Evidence of resistive switching into a dynamical state in antiferromagnetic iridates

ORAL

Abstract

Resistive switching, which is targeted for antiferromagnetic (AFM) memory applications [1], has recently been observed in the AFM iridates Sr2IrO4 [2] and Sr3Ir2O7 [3, 4]. Here we demonstrate that the switching state at high electrical biases displays an increased noise pattern, which is indicative of a dynamical state at high biases. We employ a spectrum analyzer to characterize the noise pattern associated with the high-bias switching state and investigate the dependence of the noise spectrum on the magnitude of applied bias and magnetic field. The emergence of the noise was found to be strongly correlated with the onset of resistive switching. The noise power density displayed a 1/f2 frequency dependence with an amplitude mimicking the hysteretic behavior of the resistance switching. We argue that the observed noise spectrum could be associated with a random switching between different states and discuss various interpretations of its origin.

[1] V. Baltz et al. Rev. Mod. Phys. 90, 015005 (2018); [2] C. Wang et al. Phys. Rev. B 92, 115136 (2015); [3] H. Seinige et al. Phys. Rev. 94, 214434 (2016); [4] M. Williamson et al. Phys. Rev. B 97, 134431 (2018).

*This work was supported in part by NSF grants DMR-1712101 and DMR-1122603, and by KAUST Award No. OSR-2015-CRG4-2626.

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Presenters

  • Morgan Williamson

    • Department of Physics and Texas Materials Institute, University of Texas at Austin
    • Physics Department and Texas Materials Institute, University of Texas at Austin

Authors

  • Morgan Williamson

    • Department of Physics and Texas Materials Institute, University of Texas at Austin
    • Physics Department and Texas Materials Institute, University of Texas at Austin

  • Shida Shen

    • Department of Physics and Texas Materials Institute, University of Texas at Austin
    • Physics Department and Texas Materials Institute, University of Texas at Austin

  • Gang Cao

    • Department of Physics, University of Colorado-Boulder
    • Department of Physics, University of Colorado, Boulder CO 80309
    • Department of Physics, University of Colorado, Boulder, CO 80309
    • Department of Physics, University of Colorado at Boulder
    • Physics and Astronomy, University of Kentucky
    • University of Colorado, Boulder
    • University of Colorado Boulder

  • Jianshi Zhou

    • Texas Materials Institute, University of Texas at Austin
    • University of Texas at Austin
    • Mechanical Engineering, University of Texas at Austin
    • Mechanical Engineering, University of Texas
    • University of Texas (Austin, USA)
    • Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA

  • Maxim Tsoi

    • Department of Physics and Texas Materials Institute, University of Texas at Austin
    • Physics Department and Texas Materials Institute, University of Texas at Austin