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A New Measuring System for Determining the Magnetic Viscosity in Permanent Magnets
- Source :
- Advanced Materials Research. 68:12-20
- Publication Year :
- 2009
- Publisher :
- Trans Tech Publications, Ltd., 2009.
-
Abstract
- 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.
Details
- ISSN :
- 16628985
- Volume :
- 68
- Database :
- OpenAIRE
- Journal :
- Advanced Materials Research
- Accession number :
- edsair.doi...........56986bf6312a07b25e5e95c4d1dab69a