Measurements of magnetocrystalline anisotropy and magnetization of nickel

Abstract

This the~is describes the experimental in\leSlig~tion of magnetocryStalJine anisotropy and magnetization of Nickel single crystal. TIle first anisotropy constants have been determined at diflerent temperatures. The anisotropy eons1allls have been delennined by tOfllue measurements in the (Ino) eJystaJlographic plaue 'as ~ timelion of fields and temperatures. TIle mearurements are perfOffiJeil using a Torque Maguetometer wilh ~lllomatic electronic compensating system. TIle temperature dependence of magnetic anisotropy ofNi is fonnd 10 cOlllply with the earlier wurks 011tllis magnetic system. A rotation of the magnetic vectur is predicted arouud the fcrrom~gnetic Curie temperature 7,.. As the samplc entered in In the paramagnetic phase, some nonperiodic signals ne recOlded, tbe cause ofwhieh may he attributcd to (he lncal spin flnctuations in the unhroken clusters containing fClTomagnetica!ly ordered spins lIear the onset of paramagnetic phase. I1le magnetization of the sample is measured by a Vibrating Sample Magnetomeler (V S,M). The valiation of the anisotropy constants due to ch~nge oftemperatllre is found to he faster than the variation of m~guetization in NickeL