•  
  •  
 

Document Type

Research

Abstract

Films of iron from 100 to 200 millimicrons thick deposited electrolytically from neutral and acid solutions of iron ammonium sulphate show a surprising magnetic hardness. At a field of 40 gauss the intensity of magnetization is from 200 to 300 c.g.s. units. No sudden increase in magnetization is found up to fields of 150 gauss. Films deposited on the initial film, using much smaller current densities than that required for the initial deposit, show the usual properties of electrolytic iron. An intensity of magnetization of 1000 is reached at 40 gauss field. The cause of the hardness of the initia1 films is not apparent. The great thickness at which it occurs in comparison with Maurain's critical thickness renders unlikely the assumption of a pure "thinness" effect. It may be due to the occluded hydrogen, though it does not seem likely that much hydrogen is occluded since (1) a heat treatment in carbon dioxide of several hours at 250°C changes the magnetic properties not at all, (2) the films are permanent in time in magnetic properties and do not rust.

Publication Date

1926

Journal Title

Proceedings of the Iowa Academy of Science

Volume

33

Issue

1

First Page

248

Last Page

249

Copyright

© Copyright 1926 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.