Abstract
We have observed giant magnetoresistance in spin valves using the PtMnSb Heusler alloy as either one or both of the two ferromagnetic component layers. Up to 0.5% MR has been measured in the CIP geometry in films consisting of (111) epitaxial PtMnSb grown on Al/sub 2/O/sub 3/ with Cu as a non-magnetic spacer and Co as the remaining ferromagnetic component. Attempts to pin the upper Co layer with the high coercivity ferromagnet Co/sub 80/Pt/sub 20/ helped decouple the magnetic layers but led to increased current shunting lowering the overall MR. We have also grown PtMnSb(111)/CuMnSb(111)/PtMnSb(111)/MnFe spin valves. Such spin valves showed a maximum GMR of 0.05%. We attribute this low value of MR to insufficient decoupling of the PtMnSb layers and possible interlayer mixing between the different Heusler alloys.
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