Magnetic bit stability: Competition between domain-wall and monodomain switching

Silas Hoffman; Yaroslav Tserkovnyak; Pedram Khalili Amiri; Kang L. Wang

doi:10.1063/1.4716023

Magnetic bit stability: Competition between domain-wall and monodomain switching

Silas Hoffman^*, Yaroslav Tserkovnyak, Pedram Khalili Amiri, Kang L. Wang

^*Corresponding author for this work

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

We numerically study the thermal stability properties of computer memory storage realized by a magnetic ellipse. In the case of practical magnetic random-access memory devices, the bit can form a spin texture during switching events. To study the energy barrier for thermally induced switching, we develop a variational procedure to force the bit to traverse a smooth path through configuration space between the points of stability. We identify textured configurations realizing domain-wall propagation, which may have an energy barrier less than that of the corresponding monodomain model. We contrast the emergence of such micromagnetic effects in thermal versus field-induced switching.

Original language	English (US)
Article number	212406
Journal	Applied Physics Letters
Volume	100
Issue number	21
DOIs	https://doi.org/10.1063/1.4716023
State	Published - May 21 2012

Funding

The authors would like to thank Juan G. Alzate, Scott Bender, Ilya Krivorotov, and Pramey Upadhyaya for their stimulating input. This work was supported in part by the DARPA and the NSF under Grant No. DMR-0840965 (Y.T.).

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "We numerically study the thermal stability properties of computer memory storage realized by a magnetic ellipse. In the case of practical magnetic random-access memory devices, the bit can form a spin texture during switching events. To study the energy barrier for thermally induced switching, we develop a variational procedure to force the bit to traverse a smooth path through configuration space between the points of stability. We identify textured configurations realizing domain-wall propagation, which may have an energy barrier less than that of the corresponding monodomain model. We contrast the emergence of such micromagnetic effects in thermal versus field-induced switching.",

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AU - Khalili Amiri, Pedram

AU - Wang, Kang L.

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AB - We numerically study the thermal stability properties of computer memory storage realized by a magnetic ellipse. In the case of practical magnetic random-access memory devices, the bit can form a spin texture during switching events. To study the energy barrier for thermally induced switching, we develop a variational procedure to force the bit to traverse a smooth path through configuration space between the points of stability. We identify textured configurations realizing domain-wall propagation, which may have an energy barrier less than that of the corresponding monodomain model. We contrast the emergence of such micromagnetic effects in thermal versus field-induced switching.

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Magnetic bit stability: Competition between domain-wall and monodomain switching

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