Ising nanowires with simple core–shell structure; Their characteristic phenomena

•Ferrimagnetic behavior in the system with a negative exchange interaction.•A characteristic behavior of saturation magnetizations.•Common phase diagrams for nanowires.

The phase diagrams and magnetizations of Ising nanowires with simple core–shell structure are investigated by the use of the effective field theory with correlations. A lot of characteristic behaviors observed in ferromagnetic and ferrimagnetic materials as well as novel phenomena have been obtained, although one section of the system is consisted of one spin-1/2 surface shell atom and one spin-1/2 core atom and they are coupled with a positive or a negative shell–core exchange interaction.