![]() Since B = µH, it's a fair assumption if the material is air. There are times when saying that 1 oersted is like 1 gauss works out well. In some ways, you might argue that these things are really the same. The second half of our Magnet Grades article has a great step-by-step description about how these curves are measured. You can find BH curves for various magnet grades on our BH curves page. One axis of this curve is B (flux density expressed in gauss, comes from the magnet itself) and the other axis is H (the applied or external magnetic field in the magnetizing fixture, expressed in Oe). It describes how much field strength is required to magnetize a magnet, and more importantly for magnet users, how the magnet will perform. ![]() The demagnetization curve of a magnet material describes it magnetic properties. Historically and commonly, this field strength is expressed in A/m or Oe. The magnet is exposed to a magnetic field strong enough to magnetize the magnet. ![]() For a brief instant, a strong magnetic field is created by running a lot of electric current through the coil of wire. In practice, this means the magnet material is placed in a fixture, sitting inside a big coil of wire. When manufacturing permanent magnets, magnet material is magnetized by exposing it to an external magnetic field. Stick a magnetometer on the surface of this magnet and we'll measure magnetic flux (often called field strength). For example, a D82 disc magnet has a surface field of about 2,952 gauss. When we think about the "field strength" at the surface of a magnet (the Surface Field), we're looking for something expressed in gauss. How is this different than the flux density expressed in gauss or tesla? Why are there 2 different units? Are they the same thing? It is commonly expressed in amperes/meter (A/m) or oersted (Oe). There's another, somehow different unit for field strength.
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