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Title: 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:
 [1];  [1]
  1. Georgia Inst. of Technology, Atlanta, GA (United States). School of Physics
Publication Date:
Research Org.:
Georgia Inst. of Technology, Atlanta, GA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
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. doi:10.1063/1.4934837.
Gartland, P., and Davidović, D. Mon . "Voltage-driven spin-transfer torque in a magnetic particle". United States. doi: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 = {2015},
month = {10}
}

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