  We have investigated the field-induced-changes in both the magnetization and
the polarization in ferromagnet/Insulator/ferroelectric (FM/I/FE) multilayer by
following both the Stoner-Wohlfarth (SW) model and the Landau theory. It has
been found that with the stresses introduced in the FM/I/FE structure by the
fields, both the magnetization and the polarization states can be significantly
modified and the combination of their states can be of multiple states. These
results demonstrate the feasibility of combining both the spintronics and the
ferroelectrics into the multiferroictronics.
