Nuclear Magnetic Resonance in Ferromagnetic and Antiferromagnetic Alloys

摘要

The report concerns the initial stages of investigations into nuclear magnetic resonance in ferromagnetic materials. The resonances are observed in zero applied magnetic field, so that the experiments result in a value for the effective magnetic field at the nucleus. The types of apparatus used to observe nuclear magnetic resonance are briefly reviewed, together with the reasons for selecting a V.H.F. variable frequency, frequency modulated marginal oscillator. The marginal oscillators constructed are described, together with their limitations. A table of other reported nuclear magnetic resonances in ferromagnetic materials is given and it is shown empirically that for materials of large magnetic moment the resonant frequency is likely to be high. This has prompted the redesign of the coaxial line oscillator to operate in the U.H.F. range which is described in detail. (Author)