C.D. Graham

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We report simultaneous measurement of magnetostriction and magnetization on strip samples of polycrystalline Hiperco 50 (49Fe 49Ni 2V, wt%) in fields of more than 300 Oe and over the temperature range from room temperature to 700degC. As a physical process, magnetostriction is clearly dependent on the state of magnetization of the sample, not on the applied(More)
Magnetic measurements made under closed-circuit conditions are generally considered to be free from errors associated with the image effect. However, magnetic measurements on permanent magnet sample cylinders clamped between the pole pieces of an electromagnet show an apparent drop in magnetization with increasing applied field that is similar to the image(More)
Demagnetizing factors for disk samples of a commercial 80Ni permalloy have been measured using a vibrating sample magnetometer with fields provided by a Helmholtz coil pair. The range of values of m (diameter/thickness) is from 12.5 to 385. The experimental values of N are significantly higher than those calculated for an ellipsoid, but lower than those(More)
The saturation magnetostriction of commercial, polycrystalline sheet samples of Fe-Co alloys containing 15, 27, and 50 wt% Co has been measured from room temperature to 700/spl deg/C, using a laser beam plus photodiode method. All three alloys show substantial magnetostriction at the highest measured temperature. The 27% and 50% Co alloys show a broad(More)
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