By Topic

Exchange coupling and microstructure in annealed cobalt-rich amorphous alloys

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

3 Author(s)
Kim, C.K. ; MIT, Cambridge, MA, USA ; Ho, W.K. ; O'Handley, R.C.

Low-field magnetic properties have been measured in annealed ribbons of amorphous Co95-xFe5(BSi)x. The M-H loops show coercivities of order 100 mOe and weak but consistent exchange anisotropy of order 10 to 100 mOe. The direction of the field offset can be reversed by reversing the ribbons in the pickup coil or by applying a negative field of order 30 to 40 Oe. We have made an extensive microstructural investigation of these alloys to understand the origin and nature of the exchange-coupling component responsible for the offset. Annealing in air first causes surface oxidation to B2 O3 and SiO2 which reduces the glass-former content in the underlying amorphous material. Continued heating well below the bulk crystallization temperature results in premature crystallization of a layer of order 10 to 100 nm in thickness. The crystallization product is either fcc or hcp Co (plus solutes). The fcc cobalt is highly-faulted which seems to be necessary for the exchange anisotropy

Published in:

Magnetics, IEEE Transactions on  (Volume:31 ,  Issue: 6 )