On ferrotoroidics and electrotoroidic, magnetotoroidic and piezotoroidic effects*

Abstract

Some historical aspects of the discovery of the “axio-polar” (time-odd polar) vector, its appearance as an anapole moment in atomic nuclei and in the form of a spontaneous toroidal moment in “ferrotoroidic” crystals and domains are discussed. The related linear and bilinear “electrotoroidic” and “magnetotoroidic” effects, as well as the “piezotoroidic” and linear “toroido-optic effect” are postulated.

Keywords:

• toroidal moment
• ferrotoroidic domains
• magnetoelectric
• electrotoroidic
• magnetotoroidic
• piezotoroidic