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Bhoi, Biswanath
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article
Observation of enhanced magnetic anisotropy in PLD YIG thin film on GGG (1 1 1) substrate
Abstract
<p>Magnetic properties and FMR of pulsed laser deposited Y<sub>3</sub>Fe<sub>5</sub>O<sub>12</sub>(YIG) thin film on Gd<sub>3</sub>Ga<sub>5</sub>O<sub>12</sub>(1 1 1) substrate have been investigated in the temperature range 4.2 ≤ T ≤ 300 K. The effective saturation magnetization (4πM<sub>eff</sub>), obtained from Ferromagnetic Resonance at room temperature, is found to be 2600 G, which is higher than SQUID measured 4πM<sub>S</sub>value of 1770 G. This implies that the value of 4πM<sub>eff</sub>can only be accounted by considering a negative anisotropy field (H<sub>U</sub>) of around 830 Oe at room temperature. Such an anisotropy is attributed to a compressive stress (−1.70 × 10<sup>10</sup>dyne/cm<sup>2</sup>) 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.</p>