Magnetic Properties of Amorphous Fe2O3-R2O3 (R=La, Gd and Tb) Thin Films Fabricated by Sputtering Method

Hirofumi Akamatsu; Shunsuke Murai; Koji Fujita; Katsuhisa Tanaka

doi:10.4028/www.scientific.net/AMR.39-40.207

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 39-40Magnetic Properties of Amorphous Fe2O3-R2O3 (R=La,...

Magnetic Properties of Amorphous Fe₂O₃-R₂O₃ (R=La, Gd and Tb) Thin Films Fabricated by Sputtering Method

Abstract:

Amorphous oxide thin films of Fe2O3-R2O3 (R = La, Gd and Tb) systems have been deposited on silica glass substrates by using a radio frequency sputtering method, and magnetic properties of the thin films have been examined. The Fe2O3-La2O3 thin films exhibit cusp-like maxima of dc magnetic susceptibility in their temperature dependences as well as magnetic aging and memory effects characteristic of typical spin glasses. For Fe2O3-Gd2O3 and Fe2O3-Tb2O3 systems, magnetic moments of iron ions take part in formation of a spin glass state, as indicated by the magnetic aging effects, while those of rare-earth ions remain to be in a paramagnetic state even at very low temperatures.