By Topic

Feasibility of Differential Dual Spin Valve for 10 {\rm Tb/\in}^{2}

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
$33 $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

5 Author(s)
G. C. Han ; Data Storage Institute, (A*STAR) Agency for Science, Technology and Research,, Singapore ; L. Wang ; J. J. Qiu ; V. Ko
more authors

A conventional read head with the sensor embedded between two magnetic shields would hit the wall to provide a resolution required for a bit length less than 10 nm. A differential dual spin valve (DDSV) is proposed as an alternative for recording density of 10 Tb/in2. Our simulation results show that a DDSV can work well for a bit length down to 4 nm without magnetic shields. An excellent differential effect for a DDSV was achieved under a uniform field. Two resistance transitions are observed due to the inconsistent switching of free layers of the two spin valves. The inconsistent switching results from the interlayer coupling and its effect on DDSV performances can be eliminated by applying a vertical bias field. Signal to noise ratio (SNR) of a DDSV reader is analyzed mainly based on the mag-noise. We show that the mag-noise may not be a crucial limiting factor of SNR, because of the relative high available field at 10 Tb/in2 and thicker free layer in the DDSV reader. The specifications of the DDSV reader for 10 Tb/in2 are also derived. Our results demonstrate that the DDSV reader is very promising for 10 Tb/in2 applications.

Published in:

IEEE Transactions on Magnetics  (Volume:46 ,  Issue: 6 )