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首页> 外文期刊>Nanotechnology >Effects of annealing on the magnetic properties, size and strain of gold-coated Permalloy nanoparticles
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Effects of annealing on the magnetic properties, size and strain of gold-coated Permalloy nanoparticles

机译：退火对镀金坡莫合金纳米粒子的磁性，尺寸和应变的影响

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Fe_(20)Ni_(80)Au core-shell nanoparticles have been prepared by a multi-step microemulsion technique and the influence of annealing from 200 to 500 deg C on the particles' size, morphology and magnetic properties is reported. After annealing under dilute H_2 at 300 deg C and above, FeNi_3-structured Permalloy nanoparticles were observed in the XRD patterns with a lattice parameter of a = 3.560(2) A. The sizes of the nanocomposites increased non-linearly with increasing annealing temperature, accompanied by a decrease in the expansive strain in the shells and cores. The samples were found to exhibit superparamagnetic behaviour with a ferromagnetic component that became dominant at high annealing temperatures due to an increase in the average particle diameter over the critical radius required for superparamagnetic behaviour. The saturation magnetization (Ms) of the samples taken at 300 K increased from 19 emu g~(-1) for the as-prepared sample to 100 emu g~(-1) for the sample annealed at 500 deg C.
机译：通过多步微乳液技术制备了Fe_（20）Ni_（80）Au核壳纳米粒子，并报道了200℃至500℃退火对粒径，形貌和磁性能的影响。在300℃以上的稀H_2下进行退火后，在XRD图案中观察到FeNi_3结构的坡莫合金纳米颗粒的晶格参数为a = 3.560（2）A。纳米复合材料的尺寸随着退火温度的升高呈非线性增加，伴随着壳和核的膨胀应变的减小。发现样品显示出铁磁性成分的超顺磁性行为，由于平均粒径超过超顺磁性行为所需的临界半径，在高退火温度下铁磁性成分占主导。在300 K下采集的样品的饱和磁化强度（Ms）从准备好的样品的19 emu g〜（-1）增加到在500℃退火的样品的100 emu g〜（-1）。

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