Another way of enlarging the working surface is to modify the magnetic circuititself. As was mentioned in Sec. 3.2, in order to modify the magnetic circuit, thematerials used, the configuration of the magnetic circuit and the dimensional designparameters can be changed. Since there are not many material in the literature withknown (published) detailed magnetic properties, changing the material makes thesubsequent MRB design and analysis difficult. However, by modifying the configuration of magnetic circuit and changing the dimensional design parameters, magnetic
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