Abstract
It is found that a large orthorhombic anisotropy is induced in (EuBi)3Fe5O12 garnet films grown on (110) NdGG substrates. The Bi content is controlled by controlling the melt composition and the supercooling temperature. Gyorgy's parameter B=−2(Ku+Kp) increases linearly with the Bi content. The main part of B is found to be growth-induced. Gyorgy's parameter A=Kp−Ku is very small and almost independent of the Bi content. The growth- and stress-induced parts of A are found to be considerably large, but of opposite sign, and to compensate each other nearly completely, although their respective absolute values increase with increasing Bi content.
Magnetic properties of a (Eu1.8 Bi1.2) Fe5O12 film are obtained as follows: saturation magnetization 4πMs = 1560 Gauss, uniaxial anisotropy Ku = 1.6 × 105erg/cm3, in-plane anisotropy Kp = 1.6 × 105erg/cm3, quality factor Q = 1.7, material length l = 0.06 μm and wall mobility μw = γΔ0/α = 19 ms-1. Such a film might be used as a 0.5 μm bubble material for current access devices.
