Abstract
We have devised a ferromagnetic ``ratchet'' superlattice composed of three sequential compositions (hole-doping levels) of cobalt perovskite layers so as to simultaneously break time-reversal and spatial-inversion symmetries. The broken symmetries are shown by the enhancement of magnetic second-harmonic (SH) light in the low-temperature range of $T\ensuremath{\lesssim}60\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. The peculiar temperature dependence of the magnetic SH intensity, which is in total disagreement with that of the net magnetization, is discussed in the light of possible compensation of the toroidal moments among the three kinds of interface.
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