"Thickness dependent characteristics of Single Crystalline Bi:YIG Thin Film grown with different orientation"

The Magneto-Optical (MO) properties are increases when bismuth (Bi) is substituted in the YIG (Bi_0.1Y_2.9Fe₅O₁₂ , BYIG). BYIG films of two different thickness were grown with different orientation ([111] and [100]) by pulsed laser deposition (PLD) technique over single crystalline Gadolinium gallium garnet (GGG) substrates. The BYIG grown with [100] orientation was observed structurally better with lesser strain (around 40% lesser). As the thickness of film decreases, the size of lattice parameter is also slightly decreases and it is more (by 0.073%) for the film grown over GGG having [111] plane. Larger ferromagnetic resonance (FMR) line width is observed in [111] directed film (100 Oe) as compared to [100] directed film (60 Oe) and also it decreases with the film thickness (100 Oe to 47 Oe in [111] and 60Oe to 39 Oe in [100] directed film). The value of net effective magnetization and Gilbert damping constant is observed to be increases with decrease in thickness of the film. The low Gilbert damping constant (1.53×10^-4, [100]) is observed as compared with (2.68×10^-4, [111]). Thus BYIG thin film grown on GGG along [100] direction shows better structural and magnetization characteristics and hence can be used for microwave devices such as microwave filter etc.