He3 NMR with a 100 um Planar Nb Coil

Jaakko Koivuniemi, Mikko Kiviranta, Heikki Seppä, Matti Krusius

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    Abstract

    A superconducting 100 μm planar coil has been tested for low field cw NMR. The nine-turn 5 nH coil is connected via a planar 1:8 step-up transformer to an external parallel capacitor and resonated at 0.8 MHz to give a Q of 350.
    The tank circuit voltage is measured with a liquid He temperature GaAs MESFET preamplifier.
    Test experiments have been conducted by immersing the Si chip with the planar pick-up coil in liquid and solid 3 He to measure their cw NMR absorptions in the temperature range 0.05 – 0.5 K.
    Original languageEnglish
    Pages (from-to)255-260
    JournalJournal of Low Temperature Physics
    Volume110
    Issue number1-2
    DOIs
    Publication statusPublished - 1998
    MoE publication typeA1 Journal article-refereed

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