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

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