Abstract
Partially-oxidized-iron(Fe-O)-based magnetic tunnel junctions with large magnetoresistance have been fabricated. The compositions, and the structural and transport properties of the two Fe-O electrodes are characterized. The top Fe-O layer containing 25%–28% oxygen shows a metallic characteristic with fine grain structure. No crystalline iron oxides are detected in the layer. The bottom Fe-O layer whose surface was oxidized during the oxidation process of the Al layer reveals the formation of α-Fe2O3 at the surface. The α-Fe2O3(104) is likely to be epitaxially grown on the Fe(110) plane. The layer shows a nonmetallic transport feature with negative temperature coefficient of resistance.
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