Ferromagnetic Resonance in Evaporated Thin Film of MnSb

A study is made on the preparation and the magnetic properties of the polycrystal film of MnSb. Magnetic properties and crystal structure of the film are investigated through ferromagnetic resonance and electron diffraction, respectively. The Curie temperature T c for the MnSb film is determined from the anomaly in the temperature dependence of electrical resistance. The films are deposited onto glass substrates. Their thicknesses are estimated to be between 300 and 4000 Å. The MnSb film is able to be obtained by melt-evaporation when the filament temperature T f is higher than 1500°C and by flash-evaporation when T f ≧1250°C. The MnSb film has a =4.13 Å, c =5.79 Å, c / a =1.40 and T c =310°C. The observation of spin wave resonance is possible only in the MnSb film deposited on an unheated substrate. The exchange coupling constant A and the exchange integral J for MnSb are determined to be A =0.30×10 -6 erg/cm and J =7.0×10 -15 erg. A relation between A and J is calculated on the basis of the atomic model for the polycrystal MnSb with a hexagonal NiAs type of structure.