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

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3 Author(s)
Roy, Kuntal ; Department of Electrical and Computer Engineering, Virginia Commonwealth University, Richmond, Virginia 23284, USA ; Bandyopadhyay, Supriyo ; Atulasimha, Jayasimha

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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 net torque 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.

Published in:

Applied Physics Letters  (Volume:101 ,  Issue: 16 )