The effect of hydrogen treatment on magnetic property of porous iron oxides nanorods

• Porous iron oxide nanorods were obtained by hydrogenation of hematite nanorods at several annealing temperature.
• Reduced iron oxide layer in iron oxide nanocomposite consisted with two crystal phase formations.
• Hydrogenated iron oxides on the magnetism show exchange bias originates from the strong magnetic interface coupling.

We demonstrated that magnetic properties of porous iron oxide nanorods obtained by hydrogenation of hematite nanorods at several annealing temperature (523, 573, 623, and 673 K). The iron oxide and reduced iron oxide layer in iron oxide nanocomposite nanorods show porous iron oxide nanorods consisted with two phase formation and crystal structure affect on the magnetism via exchange bias originated from the strong magnetic interface coupling of a ferromagnetic with an antiferromagnetic or ferrimagnetic species.