Application of Surface Coil for Nuclear Magnetic Resonance Studies of Semi-conducting Thin Films

摘要

We conduct a comprehensive set of tests of performance of surface coils usedfor nuclear magnetic resonance (NMR) study of quasi 2-dimensional samples. Wereport ${^{115} \rm{In}}$ and ${^{31} \rm{P}}$ NMR measurements on InP,semi-conducting thin substrate samples. Surface coils of both zig-zagmeander-line and concentric spiral geometries were used. We compare receptionsensitivity and signal-to-noise ratio (SNR) of NMR signal obtained by usingsurface-type coils to that obtained by standard solenoid-type coils. Asexpected, we find that surface-type coils provide better sensitivity for NMRstudy of thin films samples. Moreover, we compare the reception sensitivity ofdifferent types of the surface coils. We identify the optimal geometry of thesurface coils for a given application and/or direction of the applied magneticfield.