Electrical Resistance of Nickel and Permalloy Wires as Affected by Longitudinal Magnetization and Tension

The changes in the electrical resistance of ferromagnetic metals in magnetic fields and under mechanical stresses are abnormal in comparison with such changes in non-ferromagnetic metals. Published results for nickel and nickel-rich alloys, reviewed in detail, show wider diversity than can be ascribed to accident. A full bibliography is included.Simple cases of these magneto-resistance and elasto-resistance effects have been studied in permalloys containing from 45 to 90 percent nickel. The results of two series of experiments, in 1923 and 1929, are presented, and show that both effects have, in these ferromagnetic alloys, the same origin. This common origin can be considered as the orientation, by one means or the other, of atomic magnetic axes associated in each atom with mechanical asymmetry.The connection between these resistance effects and magnetostriction is emphasized. Conclusions are drawn as to the kinds of re-orientation involved in magnetizing and as to the relative importance in the observable effects of intra-atomic and interatomic magnetic fields. Questions for further experiment are raised.

[1]  William Thomson,et al.  On the Electro-Dynamic Qualities of Metals:--Effects of Magnetization on the Electric Conductivity of Nickel and of Iron , 1856 .

[2]  G. Barlow.  On the effects of magnetisation on the electric conductivity of iron and nickel , 1903, Proceedings of the Royal Society of London.

[3]  W. E. W. B.Sc..  XLVIII. On the magnetic change of length and electrical resistance in nickel , 1902 .

[4]  W. Gerlāch.  Magnetische Widerstandsänderung und spontane Magnetisierung , 1930 .

[5]  W. L. Webster.  The longitudinal magneto-resistance effect in single crystals of iron , 1926 .

[6]  W. E. W. B.Sc..  LXXXV. The influence of stress and of temperature on the magnetic change of resistance in iron, nickel, and nickel-steel , 1903 .

[7]  D. Goldhammer.  Ueber den Einfluss der Magnetisirung auf die electrische Leitungsfähigkeit der Metalle , 1887 .

[8]  L. W. Mckeehan,et al.  Magnetostriction in Permalloy , 1926 .

[9]  F. Vilbig.  Über Widerstandsänderung verschiedener Metalle in Magnetfeldern , 1929 .

[10]  Herbert Tomlinson,et al.  I. The influence of stress and strain on the action of physical forces , 1883, Philosophical Transactions of the Royal Society of London.

[11]  A. B. Cardwell.  EFFECTS OF A CRYSTALLOGRAPHIC TRANSFORMATION ON THE PHOTOELECTRIC AND THERMIONIC EMISSION FROM COBALT. , 1929, Proceedings of the National Academy of Sciences of the United States of America.

[12]  J. Malam,et al.  LXXIII. The electrical resistance of nickel in magnetic fields , 1914 .

[13]  P. McCorkle.  Magnetostriction and Magnetoelectric Effects in Iron, Nickel and Cobalt , 1923 .

[14]  P. W. Bridgman.  The Effect of Tension on the Transverse and Longitudinal Resistance of Metals , 1925 .

[15]  W. E. Williams.  V. On the magnetic change of resistance in iron, nickel, and nickel-steel at various temperatures , 1905 .

[16]  P. Kapitza.  The Change of Electrical Conductivity in Strong Magnetic Fields. Part I. Experimental Results , 1929 .