Evidence for a New Magnetoelectric Effect of Current-Induced Magnetization in a Toroidal Magnetic Ordered State of UNi${}_4$B

Abstract

Magnetization measurements under direct electric currents were performed for toroidal magnetic ordered state of UNi${}_4$B to test a recent theoretical prediction of current-induced magnetization in a metallic system lacking local inversion symmetry.We found that each of the electric currents parallel to [$2\bar{1}\bar{1}0$] and [$0001$] in the hexagonal 4-index notation induces uniform magnetization in the direction of [$01\bar{1}0$].The observed behavior of the induced magnetization is essentially consistent with the theoretical prediction; however it also shows an inconsistency suggesting that the antiferromagnetic state of UNi${}_4$B could not simply be regarded as a uniform toroidal order in the ideal honeycomb layered structure.

5 pages, 5 figures, and 1 table

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• Cluster multipole theory for anomalous Hall effect in antiferromagnets
• Toroidal order in metals without local inversion symmetry
• Magnetic hexadecapole order and magnetopiezoelectric metal in Ba${}_{1-x}$K${}_x$Mn${}_2$As${}_2$

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