Room temperature ferromagnetic property of Fe-Y (Fe: Y-6.5) composite oxide nano-cluster via an extremely easy and scalable method

Abstract A novel Fe-Y composite oxide (Fe: Y-6.5) nano-cluster were synthesized by self-assembly approach. The α-Fe2O3 and cubic-Y2O3 nanocrystalline with diameter around 10 nm are homogeneously assembled to form a cluster architecture which constitute of Fe6.5Y composite oxide particles. Additional oxygen vacancies were introduced with cubic-Y2O3, and the oxygen vacancies as Fe3+–Vo–Y3+ between α-Fe2O3 and cubic-Y2O3 nanocrystalline generated by self-assembly process. Magnetic hysteresis loops recorded by vibrating sample magnetometry at 273 K display a ferromagnetic order, related to Fe3+–Vo–Y3+ act as defect centers in the bound magnetic polaron model for Fe-Y composite oxide nanomaterial. The ferromagnetic properties are proportional to oxygen vacancy contents, and maximum magnetization (Mm) value of the nano-cluster reaches 5.14 A·m2/g.