A Hysteresigraph for Plotting Magnetization Curves
Technical rept. 1 Jul-31 Dec 1966
DAYTON UNIV OH RESEARCH INST
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The objective of this study is to design, build, and calibrate a hysteresigraph for plotting magnetization curves of small cylindrical rod samples of dilute fine particle magnets. The magnetization of the sample and the field near its surface are measured with a set of balanced sensing coils. The voltages induced in these coils when the magnetic field is slowly changed are amplified and integrated electronically by means of two operational amplifiers Miller integration, whose outputs drive an X-Y recorder. The instrument must record hysteresis loops at peak field strengths up to 20,000 Oe with the expected values of coercive forces ranging from 100 to 10,000 Oe. The peak induction values may be expected to be in the range from 300 to 22,000 Gauss. The instrument has been used to measure hysteresis loops of various permanent magnets, and coercive forces of powdered rare earth-cobalt alloys which are under development as new magnetic materials.
- Test Facilities, Equipment and Methods
- Recording and Playback Devices