If a piezomagnetic material is mechanically coupled to a piezoelectric material we observe the indirect magnetoelectric effect. A magnetic field $H$ leads to strain $\varepsilon$ and stress $\sigma$ resulting in an electric polarisation $P$:
$H \rightarrow \varepsilon \rightarrow \sigma \rightarrow P$
As far as I know, this effect usually also occurs in the opposite direction:
$P \rightarrow \sigma \rightarrow \varepsilon \rightarrow H$
Is it possible (e.g. by utilizing certain materials) to build a composite in which the effect only occurs in one direction (energy flow in only one direction similar to the current through an electrical diode)?
