The Electric-Field Controllable Non-Volatile 35^\circ Rotation of Magnetic Easy Axis in Magnetoelectric CoFeB/(001)-Cut Pb(Mg_1/3Nb_2/3)O_3-25%PbTiO_3 Heterostructure

Using in situ electric-field-modulated anisotropic magnetoresistance measurement, a large reversible and non-volatile in-plane rotation of magnetic easy axis of \sim35^\circ between the positive and negative electrical poling states is demonstrated in Co_40Fe_40B_20/(001)-cut Pb(Mg_1/3Nb_2/3)O_3-0.25PbTiO_3 (PMN-PT). The specific magnetoelectric coupling mechanism therein is experimentally verified to be related to the synchronous in-plane strain rotation induced by 109^\circ ferroelastic domain switching in the (001)-cut PMN-PT substrate.