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Control of Magnetic Behavior In Fe{sub}3O{sub}4 Nanostructures

机译:Fe {sub} 3O {sub} 4纳米结构中磁行为的控制

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Hexagonally well-ordered nanoporous anodized aluminum oxide (AAO) templates were synthesized by electrochemical method. Then, magnetite (Fe{sub}3O{sub}4) nanoparticles of 8-15-nm diameter were filled in the pores of the AAO template, and then the morphology and mag-netic properties were characterized. Vibrating sample magnetometer measurement indicated that the nanoparticles inside AAO showed superparamagnetic behavior at as-filled state. But after annealing at 600 ℃ for 2 hr, the nanostructure (i.e., an assembly of nanoparticles) exhibited coercMty of 80 Oe. Superconducting quantum interference measurement device data showed that after annealing the blocking temperature was above 300 K. Thus, the annealed magnetite nanostructures possessed ferrimagnetism.
机译:通过电化学方法合成了六角形有序的纳米多孔阳极氧化铝(AAO)模板。然后,将直径为8-15 nm的磁铁矿(Fe {sub} 3O {sub} 4)纳米粒子填充到AAO模板的孔中,然后表征其形貌和磁性。振动样品磁力计的测量表明,AAO内部的纳米颗粒在填充状态下表现出超顺磁行为。但在600℃退火2小时后,纳米结构(即纳米颗粒的集合体)显示出80 Oe的矫顽力。超导量子干涉测量装置的数据表明,退火后的阻塞温度在300 K以上。因此,退火的磁铁矿纳米结构具有亚铁磁性。

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