tailieunhanh - Báo cáo hóa học: " Magnetic Behavior of Surface Nanostructured 50-nm Nickel Thin Films"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Magnetic Behavior of Surface Nanostructured 50-nm Nickel Thin Films | Nanoscale Res Lett 2010 5 1596-1602 DOI s11671-010-9682-2 NANO EXPRESS Magnetic Behavior of Surface Nanostructured 50-nm Nickel Thin Films Prashant Kumar Received 7 May 2010 Accepted 30 June 2010 Published online 21 July 2010 The Author s 2010. This article is published with open access at Abstract Thermally evaporated 50-nm nickel thin films coated on borosilicate glass substrates were nanostructured by excimer laser J cm2 single shot DC electric field up to 2 kV cm and trench-template assisted technique. Nanoparticle arrays anisotropic growth features have been observed to form in the direction of electric field for DC electric field treatment case and ruptured thin film isotropic growth features growth for excimer laser treatment case. For trench-template assisted technique nanowires 70-150 nm diameters have grown along the length of trench template. Coercive field and saturation magnetization are observed to be strongly dependent on nanostructuring techniques. Keywords Magnetic nanostructures Magnetic properties Surface treatment Introduction Fabrication of nanostructured nickel thin films is of importance due to its potential applications in diverse fields such as high density recording media ferrofluid technology spin valves magnetic resonance imaging magnetocaloric refrigeration 1-3 and as catalyst for the growth of carbon nanotubes 4 . The ability to control and manipulate the physical and chemical properties of materials is one of the challenges in nanotechnology. Surface nanostructuring provides a competitive platform for such pursuits. P. Kumar Chemistry and Physics of Materials Unit CPMU Jawaharlal Nehru Centre for Advanced Scientific Research Jakkur P. O. Bangalore 560064 India e-mail prashantkumar@ Moreover thin films coated onto borosilicate glass substrate are amorphous in nature. It has to be crystallized employing some high energy density trigger to functionalize it. Excimer laser nanostructuring of .