Abstract
Magnetoresistance measurements on single-crystal nickel and iron films have been made at temperatures of 4.2 to 295 K in fields of up to 50 kOe. The films were prepared by vacuum deposition onto heated rock salt and mica substrates producing films with (100) and (111) planes respectively, parallel to the film surface. The films varied in thickness from 500 Å to 5 μ and had resistivity ratios, ρ295/ρ4.2, varying from 9 to 55. Transverse magnetoresistance curves taken at 295 K show crystalline anisotropies similar to those observed in bulk samples. At lower temperatures, the normal positive magnetoresistance is obtained, but anisotropies associated with the Fermi surface topology are not as marked as with bulk samples, due to the lower electron mean free paths of the electrons in film specimens. Both longitudinal and transverse magnetoresistance hysteresis curves were obtained for (100) nickel and iron films. An increased coercive force is obtained as the temperature is reduced for both nickel and iron films.
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