Spin Flexoelectricity and New Aspects of Micromagnetism

Abstract

The coupling between the strain gradient and electric polarization is known as flexoelectricity in dielectrics materials. In case of magnetic media it takes the form of electric polarization induced by spin modulation and vice versa. This spin flexoelectricity causes new physical phenomena of micromagnetism such as electric field driven magnetic domain wall motion and electrical control of magnetic vortices in magnets as well as clamping of the magnetic domain walls at the ferroelectric ones in multiferroics.

Micromagnetic structures: flexomagnetoelectric coupling point symmetry and Neumann's principle

“…Let us consider a similar situation in case of a FME coupling. The wellknown expression of the FME coupling [22,27,28] is given by a Lifshitz invariant-like single-constant coupling term:…”

Inhomogeneous Magnetoelectric Effect on Defect in Multiferroic Material: Symmetry Prediction

“…Magnetically induced ferroelectricity is caused by homogeneous [3][4][5][6] or inhomogeneous [7][8][9][10] magnetoelectric interaction. The last appears in spiral multiferroics [11] or micromagnetic structures like domain walls (DWs) [7,[12][13][14][15][16][17] including cases of magnetization distribution heterogeneities (0-degree DWs). Ferroelectricity developed from micromagnetic structure can appear in any magnetic material even in centrosymmetric one [18].…”