Theoretical investigations of magnetic properties of ferromagnetic single-layered nanobelts

The magnetic properties of ferromagnetic (FM) single‐layered nanobelts are investigated if there exists a single‐ion anisotropy. The magnetic quantities as functions of belt width and temperature are calculated. The spontaneous magnetization, area of the hysteresis loop, and energy level extension increase with belt width, and decrease with temperature. The Curie temperature increases with belt width. The energy spectra are calculated. When the belt width is fixed, a higher temperature leads to lower energy spectra. The spin‐wave energy, as well as the energy level extension, drops with temperature rising, and becomes zero as the temperature reaches the Curie temperature. The results are compared with those of FM single‐walled nanotubes. The Curie point TC of a nanobelt is always smaller than that of a nanotube, when the width of the former and the perimeter of the latter are equal, and the reason is analyzed.