55~Tesla coercive magnetic field in frustrated Sr$_3$NiIrO$_6$

ORAL

Abstract

We have measured extremely large coercive magnetic fields of up to 55~T in Sr$_3$NiIrO$_6$, with a switched magnetic moment $\approx 0.8~\mu_{\rm B}$ per formula unit. As far as we are aware, this is the largest coercive field observed thus far. This extraordinarily hard magnetism has a completely different origin from that found in conventional ferromagnets. Instead, it is due to the evolution of a frustrated antiferromagnetic state in the presence of strong magnetocrystalline anisotropy due to the overlap of spatially-extended Ir$^{4+}$ 5$d$ orbitals with oxygen 2$p$ and Ni$^{2+}$ 3$d$ orbitals. This work highlights the unusual physics that can result from combining the extended $5d$ orbitals in Ir$^{4+}$ with the frustrated behaviour of triangular lattice antiferromagnets.

*Supported by DOE BES program "Science in 100 T"

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Authors

  • John Singleton

    • Los Alamos Natl Lab
    • NHMFL/LANL
    • National High Magnetic Field Lab, Los Alamos Natl Lab

  • Jae-Wook Kim

    • Rutgers University

  • Craig Topping

    • Oxford University

  • Anders Hansen

    • Los Alamos Natl Lab

  • Eun-Deok Mun

    • Simon Fraser University

  • Saman Ghannadzadeh

    • Oxford University

  • Paul Goddard

    • Warwick University

  • Xuan Luo

    • Rutgers University

  • Yoon Seok Oh

    • Rutgers University

  • Sang-Wook Cheong

    • Rutgers University

  • Vivien Zapf

    • Los Alamos Natl Lab