Magnetic behavior of Joule-heated magnetic core–shell nanowires with positive magnetostrictive core material

•A temperature field is induced in a core-shell wire passed by an dc electric current.•The stresses due to the temperature gradients increase with current intensity.•The supplementary magneto-elastic anisotropy changes the magnetic behavior of system.•An increase of the coercive field with the passing current intensity was observed. Temperature field is an important parameter to be known and controlled in the magnetization process of the core–shell nanowires. The paper analyzes the temperature dependence of hysteretic process in a core–shell nanowire subjected to a dc Joule heating process. An electrical current that passes through the wire induces a temperature and a thermal stress field in the system. Spatial and temporal evolution of the temperature in system was analyzed using a model based on time-dependent heat conduction equation. The stresses determined by thermal gradients and different expansion characteristics of core and shell materials were computed. The temperature and stress depend on the size parameters of the system, dc Joule current and the initial temperature of the system. The magnetic behavior of the nanowire was analyzed using the Micromag application. The magnetic state of the core is influenced by the temperature field induced by a dc current applied to the system. For core materials with positive magnetostriction coefficient the coercive field increases at the increase of dc current intensity passed through the system.