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Measurement of Maximum Remanence Field H(sr)

IP.com Disclosure Number: IPCOM000096863D
Original Publication Date: 1963-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Wellbrock, AG: AUTHOR

Abstract

The maximum remanence field H(sr) can be quickly and accurately obtained. This is where, in the magnetic material being tested, the ratio of the remanence magnetization (magnetic moment per unit volume) M(r) to the saturation magnetization M(s) remains constant for significant values of field H applied, H(a). The curve saturation magnetization M(s) versus the field Ha then can be substituted for the remanent magnetization M(r) versus the field H(a). The saturation magnetization M(s) and the field H(a) can be obtained by rectifying the magnetization M and field H signals obtained from an AC magnetometer in a peak detector and plotting the values on an x-y plotter.

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Measurement of Maximum Remanence Field H(sr)

The maximum remanence field H(sr) can be quickly and accurately obtained. This is where, in the magnetic material being tested, the ratio of the remanence magnetization (magnetic moment per unit volume) M(r) to the saturation magnetization M(s) remains constant for significant values of field H applied, H(a). The curve saturation magnetization M(s) versus the field Ha then can be substituted for the remanent magnetization M(r) versus the field H(a). The saturation magnetization M(s) and the field H(a) can be obtained by rectifying the magnetization M and field H signals obtained from an AC magnetometer in a peak detector and plotting the values on an x-y plotter. the value of the field h(sr) required for any desired percentage, such as 95%, of the maximum remanence field H(sr) can be readily obtained from the plotted curve.

The magnetic sample to be measured is inserted within AC magnetometer 1.
A. series of magnetic fields are applied to the magnetic tape sample in magnetometer 1. The field H and magnetization M in the form of electrical signals are the outputs of magnetometer 1. The field and magnetization signals are amplified in amplifier 2 and rectified in peak detector 3. The output of detector 3 is the field Ha and the saturation magnetization M. These values are applied to X-Y plotter 4 in which a graph is plotted for a wide range of fields H(a). The maximum remanence field H(sr) can then be read off the graph...