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The effect of film and interface structure on the transport properties of Heusler based current-perpendicular-to-plane spin valves

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7 Author(s)
Lazarov, V.K. ; Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom ; Yoshida, K. ; Sato, J. ; Hasnip, P.J.
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We present direct link between the transport properties of Co2MnSi and Co2FeMnSi Heusler based current-perpendicular-to-plane spin valves (CPP-SVs) and interface atomic structures resolved by aberration-corrected electron microscopy. The structure of the Co2FeMnSi electrodes is L21 but their interface with the CoSi spacer is disordered. In contrast to the Co2FeMnSi-electrodes, the Co2MnSi-electrodes have abrupt interfaces with the Ag spacer though their ordering is not fully L21. The magnetoresistance of the Co2MnSi-SV is over two orders of magnitude better than those of Co2FeMnSi-SV, demonstrating that the atomic interface ordering is crucial for the enhancement of the magnetoresistance in the Heusler CPP-SVs.

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Applied Physics Letters  (Volume:98 ,  Issue: 24 )