2007/04/27 by A. V. Syromyatnikov · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Ferroelectric and Piezoelectric Materials #Multiferroics and related materials #cond-mat.str-el
paper · pdf · doi:10.1134/s1063776107090154
published as JETP 105, 587 (2007) · 12 pages, 3 figures, accepted in JETP
arxiv created 2007/04/27 · openalex publication_date 2007/10/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We discuss a model nonfrustrated magnetoelectric in which a sufficiently strong magnetoelectric coupling produces an incommensurate magnetic order leading to ferroelectricity. Properties of the magnetoelectric in the magnetic field directed perpendicular to the wave vector describing the spin helix are considered in detail. Analysis of the classical energy shows that in contrast to the naive expectation, the onset of ferroelectricity occurs at a field H c1 that is lower than the saturation field H c2. We have H c1 = H c2 at large enough magnetoelectric coupling. We show that at H = 0, ferroelectricity occurs at T = T FE < T N. A qualitative discussion of the phase diagram in the H-T plane is presented within the mean-field approach.