Surface inversion breaking in collinear magnets is predicted to produce a bound ferroelectric polarization through grad(m^2) magnetoelectric coupling and through DMI-driven spin canting.
Khomskii, Physics 2 , 20 (2009)
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Theory of surface-induced multiferroicity in magnetic materials, thin films and multilayers
Surface inversion breaking in collinear magnets is predicted to produce a bound ferroelectric polarization through grad(m^2) magnetoelectric coupling and through DMI-driven spin canting.