Volume 113, Issue 21, 07 June 2013
Index of content:
Charge transport and photoresponses in a single-stranded DNA/single-walled carbon nanotube composite film113(2013); http://dx.doi.org/10.1063/1.4808444View Description Hide Description
Electrical conductivity and photoresponse measurements have been carried out on a single-stranded DNA (ssDNA)/single-walled carbon nanotube (SWNT) composite film in comparison to those of a SWNT film. While the temperature-dependent electrical conductivity of the pristine SWNT film was described well by the combined mechanism of a three-dimensional variable-range hopping and hopping conduction, that of the ssDNA/SWNT composite film followed a fluctuation-induced tunneling model. Besides, competition of photoexcited charge carrier generation and oxygen adsorption/photodesorption in the photoresponses of the films was observed and discussed in view of the role of the DNA wrapping. Thus, the biopolymer coating of the SWNTs is shown to play a significant role in modifying the charge dynamics of the composite system.
113(2013); http://dx.doi.org/10.1063/1.4809130View Description Hide Description
The [Pt/Co] multilayers with a very thin Pt layer of 0.2 nm are presented that exhibit strong perpendicular magnetic anisotropy (PMA) even after annealing up to 500 °C. The observed post-annealing stability is in significant contrast to that previously shown for conventional multilayers with a thicker Pt layer than Co, where good PMA properties are obtained in the as-deposited state but they deteriorate significantly at moderate annealing temperatures below ∼300 °C. The reason for the high post-annealing stability is a low level of intermixing during sputtering due to the very thin Pt layer.
113(2013); http://dx.doi.org/10.1063/1.4808239View Description Hide Description
The effect of magnetism on the bulk modulus (B 0) of M 2AlC (M = Ti, V, and Cr) has been studied using first principles calculations. We find that it is possible to identify an energetically favorable magnetic Cr2AlC phase without using any adjustable parameter, such as the Hubbard U. Furthermore, we show that an in-plane spin polarized configuration has substantially lower B 0 as compared to the non-magnetic model. The existences of local magnetic moments on Cr atoms considerably improve agreement between theory and experiment regarding trends in B 0 for M 2AlC phases.