Gigantic tunneling magnetoresistance in magnetic Weyl semimetal tunnel junctions

D. J.P. De Sousa; C. O. Ascencio; P. M. Haney; J. P. Wang; Tony Low

doi:10.1103/physrevb.104.l041401

Gigantic tunneling magnetoresistance in magnetic Weyl semimetal tunnel junctions

D. J.P. De Sousa, C. O. Ascencio, P. M. Haney, J. P. Wang, Tony Low

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

We investigate the tunneling magnetoresistance in magnetic tunnel junctions (MTJs) comprised of Weyl semimetal contacts. We show that chirality-magnetization locking leads to a gigantic tunneling magnetoresistance ratio, an effect that does not rely on spin filtering by the tunnel barrier. Our results indicate that the conductance in the antiparallel configuration is more sensitive to magnetization fluctations than in MTJs with normal ferromagnets, and predicts a TMR as large as 104 % when realistic magnetization fluctuations are accounted for. In addition, we show that the Fermi arc states give rise to a non-monotonic dependence of conductance on the misalignment angle between the magnetizations of the two contacts.

Original language	English (US)
Article number	L041401
Journal	Physical Review B
Volume	104
Issue number	4
DOIs	https://doi.org/10.1103/physrevb.104.l041401
State	Published - Jul 1 2021

Bibliographical note

Funding Information:
D.S., T.L., and J.P.W. were partially supported by the DARPA ERI FRANC program under HR001117S0056-FP-042. D.S., C.O.A., T.L., and J.P.W. were partially supported by the SMART, one of seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by National Institute of Standards and Technology (NIST).

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© 2021 American Physical Society.

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title = "Gigantic tunneling magnetoresistance in magnetic Weyl semimetal tunnel junctions",

abstract = "We investigate the tunneling magnetoresistance in magnetic tunnel junctions (MTJs) comprised of Weyl semimetal contacts. We show that chirality-magnetization locking leads to a gigantic tunneling magnetoresistance ratio, an effect that does not rely on spin filtering by the tunnel barrier. Our results indicate that the conductance in the antiparallel configuration is more sensitive to magnetization fluctations than in MTJs with normal ferromagnets, and predicts a TMR as large as 104 % when realistic magnetization fluctuations are accounted for. In addition, we show that the Fermi arc states give rise to a non-monotonic dependence of conductance on the misalignment angle between the magnetizations of the two contacts.",

author = "{De Sousa}, {D. J.P.} and Ascencio, {C. O.} and Haney, {P. M.} and Wang, {J. P.} and Tony Low",

note = "Funding Information: D.S., T.L., and J.P.W. were partially supported by the DARPA ERI FRANC program under HR001117S0056-FP-042. D.S., C.O.A., T.L., and J.P.W. were partially supported by the SMART, one of seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by National Institute of Standards and Technology (NIST). Publisher Copyright: {\textcopyright} 2021 American Physical Society.",

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AU - De Sousa, D. J.P.

AU - Ascencio, C. O.

AU - Haney, P. M.

AU - Wang, J. P.

AU - Low, Tony

N1 - Funding Information: D.S., T.L., and J.P.W. were partially supported by the DARPA ERI FRANC program under HR001117S0056-FP-042. D.S., C.O.A., T.L., and J.P.W. were partially supported by the SMART, one of seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by National Institute of Standards and Technology (NIST). Publisher Copyright: © 2021 American Physical Society.

PY - 2021/7/1

Y1 - 2021/7/1

N2 - We investigate the tunneling magnetoresistance in magnetic tunnel junctions (MTJs) comprised of Weyl semimetal contacts. We show that chirality-magnetization locking leads to a gigantic tunneling magnetoresistance ratio, an effect that does not rely on spin filtering by the tunnel barrier. Our results indicate that the conductance in the antiparallel configuration is more sensitive to magnetization fluctations than in MTJs with normal ferromagnets, and predicts a TMR as large as 104 % when realistic magnetization fluctuations are accounted for. In addition, we show that the Fermi arc states give rise to a non-monotonic dependence of conductance on the misalignment angle between the magnetizations of the two contacts.

AB - We investigate the tunneling magnetoresistance in magnetic tunnel junctions (MTJs) comprised of Weyl semimetal contacts. We show that chirality-magnetization locking leads to a gigantic tunneling magnetoresistance ratio, an effect that does not rely on spin filtering by the tunnel barrier. Our results indicate that the conductance in the antiparallel configuration is more sensitive to magnetization fluctations than in MTJs with normal ferromagnets, and predicts a TMR as large as 104 % when realistic magnetization fluctuations are accounted for. In addition, we show that the Fermi arc states give rise to a non-monotonic dependence of conductance on the misalignment angle between the magnetizations of the two contacts.

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Gigantic tunneling magnetoresistance in magnetic Weyl semimetal tunnel junctions

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