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Title: Growth and Characterization of Magnetic MNSB Nanostructures
Keywords: Scanning Tunelling Microscope, MnSb, Nanostructure
Issue Date: 31-Dec-2008
Citation: ZHANG HONGLIANG (2008-12-31). Growth and Characterization of Magnetic MNSB Nanostructures. ScholarBank@NUS Repository.
Abstract: In this study, various MnSb nanostructures have been grown on different substrates, such as HOPG, Si(111) and SiNx in ultrahigh vacuum conditions. We investigated the growth behaviors and surface morphologies of MnSb nanostructures by using in situ scanning tunneling microscopy. In particular, MnSb nano-crystallites and thin films were obtained on HOPG by controlling the growth conditions. The MnSb thin film surface exhibits 2X2 and (root3 X root3 )R30B0 reconstructions on the MnSb(0001) surface, and a 2x1 superstructure on MnSb(10-11 ). When MnSb was grown on Si(111) substrate, an Mn silicide layer could be easily formed by interfacial reaction between Mn and Si. However, by pre-depositing a ultrathin SiNx layers, MnSb nanoparticles with diameters d from 5 to 30 nm could be self-assembled on SiNx/Si(111) with sharp interface. Magnetic measurements indicate that MnSb particles with d<9 nm were superparamagnetic, while those with d>15 nm exhibited ferromagnetism at room temperature.
Appears in Collections:Master's Theses (Open)

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