Specific resistance of Pd/Ir interfaces

Acharyya, R.; Nguyen, H. Y. T.; Loloee, R.; Pratt, W. P.; Bass, J.; Wang, Shuai; Xia, Ke
January 2009
Applied Physics Letters;1/12/2009, Vol. 94 Issue 2, pN.PAG
Academic Journal
From measurements of the current-perpendicular-to-plane total specific resistance (AR=area times resistance) of sputtered Pd/Ir multilayers, we derive the interface specific resistance, 2ARPd/Ir=1.02±0.06 fΩ m2, for this metal pair with closely similar lattice parameters. Assuming a single fcc crystal structure with the average lattice parameter, no-free-parameter calculations (including only spd orbitals) give for perfect interfaces 2ARPd/Ir (perf)=1.21±0.1 fΩ m2, and for interfaces composed of 2 ML of a random 50%-50% alloy 2ARPd/Ir (50/50)=1.22±0.1 fΩ m2. Within mutual uncertainties, these values fall just outside the range of the experimental value. Updating to add f-orbitals gives 2ARPd/Ir (perf)=1.10±0.1 fΩ m2 and 2ARPd/Ir (50-50)=1.13±0.1 fΩ m2, values now compatible with the experimental one. We also update, with f-orbitals, calculations for other pairs.


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