Pulsed fields: generation, magnetometry and application

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Abstract
A survey is given of the different techniques for generating high magnetic fields at various time scales; the influence of the current distribution on the construction of a high field magnet is shown and the effect of the temperature rise as well as that of the forces is demonstrated. Magnetometry in pulsed fields is discussed by comparing different techniques; the influence of the construction of the pick-up system upon sensitivity is calculated. The value of a high field device is demonstrated on different selected results. Analysis methods which can be applied to high field magnetisation are also given. Different approaches are developed for the determination of the anisotropy of polycrystalline materials. Examples are the law of approach to saturation (LAS), the singular point detection technique (SPD) as well as field induced transitions (e.g. FOMP). For a band magnet the occurrence of a metamagnetic transition is demonstrated on materials like Co(SxSe1-x)2. In the case of ferrimagnetic systems various descriptions based on molecular field models are developed. The existence of a spin-flop transition is demonstrated even for polycrystalline materials by applying the theory graphically.