Hall Effect and Specific Resistance of Evaporated Films of Silver, Copper and Iron

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Abstract
Specific resistance and Hall coefficient of evaporated films, 20 to 200 μμ thick.—The specific resistances of films of silver, copper and iron were found to be from 15 to 57 times the values for the bulk metals, being respectively 24.3, 29.7 and 506 instead of 1.6, 1.8 and 8.8. The Hall coefficients of films of silver and copper, two diamagnetic metals, were respectively 41 and 11 per cent. less than the bulk values, while for the iron films the coefficient was +42.5 as compared with +6.6 for bulk iron, an increase of over 500 per cent. For the silver and copper films the Hall effect is proportional to the field throughout, but for iron films the proportionality extends only to 10,000 gausses, whereas the limit for bulk iron is 20,000 gausses. This indicates that the maximum intensity of magnetization in iron films is only half as great as that attainable in pure bulk iron.