It is important to look at the specific magnetic requirements in your sensor before specifying anything. In a variable reluctance sensor, where the operating point (load line) range of the magnet is probably pretty well defined, you will want to get a minimum Br which largely will define the...
My laboratory can measure B,H curves on magnetic materials. Let me know if we can help out. KJS Associates.
Magnetic Instrumentation, Inc.
www.maginst.com
Electrical resistivity of sintered ceramic ferrite magnets is typically around 10^+6 ohm-cm. Sintered Neodymium-iron-boron ("Neo" or "NdFeB") magnets have around 160x10^-6 ohm-cm resistivity. That's nearly 12 orders of magnitude difference! By comparison, the value for copper is about 1.7x10^-6...
The main reasons sintered ferrites are so difficult to shape are 1) they are very brittle and have a glass-like structure which makes for relatively poor mechanical strength, and 2) being ceramic materials they have very poor heat conductivity. That's why the water cooling is crucial. If you...
