Scanning transmission electron microscopy (STEM) study on surface modified CVD diamond/Si(111) film post implanted Fe-B and NiFe-B related to GMR properties

Abstract

Synthesis and characterisation of composite based biohydroxyapatite bovine bone mandible waste (BHAp) doped with 10 wt % amorphous SiO 2 from rice husk by solid state reaction AIP Conference Proceedings 1725, 020009 (2016) (denoted as B-E1D1). Based on FPP measurement at room temperature (RT) and H applied =8 kOe , A-E3D1 sample has MR ratio almost 80% and MR ratio in B-E1D1 sample is 45%. Based on STEM-EDX investigation, there are two aspects of how MR ratio of A-E3D1 more higher than those of B-E1D1. Firstly, surface nanostructure on the top of A-E3D1 film is more grazing than on the top of B-E1D1. Analysis with Scanning Transmission Electron Microscope (STEM) equipped with Electron Energy Loss Spectroscopy (EELS) the growth of amorphous carbon layer on top of the implanted diamond film with thickness around 100 nm and only 20 nm on the no implanted sample have observed. Boron atoms were found inside the carbon amorphous layer distributed homogenously. Secondly, oxygen content at the interface between diamond film and silicon substrate in sample A-E3D1 was lower than those in B-E1D1 sample. This condition gives the resistance value in A-E3D1 lower than value in B-E1D1. This result is close to the Raman Spectroscopy data measurement which obviously suggests changes on the Raman spectrum due to implantation related to Oxygen excitation from B-E1D1 sample.

Polycrystalline Diamond Characterisations for High End Technologies

“…Similarly boron or nitrogen in the precursor gases [46] make the diamond blue [47] or yellow [48][49][50] in colour due to the substitutional atomic defects [51,52] introduced in the diamond lattice [53,54]. Such substitutional defects are studied by [55] photoluminescence (PL) [56][57][58], Fourier transform infra-red (FTIR) spectroscopy techniques [59], whereas the point, line, plane or volume defects during CVD growth can be viewed under transmission electron microscopes (TEM) [60][61][62][63][64][65][66][67][68]. Post-processing steps such as annealing [69,70] may be required to remove some of these defects [71].…”