A novel instrument for measuring the magnetic moment of a small specimen of material is formed by applying AC techniques to the traditional force magnetometer (or Faraday magnetometer). The action of the instrument is analysed and an attempt is made to mention all the sources of error and practical difficulty that arise. The new instrument is closely related to the well known vibrating sample magnetometer (although they are at first sight quite different), so the discussion of the new instrument serves also as a discussion of the VSM. A constructed instrument having a sensitivity of 0.2 nA m 2 is described.
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R. Reeves (1972) studied this question.
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