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Minimize RSR Award Detail

Research Spending & Results

Award Detail

Awardee:BOARD OF REGENTS OF THE UNIVERSITY OF NEBRASKA
Doing Business As Name:University of Nebraska-Lincoln
PD/PI:
  • Kirill D Belashchenko
  • (402) 472-2396
  • belashchenko@unl.edu
Award Date:12/23/2019
Estimated Total Award Amount: $ 363,787
Funds Obligated to Date: $ 240,204
  • FY 2020=$240,204
Start Date:02/01/2020
End Date:01/31/2023
Transaction Type:Grant
Agency:NSF
Awarding Agency Code:4900
Funding Agency Code:4900
CFDA Number:47.049
Primary Program Source:040100 NSF RESEARCH & RELATED ACTIVIT
Award Title or Description:First-Principles Studies of Spin-Orbit Torque and Magnetoresistance in Magnetic Nanostructures
Federal Award ID Number:1916275
DUNS ID:555456995
Parent DUNS ID:068662618
Program:CONDENSED MATTER & MAT THEORY
Program Officer:
  • Daryl Hess
  • (703) 292-4942
  • dhess@nsf.gov

Awardee Location

Street:151 Prem S. Paul Research Center
City:Lincoln
State:NE
ZIP:68503-1435
County:Lincoln
Country:US
Awardee Cong. District:01

Primary Place of Performance

Organization Name:University of Nebraska-Lincoln
Street:2200 Vine St, 151 Wittier
City:Lincoln
State:NE
ZIP:68588-0430
County:Lincoln
Country:US
Cong. District:01

Abstract at Time of Award

NONTECHNICAL SUMMARY This award supports computational research and education aimed to advance understanding of the microscopic mechanisms responsible for the operation of nanoscale magnetic devices. The focus is on devices where electric currents cause dynamic reorientation of the magnetic moments. The PI will investigate devices made of two layers. One is a ferromagnet for which smallest microscopic magnets are aligned or an antiferromagnet for which the direction of the smallest microscopic magnets alternates along particular directions in the layer. The other layer is a normal metal that contains heavy atoms. The ultimate source of current-induced dynamics is spin-orbit coupling – an effect that arises in Einstein's theory of special relativity in which electrons which themselves act like tiny spinning tops interact with their own motion. The spin-orbit effect is strongest in materials comprised of heavy elements. These bilayer nanostructures are promising for applications in nanoelectronic devices, such as new types of magnetic memories, tunable high-frequency nano-oscillators, logic gates, and other building blocks for digital information processing and storage technologies. Improved understanding of the underlying mechanisms by which nanoscale magnetic devices can operate may enable the design of new nanoscale devices and help enhance the functionality and efficiency of existing prototypes. This research will be carried out using state-of-the-art computational tools. Graduate students will contribute to all aspects of the research and its dissemination; in so doing, they will receive extensive training in advanced condensed matter and materials theory, and modeling techniques. This project includes additional education activities involving the redesign of core graduate-level courses in physics based on modern active-learning and peer-instruction approaches. TECHNICAL SUMMARY This award supports computational research and education on nonequilibrium spin torques produced by spin-orbit coupling in the presence of an in-plane electric current in heterostructures consisting of a ferromagnetic or antiferromagnetic layer and a normal-metal layer. This study will utilize first-principles calculations and a nonequilibrium Green’s function technique with direct supercell averaging over disorder configurations. The overall goal is to develop better understanding of coupled charge and spin transport in magnetic nanostructures and mechanisms contributing to spin-orbit torques and related magnetoresistive effects. This goal will be achieved by investigating the dependence of the damping-like, field-like, and higher-order angular components of spin-orbit torque on various materials and device parameters, including layer thicknesses, disorder type and strength, crystallographic orientation of the interface, surface oxidation, and the presence of capping or spacer layers. Comparison of the results with experimental data will help identify the underlying mechanisms and phenomenological theories that capture the key features and trends in the observations. Spin relaxation at metallic interfaces in heterostructures with current flowing perpendicular to the interfaces will also be studied using direct averaging over disorder configurations in multilayers. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

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