Metastable state in a shape-anisotropic single-domain nanomagnet subjected to spin-transfer-torque

Authors

Kuntal Roy, Virginia Commonwealth UniversityFollow
Supriyo Bandyopadhyay, Virginia Commonwealth UniversityFollow
Jayasimha Atulasimha, Virginia Commonwealth UniversityFollow

Document Type

Article

Original Publication Date

2012

Journal/Book/Conference Title

Applied Physics Letters

Volume

101

Issue

16

DOI of Original Publication

10.1063/1.4761250

Comments

Originally published at http://dx.doi.org/10.1063/1.4761250

Date of Submission

March 2015

Abstract

We predict the existence of a metastable magnetization state in a single-domain nanomagnet with uniaxial shape anisotropy. It emerges when a spin-polarized current, which delivers a spin-transfer-torque possessing a field-like component, is injected into the nanomagnet. At a metastable state, the internal torque due to nanomagnet's shape anisotropy cancels the externally applied spin-transfer-torque and hence the nettorque acting on the magnetization becomes zero. Therefore, it prevents spin-transfer-torque from switching the magnetization from one stable state along the easy axis to the other, even in the presence of room-temperature thermal fluctuations.

Rights

Roy, K., Bandyopadhyay, S., and Atulasimha, J. Metastable state in a shape-anisotropic single-domain nanomagnet subjected to spin-transfer-torque. Applied Physics Letters, 101, 162405 (2012). Copyright © 2012 AIP Publishing LLC.

Is Part Of

VCU Electrical and Computer Engineering Publications