Critical Current Enhancement In Magnetic Spin-Transfer Nano-Devices Through Doping With The Rare Earth Terbium

Other Titles
Abstract

In this thesis, we fabricate magnetic nanopillars and dramatically enhance their damping through terbium doping in order to suppress the various spin-transfer effects, to the potential benefit of magnetic hard drive read head technology. This enhancement is much stronger at lower temperatures, and we can understand the 1/T temperature dependence observed through the application of established theory from the iron garnets. We also show that terbium doping can address technological problems with hard drive read heads. In particular, by inhibiting the microwave noise until a higher turn-on current is reached, without compromising the ability of the device to switch with reasonable power in times scales as short as 1 nsec, terbium-doped structures point the way forward for future designs. Finally, we make direct FMR measurements of the Gilbert phenomenological damping parameter at the center of these effects, and these measurements also suggest cobalt-iron alloys as systems for potential follow-up work.

Journal / Series
Volume & Issue
Description
Sponsorship
Date Issued
2012-08-20
Publisher
Keywords
spin-transfer; terbium; magnetic; hard drive read head; nanopillar; damping; temperature; doping
Location
Effective Date
Expiration Date
Sector
Employer
Union
Union Local
NAICS
Number of Workers
Committee Chair
Buhrman, Robert A
Committee Co-Chair
Committee Member
Van Dover, Robert B.
McEuen, Paul L.
Degree Discipline
Applied Physics
Degree Name
Ph. D., Applied Physics
Degree Level
Doctor of Philosophy
Related Version
Related DOI
Related To
Related Part
Based on Related Item
Has Other Format(s)
Part of Related Item
Related To
Related Publication(s)
Link(s) to Related Publication(s)
References
Link(s) to Reference(s)
Previously Published As
Government Document
ISBN
ISMN
ISSN
Other Identifiers
Rights
Rights URI
Types
dissertation or thesis
Accessibility Feature
Accessibility Hazard
Accessibility Summary
Link(s) to Catalog Record