Spatial Variation of the Magnetization Across a Ferromagnetic Thin Film in the Bethe-Peierls-Weiss Approximation

摘要: The variation of the magnetization across a ferromagnetic film, because fact that spin at surface film has an environment different from interior spin, been calculated as function temperature. A previous calculation this effect by Valenta used approximation equivalent to molecular field for bulk case. He extended spatially varying case allowing vary film. Since gives Curie temperature which is 60% too high problem, it cannot be expected give quantitatively correct results present introduces into higher‐order approximation, Bethe‐Peierls‐Weiss approximation. In treats one and its interaction with nearest neighbors exactly. rest spins are then approximated field. i...