Measurement of the electron-spin susceptibility of Li, Cu, and Ag via transmission conduction-electron-spin resonance in metallic bilayers

A new technique is discussed which utilizes conduction-electron-spin resonance (CESR) in metal bilayers to determine the electron-spin susceptibility of metals. Transmission electron-spin resonance measurements are performed on bilayers made from various pairs of the metals lithium, sodium, potassium, copper, and silver. These measurements allow a determination of the ratio of the electron-spin susceptibilities of the two metals constituting the bilayer. Combining previously measured values of the electron-spin susceptibility of Na and K with our bilayer data, and performing a least-squares analysis, yields values of the electron-spin susceptibility of Li, Cu, and Ag. The resulting values are (2.29\ifmmode\pm\else\textpm\fi{}0.13)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$ cgs volume units for lithium, (1.35\ifmmode\pm\else\textpm\fi{}0.06)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$ cgs volume units for copper, and (0.86\ifmmode\pm\else\textpm\fi{}0.04)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$ cgs volume units for silver. These values agree with theoretical estimates and other experimental determinations. The self-consistency of our results also supports the reliability of our technique. This technique is potentially applicable to all metals for which CESR can be observed, and we discuss some possible candidates for future bilayer CESR susceptibility measurements.