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  • Title: Proximal magnetometry in thin films using betaNMR.
    Author: Xu M, Hossain MD, Saadaoui H, Parolin TJ, Chow KH, Keeler TA, Kiefl RF, Morris GD, Salman Z, Song Q, Wang D, MacFarlane WA.
    Journal: J Magn Reson; 2008 Mar; 191(1):47-55. PubMed ID: 18162424.
    Abstract:
    Low energy ion implantation of hyperpolarized radioactive magnetic resonance probes allows the NMR study of thin film heterostructures by enabling depth-resolved measurements on a nanometer lengthscale. By stopping the probe ions in a layer adjacent to a layer of interest, it is possible to study magnetic fields proximally. Here we show that, in the simplest case of a uniformly magnetized layer, this yields an unperturbed in situ frequency reference. We also discuss demagnetization contributions to measured shifts for this case. With a simple illustrative calculation, we show how a nonuniformly magnetized layer causes a strongly depth-dependent line broadening in an adjacent layer. We then give some experimental examples of resonance line broadening in heterostructures.
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