Sm Co 5 ∕ Fe nanocomposites synthesized from reductive annealing of oxide nanoparticles

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Hard magnetic nanocomposites SmCo5∕Fex (x=0–2.9) are synthesized by a simultaneous calcium reduction of Sm–Co–O and Fe3O4 nanoparticles. The composites consist of nanostructured SmCo5 and Fe with their average grain sizes at 29 and 8nm, respectively. The magnetic properties of the composites can be tuned by controlling Fe composition. SmCo5∕Fe1.5 shows an enhanced remanent magnetization at 56emu∕g (45emu∕g for SmCo5). The largest coercivity value of 11.6kOe is achieved with SmCo5∕Fe0.23. The synthesis represents a general process toward SmCo-based exchange-spring nanocomposites for high performance permanent magnet applications.