-garnet films of composition Eu3−xBixFe5O12 with x≤1.3, have been investigated as a function of composition and temperature, and, have been compared with bismuth-free films of composition Eu3−xLuxFe5O12 and Eu3−uPbuFe5O12 with u≤0.124. The results indicate a strong dependence of Kgu on growth direction, lead and bismuth content, and growth parameters, which are associated with the noncubic occupancy of the Bi3+, Pb2+, and Eu3+ ions. A maximum Kgu value of 8×104 J m−3 occurs for x=1.3 and T=4.2 K. The temperature dependence of Kgu for bismuth-substituted films is interpreted in terms of the calculated Eu3+ and the Bi3+-Fe3+ contributions. At λ=633 nm and T=295 K, the lead- and bismuth-induced Faraday rotations ΔθF/u and ΔθF/x are −1.1×106 and −2.06×106 deg m−1, respectively, in good agreement with results reported for other rare-earth garnets. These data confirm the result that ΔθF/x is independent of the rare-earth ion.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.341108
