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We report a current scaling study of a quantum phase transition between aquantum anomalous Hall insulator and a trivial insulator on the surface of aheterostructure film of magnetic topological insulators. The transition wasobserved by tilting the magnetization while measuring the Hall conductivity$\sigma_{xy}$. The transition curves of $\sigma_{xy}$ taken under variousexcitation currents cross each other at a single point, exemplifying a quantumcritical behavior of the transition. The slopes of the transition curves followa power law dependence of the excitation current, giving a scaling exponent.Combining with the result of the previous temperature scaling study, criticalexponents $\nu$ for the localization length and $p$ for the coherence lengthare separately evaluated as $\nu$ = 2.8 $\pm$ 0.3 and $p$ = 3.3 $\pm$ 0.3.

Current scaling of the topological quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator