Observation of enhanced magnetic anisotropy in PLD YIG thin film on GGG (111) substrate

Magnetic properties and FMR of pulsed laser deposited Y3Fe5O12 (YIG) thin film on Gd3Ga5O12 (1 1 1) substrate have been investigated in the temperature range 4.2 <= T <= 300 K. The effective saturation magnetization (47 pi M-eff), obtained from Ferromagnetic Resonance at room temperature, is found to be 2600 G, which is higher than SQUID measured 4 pi M-s value of 1770 G. This implies that the value of 47 pi M-eff can only be accounted by considering a negative anisotropy field (H-U) of around 830 Oe at room temperature. Such an anisotropy is attributed to a compressive stress (-1.70 x 10(10) dyne/cm(2)) induced in the film closer to the film-air interface. The presence of this stress in YIG film was confirmed using multiple {hkl} stress measurements with grazing incidence X-ray diffraction performed at different depth of penetration on the YIG film.