Voltage-driven spin-transfer torque in a magnetic particle

Gartland, P.; Davidović, D.

doi:10.1063/1.4934837

Title: Voltage-driven spin-transfer torque in a magnetic particle

Journal Article · Mon Oct 26 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4934837· OSTI ID:1469595

Gartland, P. ^[1]; Davidović, D. ^[1]

Georgia Inst. of Technology, Atlanta, GA (United States). School of Physics

In this paper, we discuss a spin-transfer torque device, where the role of the soft ferromagnetic layer is played by a magnetic particle or a magnetic molecule, in weak tunnel contact with two spin polarized leads. We investigate if the magnetization of the particle can be manipulated electronically, in the regime where the critical current for magnetization switching is negligibly weak, which could be due to the reduced particle dimensions. Using master equation simulations to evaluate the effects of spin-orbit anisotropy energy fluctuations on spin-transfer, we obtain reliable reading and writing of the magnetization state of such magnetic particle, and find that the device relies on a critical voltage rather than a critical current. The critical voltage is governed by the spin-orbit energy shifts of discrete levels in the particle. Finally, this finding opens a possibility to significantly reduce the power dissipation involved in spin-transfer torque switching, by using very small magnetic particles or molecules.

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Research Organization:: Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-06ER46281

OSTI ID:: 1469595

Alternate ID(s):: OSTI ID: 1224333

Journal Information:: Applied Physics Letters, Vol. 107, Issue 17; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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Long spin lifetime and large barrier polarisation in single electron transport through a CoFe nanoparticle Temple, R. C.; McLaren, M.; Brydson, R. M. D. Scientific Reports, Vol. 6, Issue 1 https://doi.org/10.1038/srep28296	journal	June 2016

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