Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session S19: New Opportunities in Spin Sensing, Manipulation and Resonance without Time-Varying Magnetic Fields
11:15 AM–2:15 PM,
Thursday, March 5, 2020
Sponsoring Unit: GMAG
Chair: Michael Flatté, Univ of Iowa
Abstract: S19.00003 : Magnetoresistance Measurements as an Alternative to Magnetic Resonance Methods for Studying Paramagnetic Defects*
View Presentation Abstract
(Univ of Evansville)
(Univ of Evansville)
Recently an alternative approach to probing paramagnetic spins was devised which does not require any electromagnetic resonant field but instead magnetoresistance is measured near zero field . The magnetoresistance arises from correlations between spin pairs that involve either a carrier recombining at a trap or hopping through a trap . This magnetoresistance method can be used in electronic devices to great advantage by probing paramagnetic defect environments such as hyperfine and spin-orbit couplings. A theoretical description of the magnetoresistance effect utilizes a multi-spin stochastic Liouville equation  which provides agreement with recombination currents in MOSFETs. For high-nuclear spin defects, the theory predicts new resonances in the magnetoresistance that provide precise determination of hyperfine constants. These results offer a new means of analysis which does not rely on a resonator and are potentially applicable to systems inaccessible to conventional resonance methods.
This work was done in collaboration with the groups of M. E. Flatté (U of Iowa ) and P. A. Lenahan (Penn. State U).
 J. Ashton et al, IEEE Trans. on Nucl. Sci. 66, 428 (2019)
 J. Rybicki et al, Phys. Rev. Lett. 109, 076603 (2012)
 Y. Wang et al, Phys. Rev. X 6, 011011 (2016)
*The project or effort depicted was or is sponsored by the Department of the Defense, Defense Threat Reduction Agency, HDTRA 1-18-1-0012 and HDTRA 1-16-0008. The content of the information does not necessarily reflect the position or the policy of the federal government, and no official endorsement should be inferred.
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
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