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Synthesis and magnetic characterization of MnAs nanoparticles via nanoparticle conversion

机译:纳米粒子转化法合成MnAs纳米粒子及其磁性表征

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We report on the synthesis of ferromagnetic manganese arsenide (MnAs) nanoparticles via the conversion of primary Mn particles which are generated in an aerosol process in a spark discharge generator. After sintering and size selection in an aerosol setup, the particles are deposited on GaAs(100)B and Si(111) substrates. Subsequent conversion to MnAs particles takes place in an annealing process under a hydrogen atmosphere with an arsine background pressure. The magnetic properties are studied using a SQUID magnetometer. The annealed MnAs particles exhibit hexagonal facets and show anisotropic magnetic behaviour on GaAs(100)B substrates, whereas on Si(111) they remain spherical and show isotropic magnetic behaviour. Scanning transmission electron microscopy studies are used to confirm the conversion from Mn to MnAs.
机译:我们报告了通过在火花放电发生器的气溶胶过程中产生的初级Mn颗粒的转化来合成铁磁性砷化锰(MnAs)纳米颗粒。在以气溶胶装置进行烧结和选择尺寸后,将颗粒沉积在GaAs(100)B和Si(111)基板上。随后转化为MnAs颗粒是在退火过程中,在具有砷化本底压力的氢气氛下进行的。使用SQUID磁力计研究磁性能。退火后的MnAs颗粒呈六角形,在GaAs(100)B衬底上表现出各向异性的磁行为,而在Si(111)上,它们保持球形并表现出各向同性的磁行为。扫描透射电子显微镜研究用于证实从Mn到MnAs的转化。

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