Temperature evolution of pseudo magnetic properties and vortex state in Fe71Ga29 thin films.

• Temperature effect on minor loop parameters and magenetostatic interactions on Fe 70 Ga 30 thin film. • Increase in grain size leads to decrease in energy loss coefficient W F 0 and trough depth coefficient W R 0. • Evidence for the coexistence of multidomain and Vortex State (VS) in all the FeGa thin films from FORC. We report on the temperature evolution of pseudo magnetic properties and vortex state in Fe 71 Ga 29 thin films at different substrate temperatures (RT-25 °C, 50 °C, 75 °C, and 150 °C) using minor loop analysis and first-order reversal curves respectively. Phase purity of Fe 71 Ga 29 thin films confirmed with grazing incidence X–ray diffraction, which confirms the A2-type disordered phase. The minor loop parameters such as energy loss coefficient W F 0 (362 kOe.emu/cc to 278 kOe.emu/cc) and trough depth coefficient W R 0 (67.30 kOe.emu/cc to 50.23 kOe.emu/cc) values drop as grain size increases due to a reduction in defects as a result of an increase in substrate temperature. First-order reversal curves allow us to estimate the coercivity variation and switching field distribution that allow us to get information about magnetic interactions between the domains. Additionally, the contour plots of FORC and MFM phase images infer the coexistence of multidomain and Vortex State (VS) in all the Fe 71 Ga 29 thin films deposited at different substrate temperatures. [ABSTRACT FROM AUTHOR]