ABSTRACT
Chapter 4 addresses the hardware configuration of rotational magnetising systems. Hardware configuration of a rotational magnetising system depends heavily on the measurement method: mechanical, thermometric, wattmetric or fieldmetric. The size of the sample must match the size and shape of the magnetising yoke, which also imposes requirements on the configuration of magnetising coils, power amplifiers and control of the whole system. So the choice of size/shape is one of the first to be made when a new measurement system is designed and constructed. Many other features are also a consequence of this important decision. In recent years, majority of rotational magnetisation studies employed the fieldmetric technique. This is probably due to the relative robustness of the method which allows performing many tests with the same setup. For instance, measurements of properties under non-circular magnetisation (elliptical, DC-biased, vector properties) are much easier to obtain with the fieldmetric method. Signal analysis with this method also offers great robustness.
