Synthesis, characterization and investigation of some physical textures of magnetite-silica-L-Proline nanoparticles modified with some transition metals (Co, Mn, Cu, Ni)

•Fe3O4 was synthesized through chemical precipitation method.•Fe3O4@SiO2 was synthesized through sol–gel (Stöber process) method.•Fe3O4@SiO2@L-Pro-X (X = Co, Mn, Cu, Ni) magnetic nanomaterials were obtained for the first time by immobilization of transition metals on Fe3O4@SiO2@L-Pro.•Fe3O4, Fe3O4@SiO2, Fe3O4@SiO2@L-Pro and Fe3O4@SiO2@L-Pro-X magnetic nanomaterials were successfully synthesized.•Structures and surfaces of magnetic nanomaterials were characterized.