  The magnetoelectric coupling effect with profound physics and enormous
potential applications has provoked a great number of research activities in
materials science. Here, we report that the reversible orbital reconstruction
driven by ferroelectric polarization modulates the magnetic performance of
ferroelectric ferromagnetic heterostructure. Mn in plane orbital occupancy and
related interfacial exotic magnetic state are enhanced and weakened by the
negative and positive electric field, respectively. Our findings thus not only
present a broad opportunity to fill the missing member, orbital in the
mechanism of magnetoelectric coupling, but also make the orbital degree of
freedom straight forward to the application in microelectronic device.
