NDLI: Spin-Polarized Current Switching of Co/Cu/Py Elongated Pac-Man Spin-Valve

Content Provider	IEEE Xplore Digital Library
Author	Lyle, A. Yang-Ki Hong Byoung-Chul Choi Abo, G.S. Mun-Hyoun Park Sung-Hoon Gee Jalli, J. Seok Bae Donohoe, G.W.
Copyright Year	1965
Abstract	We investigated spin-polarized current switching of elongated Pac-man (EPM) elements in a Pac-man shaped spin valve (Co/Cu/Py). The aspect ratio, pulse duration, and effect of antiferromagnetic (AFM) layer were simulated to obtain coherent switching. Pulse duration was varied on the picosecond (ps) scale and showed that ultra-fast switching could be achieved. A critical aspect ratio of 4.2 was found, where a minimum current density was observed. For antiparallel to parallel (AP-P) switching, a vortex formed during the switching process for aspect ratios less than 7. Aspect ratios of 7 or higher did not form a vortex and showed similar current densities to parallel to antiparallel (P-AP) switching as a result. It was found that the AFM layer prevented the formation of a vortex at the critical aspect ratio of 4.2 and effectively changed the switching mechanism. This allowed coherent switching with current densities for AP-P and P-AP to be only 7% from each other at the aspect ratio of 4.2.
Sponsorship	IEEE Magnetics Society
Starting Page	2367
Ending Page	2370
Page Count	4
File Size	426658
File Format	PDF
ISSN	00189464
Volume Number	45
Issue Number	6
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic flux Current density Magnetic fields Magnetic switching Micromagnetics Physics Astronomy Space technology Spin valves Antiferromagnetic materials simulation Current MRAM Pac-man
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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