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Can the magnetoelectric effect coexist with weak piezomagnetism and ferromagnetism?Mikheev Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, S Kovalevskoi str. 18, Ekaterinburg, 620108, Russian Federation A new approach to the study of antiferromagnetic phenomena in terms of the exchange magnetic structure code is examined. If the positions of the magnetic ions are known this code could play the same role in the symmetric description as the international symbol for the crystallographic space group plays in the description of the properties of nonmagnetic crystals.
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