Growth and properties of high-Curie-temperature Sr2CrReO6 thin films

Asano, H.; Kozuka, N.; Tsuzuki, A.; Matsui, M.
July 2004
Applied Physics Letters;7/12/2004, Vol. 85 Issue 2, p263
Academic Journal
Thin films of ordered double-perovskite Sr2CrReO6 have been grown epitaxially onto SrTiO3 substrates by sputtering, and their microstructural, electrical, and magnetic properties are investigated. It is found that a wide growth-temperature range of at least 700–800 °C can yield epitaxial films with superior magnetic properties and atomically flat surfaces. These films exhibit Curie temperatures Tc of up to 620 K, and saturation magnetizations Ms of 0.9μB/formula unit (f.u.), which is comparable to the predicted value of 1μB/f.u. for the fully ordered half-metallic material. Owing to the wide temperature window for growth of high-quality films, the surface morphology and coercivity of Sr2CrReO6 films are highly controllable, which is favorable for fabrication of magnetic tunnel junctions.


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