Observation of bias-dependent low field positive magneto-resistance in Co-doped amorphous carbon films

Abstract

Deposition and field-emission characterization of electrically conductive nitrogen-doped diamond-like amorphous carbon films

Band engineering magneto-resistance effect in Co:a-C films

“…In the previous work, a bias-dependent PMR effect was observed in Co:a-C films that were grown at RT but the effect was not found in films that were grown at 300°C [7]. Fig.…”

“…Since the DOS is relatively low at the bottom of the VB near À12 eV, the dI/dV decreases significantly as voltage increases. The VB structure suggests that the observed bias-dependent MR that is close to V th is likely associated with orbital Zeeman splitting [7]. In an applied magnetic field, the splitting of the Co d-orbital is larger than that of the C porbital.…”

“…Consequently, in TM-doped a-C films, the special magneto-transport properties are attributed to the hybridization between TM (d or f orbitals) and C (sp 2 states). For example, in the previous work [7] the sp 2 states of carbon and the d states of cobalt play a crucial role. However, the origin of the PMR effect remains unclear.…”

“…Amorphous carbon (a-C) films have been regarded as promising candidate materials for various optical, magnetic, and electrical applications [1][2][3][4][5][6][7][8]. Recently, the magneto-properties of carbon-based materials have been intensively studied to determine their suitability for use in carbon spintronic devices [9].…”

Recycling old screen-printed electrodes with newly designed plastic antibodies on the wall of carbon nanotubes as sensory element for in situ detection of bacterial toxins in water

“…The spectra of CNTs showed three main peaks: (i) the D band at 1338 cm −l , originated from the sp 3 -hybridized carbons on the nanotubes; (ii) the G band at 1575 cm −l , attributed to the a splitting of the E 2g stretching mode of graphite-like structures, which is relevant to vibration of the sp 2 -bonded carbon atoms in a two-dimensional hexagonal lattice; and (iii) the 2D band at 2657 cm −1 , assigned to the overtone of the D band. The two most important of these bands were the G and the D band, which represented the sp 2 and sp 3 structures [47]. The G band corresponded to the E 2g modes which represented the movement in opposite directions of two neighbouring carbon atoms in a graphite sheet.…”