By Topic

Thermodynamics of post-erasure signal effect in γ-Fe2O3magnetic recording tapes

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Salmon, O. ; St. Paul, Minnesota. ; Fayling, R. ; Gurr, G. ; Halling, V.

Some γFe2O3-based magnetic recording tapes, particularly those using larger particle size γFe2O3, tend to retain a low-level or latent residual recorded signal after erasure with a large alternating magnetic field. The residual signal effect increases with time and temperature of storage after recording. The effect varies with the FeO content of the γFe2O3particles, and is a maximum at an FeO content of about 10 percent by weight. An explanation is presented of the phenomenon in terms of migration of cation vacancies from the interior of a magnetic domain to a domain wall in a magnetized γFe2O3particle thereby decreasing the free energy of the system. This sets up concentration gradients of Fe2+ions in regions of domain walls which remain after demagnetization of the tape and results in some residual magnetization. Reasonable agreement is obtained between calculated and observed residual magnetic effects as a function of FeO content.

Published in:

Magnetics, IEEE Transactions on  (Volume:15 ,  Issue: 5 )