  In spite of both technical and fundamental importance, reversal of a
macroscopic magnetization by an electric field (E) has been limitedly realized
and remains as one of great challenges. Here, we report the realization of
modulation and reversal of large magnetization (M) by E in a multiferroic
crystal Ba0.5Sr1.5Zn2(Fe0.92Al0.08)12O22, in which a transverse conical spin
state exhibits a remanent M and electric polarization below ~150 K. Upon
sweeping E between +- 2 MV/m, M is quasi-linearly varied between +- 2
{\mu}B/f.u., resulting in the M reversal. Moreover, the remanent M shows
non-volatile changes of {\Delta}M = +- 0.15 {\mu}B/f.u., depending on the
history of the applied electric fields. The large modulation and the
non-volatile two-states of M at zero magnetic field are observable up to ~150 K
where the transverse conical spin state is stabilized. Nuclear magnetic
resonance measurements provide microscopic evidences that the electric field
and the magnetic field play an equivalent role, rendering the volume of
magnetic domains change accompanied by the domain wall motion. The present
findings point to a new pathway for realizing the large magnetization reversal
by electric fields at fairly high temperatures.
