Abstract
We prepared Sr-ferrite films by heat treating spinel ferrite films containing 2at.% of Sr at 1123K for 1h under an oxygen pressure of 4×10−3Pa. The spinel ferrites were epitaxially grown on Al2O3 (00.1) substrates by electron beam deposition using Sr ferrite and SrO2 as sources. Data measured with a vibrating sample magnetometer revealed that the film exhibited a magnetic uniaxial anisotropy axis perpendicular to the film plane and the coercivity was 2.5kOe. Measurements with x-ray diffraction and electron diffraction revealed that the films were composites of Sr ferrites and hematites, and the Sr ferrites and hematites had epitaxially grown in the form of layers. The epitaxial relations between Sr ferrite, Fe2O3, and Al2O3 were [00.1]Srferrite‖[00.1]Fe2O3‖[00.1]Al2O3 and [1−1.0]Srferrite‖[11.0]Fe2O3‖[11.0]Al2O3.
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