Abstract
FOR low saturating magnetic fields, the magnetoresistive effect in a polycrystalline ferromagnet is described by the relation1 : 
where ΔR0 is the positive resistance change measured when the electric current i is oriented first normal then parallel to the saturation magnetization M
s ; and ϕ is the angle between the current and the induction. This relation has been verified for evaporated nickel films by Rappeneau2.
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References
Bozorth, R. M., “Ferromagnetism”, 754 (Van Nostrand Co., New York, 1951).
Rappeneau, T., C.R. Acad. Sci., Paris, 246, 571 (1958).
Smith, D. O., Conference on Magnetism and Magnetic Materials, Boston, October 1956 (Amer. Inst. Elect. Eng., 625 (Feb. 1957)).
Smith, D. O., J. App. Phys., 29, 264 (1958).
Hellenthal, W., Z. Naturforsch., 14, a, 1077 (1959).
Bradley, E. M., and Prutton, M., J. Electronics and Control, 6, 81 (1959).
Prutton, M., Phil. Mag., 4, 1063 (1959). Dr. Prutton has independently arrived at a similar description of the transverse magnetization process (private communication).
Harte, K. J., J. App. Phys., 31, 283S (1960).
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WEST, F. Magnetoresistive Measurements on Domain Rotation in Nickel - Iron Alloy Films. Nature 188, 129–130 (1960). https://doi.org/10.1038/188129a0
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DOI: https://doi.org/10.1038/188129a0
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