Magnetic and spin properties of tetrahedral amorphous carbon

Golzan, Mir Maqsood; McKenzie, David R.; Miller, David J.; Collocott, S.J.; Amaratunga, G.A.J.

doi:10.1016/0925-9635(94)00250-9

Cited by 38 publications

(16 citation statements)

References 11 publications

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“…Tetrahedral amorphous carbon (ta-C) has a noncrystalline network structure with a majority of carbon atoms in the sp 3 hybridisation and a low hydrogen content. One of the hardest known glasses, ta-C is optically transparent, 1,2 has a low friction coefficient, 3 a high spin density 4 and is a semiconductor that can be doped ntype. 5 Current applications of ta-C include corrosion barriers in magnetic hard drives, wear-resistant coatings for cutting tools and scratch-resistant layers on optical components.…”

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confidence: 99%

Synthesis of highly tetrahedral amorphous carbon by mixed-mode HiPIMS sputtering

Ganesan

McCulloch

Marks

et al. 2015

J. Phys. D: Appl. Phys.

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Tetrahedral amorphous carbon films with an sp 3 content of 80% have been produced by high power impulse magnetron sputtering (HiPIMS) operating in a mixed sputtering/arc mode. In this mode, short-lived cathode spots form in the magnetic racetrack and produce large numbers of carbon ions. The spots move rapidly, inhibiting the formation of macroparticles. An argon pressure below 2.5 mTorr was critical for obtaining films with high sp 3 content, high stress, large Tauc gap and symmetrical Raman spectra, and all four quantities were strongly correlated.

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confidence: 99%

Synthesis of highly tetrahedral amorphous carbon by mixed-mode HiPIMS sputtering

Ganesan

McCulloch

Marks

et al. 2015

J. Phys. D: Appl. Phys.

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“…The film had a high compressive stress, which allowed it to peel spontaneously from most of the substrate surface [11]. The compaction of these powders into a disk shape gives them the properties of pellet or thick film as their thickness was in excess of one micron [12].…”

Section: Methodsmentioning

confidence: 99%

Frequency dependence of dielectric properties and electrical conductivity of Cu/nano-SnO2 thick film/Cu arrangement

Chenari

Golzan

Sedghi

et al. 2011

Current Applied Physics

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“…This interpretation is consistent with conductivity measurements, which show a sharp increase in conductivity with temperature. However, Golzan 14 observed Curie behavior for temperature from 100 to 150 K for t a-C films. Figure 3 shows the temperature dependence of the ESR linewidths of P ϩ -implanted C 60 films of doses 1ϫ10 12 , 1 ϫ10 13 , 1ϫ10 14 , 1ϫ10 15 , and 5ϫ10 15 P ϩ ions cm Ϫ2 .…”

Section: A Signal Intensity and Spin Susceptibilitymentioning

confidence: 98%

Temperature dependence of electron spin resonance and electrical conductivity in P+-implanted C60 films and their derivatives

Fahim

Kojima

Yamaguchi

et al. 2003

Journal of Applied Physics

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The temperature dependence of electron spin resonance ͑ESR͒ has been measured to clarify the origin and nature of paramagnetic states responsible for the observed ESR signal in P ϩ -implanted C 60 films. Also, the temperature dependence of electrical conductivity was made and compared with ESR linewidths to detect the transport mechanism in these films. The ESR experiments were performed at 9.4 GHz in a wide temperature range from 3.7 to 300 K. The temperature dependence of the ESR signal intensity and spin susceptibility revealed that the unpaired spin follows the Curie law at TϽ20 K, while a clear deviation was observed at TϾ20 K. The Curie behavior of the spin susceptibility results from localized dangling bond electrons, while a deviation occurs due to delocalization and excitation of electrons into states as the temperature increases. The temperature dependence of linewidths indicates that the spin mobility occurs by hopping, taking into account that the electron-phonon interaction as spin relaxation mechanism at TϾT min . The observed minimum in linewidths can be attributed to a decrease in the narrowing effects as the temperature decreases. Finally, the temperature dependence of the electrical conductivity and ESR resonance signal linewidth suggests that the transport mechanism occurs by hopping motion and the unpaired spins are partially localized.

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Magnetic and spin properties of tetrahedral amorphous carbon

Cited by 38 publications

References 11 publications

Synthesis of highly tetrahedral amorphous carbon by mixed-mode HiPIMS sputtering

Synthesis of highly tetrahedral amorphous carbon by mixed-mode HiPIMS sputtering

Frequency dependence of dielectric properties and electrical conductivity of Cu/nano-SnO2 thick film/Cu arrangement

Temperature dependence of electron spin resonance and electrical conductivity in P+-implanted C60 films and their derivatives

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