Abstract
We determined current-perpendicular-to-plane magnetotransport parameters: interface specific resistance $(2A{R}^{\ensuremath{\ast}})$ and scattering asymmetry $(\ensuremath{\gamma})$ for $F/\text{Al}$ ($F$: $\text{Py}={\text{Ni}}_{84}{\text{Fe}}_{16}$, Co, Fe, and ${\text{Co}}_{91}{\text{Fe}}_{9}$) interfaces. The derived values of $2A{R}^{\ensuremath{\ast}}\ensuremath{\sim}8.4--11.6\text{ }\text{f}\ensuremath{\Omega}\text{ }{\text{m}}^{2}$ are exceptionally large but those of $\ensuremath{\gamma}<0.18$ are small. Modest changes in sample resistances with aging and annealing indicated some changes in interfacial structure. We studied those changes in Co/Al and Py/Al multilayers, using high resolution transmission electron microscopy and electron energy loss spectroscopy. These techniques showed little, if any, differences in interfacial structure and width between unannealed and annealed multilayers and no evidence of intermetallic phase formation. The structural differences that cause the transport differences, thus, appear to be subtle.
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