High-density gas aggregation nanoparticle gun applied to the production of SmCo clusters
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We describe in this article the application of a high-density gas aggregation nanoparticle gun to the production and characterization of high anisotropy SmCo nanoparticles. We give a detailed description of the simple but efficient experimental apparatus with a focus on the microscopic processes of the gas aggregation technique. Using high values of gas flux (~45 sccm) we are able to operate in regimes of high collimation of material. In this regime, as we explain in terms of a phenomenological model, the power applied to the sputtering target becomes the main variable to change the size of the clusters. Also presented are the morphological, structural, and magnetic characterizations of SmCo nanoparticles produced using 10 and 50 W of sputtering power. These values resulted in mean sizes of ~12 and ~20 nm. Significant differences are seen in the structural and magnetic properties of the samples with the 50 W sample showing a largely enhanced crystalline structure and magnetic anisotropy.
KeywordsFePt Atomic Vapor Condensation Chamber High Collimation Multilayer Matrix
This study was supported by the Brazilian funding agencies, Fundação de Ampáro a Pesquisa do Estado de São Paulo (FAPESP), and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). The authors thank Professor M.C. Fantini for the x ray diffraction measurements, and the Centro de Ciência e Tecnologia dos Materiais (CCTM-IPEN) for the TEM images.