Voltage-driven spin-transfer torque in a magnetic particle
Abstract
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.
- Authors:
-
- Georgia Inst. of Technology, Atlanta, GA (United States). School of Physics
- Publication Date:
- Research Org.:
- Georgia Institute of Technology, Atlanta, GA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1469595
- Alternate Identifier(s):
- OSTI ID: 1224333
- Grant/Contract Number:
- FG02-06ER46281
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Physics Letters
- Additional Journal Information:
- Journal Volume: 107; Journal Issue: 17; Journal ID: ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; superconductivity; spin-transfer-torque; electron tunneling; electronic transport; magnetic anisotropy; spintronics; nanomagnets; electrochemical potential; ferromagnetic materials; magnetic materials
Citation Formats
Gartland, P., and Davidović, D. Voltage-driven spin-transfer torque in a magnetic particle. United States: N. p., 2015.
Web. doi:10.1063/1.4934837.
Gartland, P., & Davidović, D. Voltage-driven spin-transfer torque in a magnetic particle. United States. https://doi.org/10.1063/1.4934837
Gartland, P., and Davidović, D. Mon .
"Voltage-driven spin-transfer torque in a magnetic particle". United States. https://doi.org/10.1063/1.4934837. https://www.osti.gov/servlets/purl/1469595.
@article{osti_1469595,
title = {Voltage-driven spin-transfer torque in a magnetic particle},
author = {Gartland, P. and Davidović, D.},
abstractNote = {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.},
doi = {10.1063/1.4934837},
journal = {Applied Physics Letters},
number = 17,
volume = 107,
place = {United States},
year = {Mon Oct 26 00:00:00 EDT 2015},
month = {Mon Oct 26 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
Long spin lifetime and large barrier polarisation in single electron transport through a CoFe nanoparticle
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