Image of Dynamic Local Exchange Interactions in the dc Magnetoresistance of Spin-Polarized Current through a Dopant

Stephen R. McMillan; Nicholas J. Harmon; Michael E. Flatte

doi:10.1103/PhysRevLett.125.257203

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Image of Dynamic Local Exchange Interactions in the dc Magnetoresistance of Spin-Polarized Current through a Dopant

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Image of Dynamic Local Exchange Interactions in the dc Magnetoresistance of Spin-Polarized Current through a Dopant

Stephen R. McMillan, Nicholas J. Harmon and Michael E. Flatte

Physical review letters, Vol.125(25), pp.257203-257203

12/17/2020

DOI: 10.1103/PhysRevLett.125.257203

PMID: 33416385

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Abstract

We predict strong, dynamical effects in the dc magnetoresistance of current flowing from a spin-polarized electrical contact through a magnetic dopant in a nonmagnetic host. Using the stochastic Lionville formalism we calculate clearly defined resonances in the de magnetoresistance when the applied magnetic field matches the exchange interaction with a nearby spin. At these resonances spin precession in the applied magnetic field is canceled by spin evolution in the exchange field, preserving a dynamic bottleneck for spin transport through the dopant. Similar features emerge when the dopant spin is coupled to nearby nuclei through the hyperfine interaction. These features provide a precise means of measuring exchange or hyperfine couplings between localized spins near a surface using spin-polarized scanning tunneling microscopy, without any ac electric or magnetic fields, even when the exchange or hyperfine energy is orders of magnitude smaller than the thermal energy.

Physical Sciences

Physics

Physics, Multidisciplinary

Science & Technology

Details

Title: Subtitle: Image of Dynamic Local Exchange Interactions in the dc Magnetoresistance of Spin-Polarized Current through a Dopant
Creators: Stephen R. McMillan - University of Iowa
Nicholas J. Harmon - University of Iowa
Michael E. Flatte - Eindhoven University of Technology
Resource Type: Journal article
Publication Details: Physical review letters, Vol.125(25), pp.257203-257203
DOI: 10.1103/PhysRevLett.125.257203
PMID: 33416385
NLM abbreviation: Phys Rev Lett
ISSN: 0031-9007
eISSN: 1079-7114
Publisher: Amer Physical Soc
Number of pages: 6
Grant note: DE-SC0016447; DE-SC0016379 / U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences; United States Department of Energy (DOE)
Language: English
Date published: 12/17/2020
Academic Unit: Electrical and Computer Engineering; Physics and Astronomy
Record Identifier: 9984428774102771

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