Electrically tunable transport and high-frequency dynamics in antiferromagnetic Sr3Ir2O7

Heidi Seinige, Morgan Williamson, Shida Shen, Cheng Wang, Gang Cao, Jianshi Zhou, John B. Goodenough, and Maxim Tsoi
Phys. Rev. B 94, 214434 – Published 29 December 2016
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Abstract

We report dc and high-frequency transport properties of antiferromagnetic Sr3Ir2O7. Temperature-dependent resistivity measurements show that the activation energy of this material can be tuned by an applied dc electrical bias. The latter allows for continuous variations in the sample resistivity of as much as 50% followed by a reversible resistive switching at higher biases. Such a switching is of high interest for antiferromagnetic applications in high-speed memory devices. Interestingly, we found the switching behavior to be strongly affected by a high-frequency (microwave) current applied to the sample. The microwaves at 3–7 GHz suppress the dc switching and produce resonancelike features that we tentatively associated with the dissipationless magnonics recently predicted to occur in antiferromagnetic insulators subject to ac electric fields. We have characterized the effects of microwave irradiation on electronic transport in Sr3Ir2O7 as a function of microwave frequency and power, strength and direction of external magnetic field, strength and polarity of applied dc bias, and temperature. Our observations support the potential of antiferromagnetic materials for high-speed/high-frequency spintronic applications.

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  • Received 30 August 2016
  • Revised 31 October 2016

DOI:https://doi.org/10.1103/PhysRevB.94.214434

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Heidi Seinige1,2, Morgan Williamson1,2, Shida Shen1,2, Cheng Wang1,2, Gang Cao3,4, Jianshi Zhou2, John B. Goodenough2, and Maxim Tsoi1,2

  • 1Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA
  • 2Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA
  • 3Department of Physics, University of Colorado-Boulder, Boulder, Colorado 80309, USA
  • 4Center for Advanced Materials, University of Kentucky, Lexington, Kentucky 40506, USA

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Issue

Vol. 94, Iss. 21 — 1 December 2016

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