| In this paper,nickel-iron composite nanoparticles were prepared by pulsed laser deposition and rapid annealing,and then the rapid annealing experimental conditions were changed to grow nickel-iron alloy nanoparticles with different structures.It was characterized by TEM,XPS,and magnetic properties,and various physical properties of nickel-iron alloy nanoparticles with different morphologies and structures were obtained.The laser frequency of pulsed laser deposition is 10Hz,the energy is 300m J,the ablation time is 4h,the annealing temperature is 600?,the annealing time is 5min,and the annealing atmosphere N2 content is 100%as the experimental conditions,and the single crystal can be grown.NiFe alloy nanoparticles.The experimental conditions of pulsed laser deposition are unchanged,annealing temperature is 600?,annealing time is 5min,annealing atmosphere O2 content is 26%,N2 content is 74%as fast annealing conditions,and core-shell structure NiFe/NiFe2O4 nanoparticles can be grown.At the same time,the magnetic properties of samples with the same pulsed laser deposition experiment conditions and the same size were characterized.The results showed that the saturation magnetization of the core-shell structured NiFe/NiFe2O4 nanoparticles was better than that of the single-crystalline NiFe alloy nanoparticles.Based on this,a preliminary conclusion can be drawn:changing the parameters of the rapid annealing experiment can grow embedded nickel-iron alloy nanoparticles with different structures and regulate their magnetic properties. |
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