Abstract
We report on the fabrication and characterization of magnetic tunnel junctions using the Heusler compound Co2MnGe as the bottom electrode and Co as counter electrode. The Co2MnGe phase in the cubic L21 structure belongs to the group of Heusler alloys with theoretically predicted full spin polarization at the Fermi level. From the maximum tunnelling magnetoresistance of 27% at low temperatures we derive a spin polarization P=36% for the Heusler alloy. We compare the properties of the Co2MnGe∕Al2O3∕Co junction with that of a Co∕Al2O3∕Co reference junction prepared under the same conditions and discuss the possible origin of the loss of full spin polarization for the Heusler alloy in the junction.
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