Saturation remanence The default definition for remanence is the magnetization remaining in zero field after a large magnetic field is applied (enough to achieve saturation). A magnetic hysteresis loopis measured using instruments such as a vibrating sample magnetometerand the zero-field intercept is a measure of the remanence. In physicsthis measure is converted to an average magnetization(the total magnetic momentdivided by the volume of the sample) and denoted in equations asMr. If it must be distinguished from other kinds of remanence it is called thesaturation remanenceorsaturation isothermal remanence (SIRM)and denoted byMrs. In engineering applications the residual magnetization is often measured using aB-H Analyzer, which measures the response to an AC magnetic field . This is represented by a flux densityBR. This value of remanence is one of the most important parameters characterizing permanent magnets; it measures the strongest magnetic field they can produce. Neodymium magnets, for example, have a remanence approximately equal to 1.3 teslas.
Posted on: Sun, 16 Feb 2014 12:07:09 +0000
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