NDLI: Spin Torque Writing for Next Generation MRAM

Content Provider	IEEE Xplore Digital Library
Author	Buhrman, R.
Copyright Year	2008
Abstract	Summary form only given. The initial predictions and subsequent definitive demonstrations of the ability of a spin-polarized current that impinges onto a thin film nanomagnet to reversibly switch the orientation of its magnetic moment, and/or to excite it into microwave precession, by the torque exerted through the transfer of spin angular momentum from the incident conduction electrons, have catalyzed what is now a quite broad and very active area of spin torque research. Since those initial works, there has been remarkable progress in advancing the fundamental understanding of this new spintronics phenomenon, and in successfully moving it towards technological implementations, particularly spin-torque magnetic random access memory (ST-MRAM) and spin-torque microwave oscillator applications, that have the potential for broad impact. In this presentation I will discuss the basics of the spin torque effect and briefly survey the various approaches that can be employed to demonstrate and study it in both all-metallic, spin-valve-type nanostructures and, most importantly for applications, in nanoscale magnetic tunnel junctions (MTJs). I will discuss some recent work that has sought to contribute to the rapidly advancing spin-torque research effort, by helping both to better understand quantitatively the details of the phenomenon and to understand and enhance the efficiency of the effect I will summarize results from studies of spin-transfer switching and microwave excitation in magnetic tunnel junctions (MTJs), which include the use of the spin transfer phenomenon to quantitatively determine, through spin-torque- excited ferromagnetic resonance (ST-FMR), both the bias dependent efficiency of the spin torque in high quality MTJs and the magnetic damping of individual free layer nanomagnets. I will also briefly describe some recent work that has been examining spin torque effects in nanoscale structures with distinctly non-uniform magnetization which is giving us some new information regarding magnetic dynamics in nanoscale structures and are pointing to ways by which it may be possible to significantly reduce the spin polarized current needed for the short- pulse switching of a thermally stable nanomagnet for MRAM applications. I will conclude by briefly discussing some of challenges that remain to be overcome before spin-torque based technologies, particularly ST-MRAM, can be successfully implemented and of the pathways that might be effectively taken to overcome those challenges.
Starting Page	223
Ending Page	224
File Size	963102
Page Count	2
File Format	PDF
ISBN	9781424419425
ISSN	15483770
DOI	10.1109/DRC.2008.4800813
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Torque Writing Magnetic tunneling Magnetic switching Nanostructures Switches Magnetic resonance Magnetic films Magnetic moments Electrons
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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