A New Measuring System for Determining the Magnetic Viscosity in Permanent Magnets

Abstract:

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A new system for measuring magnetic viscosity in bulk hard magnetic materials base on a pulsed field method is presented. After the magnetizing field pulse, the stray field of the sample, which is proportional to the magnetic moment, is measured with a compensated set of two Hall probes. The set of Hall probes is driven with an AC voltage source and the Hall voltage is detected using a lock-in amplifier. By this method the system is able to measure the time dependence of the magnetization (viscosity). The magnetic viscosity coefficient (S) is obtained through a linear fitting of the magnetization decay versus ln t. Two typical Nd-Fe-B samples were measured and good agreement with the results from the traditional viscosity experiment was obtained.

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Periodical:

Edited by:

S. Velumani and René Asomoza

Pages:

12-20

DOI:

10.4028/www.scientific.net/AMR.68.12

Citation:

J.H. Espina-Hernández et al., "A New Measuring System for Determining the Magnetic Viscosity in Permanent Magnets", Advanced Materials Research, Vol. 68, pp. 12-20, 2009

Online since:

April 2009

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$35.00

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