Skip to main content Accessibility help
×
Home
Hostname: page-component-65dc7cd545-spssh Total loading time: 0.181 Render date: 2021-07-24T01:57:00.086Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": true, "newCiteModal": false, "newCitedByModal": true, "newEcommerce": true, "newUsageEvents": true }

Understanding Structural Changes in Phase Change Memory Alloys

Published online by Cambridge University Press:  01 February 2011

Paul James Fons
Affiliation:
paul-fons@aist.go.jp, National Institute of Advanced Industrial Science & Technology, Center for Applied Near-Field Optics Research, Tsukuba Central 4, Higashi 1-1-1, Tsukuba, Ibaraki, 305-8562, Japan, 81-298-61-5636, 81-298-61-2939
Dale Brewe
Affiliation:
brewe@aps.anl.gov, Advanced Light Source, PNC-XOR, Argonne National Laboratory, Bldg 435E sector 20, 9700 S. Cass Ave., Argonne, Il, 60439, United States
Ed Stern
Affiliation:
stern@phys.washington.edu, University of Washington, Physics Department, Box 351560, University of Washington, Seattle, WA, 98195, United States
A. V. Kolobov
Affiliation:
a.kolobov@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Center for Applied Near-Field Optics Research, Higashi 1-1-1, Tsukuba Central 4, Tsukuba, Ibaraki, 305-8562, Japan
Junji Tominaga
Affiliation:
j-tominaga@aist.go.jp, National Institute of Advanced Industrial Science and Technology, Center for Applied Near-Field Optics Research, Higashi 1-1-1, Tsukuba Central 4, Tsukuba, Ibaraki, 305-8562, Japan
Get access

Abstract

In addition to their wide-spread application in the re-writable optical memory markets, phase-change memory alloys are also poised to take a prominent role in future non-volatile memory applications due to their potential for low-energy usage and indefinite cyclability compared with their silicon-based flash memory counterparts. In contrast with their widespread use, however, the details of the crystalline to amorphous switching process utilized for memory storage remain an active research topic with many details still lacking. Considering the conflicting requirements for high-speed switching, yet long term data storage integrity, a deeper understanding of these materials is essential for insightful application development. We have used x-ray absorption fine structure spectroscopy (XAFS), a technique equally suitable for amorphous and crystalline phases to elaborate details in structural changes in the phase-change process for a variety of phase-change alloys in static measurements. As the kinetics of the switching process are the linchpin for optimizing switching characteristics, we have recently initialted dynamic measurements of light -induced structural changes in Ge-Sb-Te (GST) alloys. These measurements have been carried out synchronously using both femtosecond and nanosecond laser pump pulses in conjunction with 100~ps x-ray pulses generated by an electron storage ring. By synchronously triggering the laser with a variable sub-nanosecond delay, we have been able to use XAFS to probe details of the dynamics of the switching process. Preliminary results learned from this approach applied to GST alloys are presented.

Type
Research Article
Copyright
Copyright © Materials Research Society 2006

Access options

Get access to the full version of this content by using one of the access options below.

References

[1] Ovshinsky, S.R., Phys. Rev. Lett. 21, 14501453 (1968).CrossRefGoogle Scholar
[2] Petrov, I.I., Imamov, R.M., and Pinsker, Z.G., Sov. Phys. Cryst. 13, 339344 (1968)Google Scholar
[3] Matsunaga, Toshiyuki and Yamada, Noboru, Jpn. J. Appl. Phys. Pt. 141, 16741678 (2002).CrossRefGoogle Scholar
[4] Kolobov, A.V., Fons, P., Tominaga, J. Frenkel, A., Ankudinov, A.L., and Uruga, T., Nature Materials 3, 703708 (2004).CrossRefGoogle Scholar
[5] Chattopadhyay, T., Boucherle, JX, and Vonschnering, HG, J. Phys. C. 20, 14311440 (1987).CrossRefGoogle Scholar
[6] Siegel, J., Schropp, A., Solis, J., Afonso, C. N., and Wuttig, M., Appl. Phys. Lett. 84, 22502252 (2004).CrossRefGoogle Scholar
[7] Handbook of X-ray Photoemission Spectroscopy, Physical Electronics Inc. (1995).Google Scholar
[8] Graves, J.S. and Allen, R.E., Phys. Rev. B 58, 13627 (1998)CrossRefGoogle Scholar
[9] Welnic, W., Pamungkas, A., Detemple, R., Steimer, C., Blugel, S., and Wuttig, M., Nat. Mat. 5, 58 (2006).CrossRefGoogle Scholar

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Understanding Structural Changes in Phase Change Memory Alloys
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

Understanding Structural Changes in Phase Change Memory Alloys
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

Understanding Structural Changes in Phase Change Memory Alloys
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *