tailieunhanh - Báo cáo hóa học: " Nanoscale chemical and structural study of Cobased FEBID structures by STEM-EELS and HRTEM"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Nanoscale chemical and structural study of Cobased FEBID structures by STEM-EELS and HRTEM | Córdoba et al. Nanoscale Research Letters 2011 6 592 http content 6 1 592 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Nanoscale chemical and structural study of Cobased FEBID structures by STEM-EELS and HRTEM 12 13 12 3 Rosa Córdoba Rodrigo Fernandez-Pacheco Amalio Fernandez-Pacheco Alexandre Gloter César Magén Odile Stéphan3 Manuel Ricardo Ibarra1 2 5 and José María De Teresa1 2 5 Abstract Nanolithography techniques in a scanning electron microscope focused ion beam are very attractive tools for a number of synthetic processes including the fabrication of ferromagnetic nano-objects with potential applications in magnetic storage or magnetic sensing. One of the most versatile techniques is the focused electron beam induced deposition an efficient method for the production of magnetic structures highly resolved at the nanometric scale. In this work this method has been applied to the controlled growth of magnetic nanostructures using Co2 CO 8. The chemical and structural properties of these deposits have been studied by electron energy loss spectroscopy and high-resolution transmission electron microscopy at the nanometric scale. The obtained results allow us to correlate the chemical and structural properties with the functionality of these magnetic nanostructures. Keywords Co deposits FEBID EELS HRTEM Background Despite its great potentiality for the synthesis of well-controlled metallic functional nanostructures for magnetotransport applications the use of focused electron beam induced deposition FEBID 1 2 for such purpose has been quite limited mainly due to the low purity of the deposits grown in this way. Organic precursors are usually dissociated as the source of metallic content resulting in a mixture of carbon metal and oxidized material thus producing inappropriate properties for the desired application in some cases. In the case of cobaltbased deposits Co2 CO 8 is commonly used as the .