Abstract

The effect of heat treatment on magnetic rotation in sputtered cobalt films. The films were prepared in a special depositing chamber, the main feature of which was an arrangement for keeping the films cool during the process of sputtering.

Magnetic rotation measurements were made over the wavelength range .6μ to 2.3μ on such cathodically sputtered cobalt films before and after heating for a number of hours at about 300°C in low pressure palladium-pure hydrogen. The result of this heat treatment was to increase several-fold the rotations at 2μ for both the Faraday (transmission) and Kerr (reflection) effects, while towards the visible the change was small.

Conclusions drawn from this are based on the assumption that heat treatment coalesces the granules of which the film is composed into larger units. Then since the magnetic rotation is seen to depend on the size and character of the particles, it should be regarded in this case as a molar rather than molecular or atomic property, the effects being determined by conducting electrons even for wavelengths as short as 1μ.

Experiments on a nickel film and on colloidal iron yielded results in agreement with this conclusion.

© 1924 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Kerr Magneto-Optic Effect in Thin Cobalt Films*

J. M. Ballantyne
J. Opt. Soc. Am. 54(11) 1352-1353 (1964)

Faraday Rotation in FeNi Films

H. H. Wieder and D. A. Collins
Appl. Opt. 2(4) 411-420 (1963)

Faraday rotation of cobalt ferrite nanoparticle polymer composite films at cryogenic temperatures

Veysi Demir, Palash Gangopadhyay, Robert A. Norwood, and Nasser Peyghambarian
Appl. Opt. 53(10) 2087-2092 (2014)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription