Browsing by Subject "Room temperature"

Article

Direct conversion of light-polarization information into electric voltage using photoinduced inverse spin-Hall effect in Pt/GaAs hybrid structure: Spin photodetector

Ando, K.; Morikawa, M.; Trypiniotis, Theodossis; Fujikawa, Y.; Barnes, C. H. W.; Saitoh, E. (2010)

The direct conversion of light-polarization information into electric voltage has been demonstrated using the photoinduced inverse spin-Hall effect in a Pt/GaAs hybrid structure. In the GaAs layer, spin-polarized carriers ...

Article

Efficient electrical spin injection from a magnetic metal/tunnel barrier contact into a semiconductor

Hanbicki, A. T.; Jonker, B. T.; Itskos, Grigorios; Kioseoglou, G.; Petrou, Athos Chariton (2002)

We report electrical spin injection from a ferromagnetic metal contact into a semiconductor light emitting diode structure with an injection efficiency of 30% which persists to room temperature. The Schottky barrier formed ...

Article

Electric control of the spin Hall effect by intervalley transitions

Okamoto, N.; Kurebayashi, H.; Trypiniotis, Theodossis; Farrer, I.; Ritchie, D. A.; Saitoh, E.; Sinova, J.; Mašek, J.; Jungwirth, T.; Barnes, C. H. W. (2014)

Controlling spin-related material properties by electronic means is a key step towards future spintronic technologies. The spin Hall effect (SHE) has become increasingly important for generating, detecting and using spin ...

Article

Magnetic properties of Fe/AlO x/GaAs(001) structures

Vaz, C. A. F.; Ionescu, A.; Trypiniotis, Theodossis; Bland, J. A. C.; Dalgliesh, R. M.; Langridge, S. (2005)

We report results on the effect of the Al Ox barrier layer on the magnetic moment of Fe using polarized neutron reflection. The sample has nominal composition 25 nm Au5 nm Fe1.3 nm Al Ox GaAs (001). The metal deposition ...

Article

The nanostructure, wear and corrosion performance of arc-evaporated CrBxNy nanocomposite coatings

Polychronopoulou, K.; Baker, M. A.; Rebholz, Claus; Neidhardt, J.; O'Sullivan, M.; Reiter, A. E.; Kanakis, K.; Leyland, A.; Matthews, A.; Mitterer, C. (2009)

The composition, nanostructure, tribological and corrosion behaviour of reactive arc evaporated CrBxNy coatings have been studied and compared to CrN. The CrBxNy coatings were deposited on a commercial Oerlikon Balzers RCS ...

Article

Quantitative preparation of 3,4-di(methylene)tetrahydrothiophene-1,1- dioxide by Zn-induced 1,4-debromination. A valuable 6-C reactive diene in [4+2] cycloadditions with DMAD and [60]fullerene

Markoulides, Marios Savva; Ioannou, Charalambos P.; Manos, Manolis J.; Chronakis, Nikos (2012)

Optimum reaction conditions for the quantitative preparation of the highly reactive 3,4-di(methylene)tetrahydrothiophene-1,1-dioxide are described. The method involves the zinc-induced 1,4-debromination of 3,4-bis(bromom ...

Article

Room temperature synthesis and high temperature frictional study of silver vanadate nanorods

Singh, D. P.; Polychronopoulou, K.; Rebholz, Claus; Aouadi, S. M. (2010)

We report the room temperature (RT) synthesis of silver vanadate nanorods (consisting of mainly β-AgVO3) by a simple wet chemical route and their frictional study at high temperatures (HT). The sudden mixing of ammonium ...

Article

Spin transport in germanium at room temperature

Shen, C.; Trypiniotis, Theodossis; Lee, K. Y.; Holmes, S. N.; Mansell, R.; Husain, M.; Shah, V.; Li, X. V.; Kurebayashi, H.; Farrer, I.; De Groot, C. H.; Leadley, D. R.; Bell, G.; Parker, E. H. C.; Whall, T.; Ritchie, D. A.; Barnes, C. H. W. (2010)

Spin-dependent transport is investigated in a Ni/Ge/AlGaAs junction with an electrodeposited Ni contact. Spin-polarized electrons are excited by optical spin orientation and are subsequently used to measure the spin dependent ...

Article

Sulfur doping of M/In2O3 (M=Al,W) nanowires with room temperature near infra red emission

Zervos, Matthew; Mihailescu, C.; Giapintzakis, Ioannis; Othonos, Andreas S.; Travlos, A. (2015)

We have investigated the growth of Al doped In2O3 nanowires via the vapor-liquid-solid mechanism at 800°C using Au as a catalyst. We find that the Al is not incorporated into the cubic bixbyite crystal structure of In2O3 ...

Article

Sulfur doping of M/In2O3 (M=Al,W) nanowires with room temperature near infra red emission

Zervos, Matthew; Mihailescu, C.; Giapintzakis, John; Othonos, A.; Travlos, A. (2015)

We have investigated the growth of Al doped In2O3 nanowires via the vapor-liquid-solid mechanism at 800°C using Au as a catalyst. We find that the Al is not incorporated into the cubic bixbyite crystal structure of In2O3 ...

Article

Synthesis and characterization of water-dispersible, superparamagnetic single-wall carbon nanotubes decorated with iron oxide nanoparticles and well-defined chelating diblock copolymers

Papaphilippou, P.; Turcu, R.; Krasia-Christoforou, T. (2011)

A novel approach for the fabrication of magneto-active carbon nanotubes (CNTs) stabilized in aqueous media, involving the combination of carboxylated single-wall carbon nanotubes (SWCNTs) with a new class of methacrylate-based ...

Article

Thermal conductivity of Ni, Co, and Fe-doped La5Ca 9Cu24O41 thin films measured by the 3ω method

Athanasopoulos, G. I.; Svoukis, E.; Pervolaraki, M.; Saint-Martin, R.; Revcolevschi, A.; Giapintzakis, John (2010)

The effect of Ni-, Co- and Fe-substitution for Cu on the thermal conductivity of La5Ca9Cu24O41 thin films is investigated. Highly b-axis oriented polycrystalline films were grown onto MgO (100) substrates using the pulsed ...

Article

Thermoelectric properties of Bi0.5Sb1.5Te3 thin films grown by pulsed laser deposition

Symeou, E.; Pervolaraki, M.; Mihailescu, C. N.; Athanasopoulos, G. I.; Papageorgiou, C.; Kyratsi, Theodora; Giapintzakis, John (2015)

We report on the pulsed laser deposition of p-type Bi0.5Sb1.5Te3 thin films onto fused silica substrates by ablation of dense targets of Bi0.5Sb1.5Te3 with an excess of 1 wt% Te. We investigated the effect of film thickness, ...

Article

Ultrasonic consolidation and ignition characteristics of thermite composites

Pillai, S. K.; Hadjiafxenti, A.; Doumanidis, C. C.; Ando, T.; Rebholz, Claus (2012)

The fabrication and characterization of metal-based energetic composite materials are currently being examined for a range of new applications. A newly developed ultrasonic consolidation process is used for the synthesis ...

Article

White light emission via cascade Förster energy transfer in (Ga, In)N quantum well/polymer blend hybrid structures

Itskos, Grigorios; Belton, C. R.; Heliotis, G.; Watson, I. M.; Dawson, M. D.; Murray, R.; Bradley, D. D. C. (2009)

We have studied the room-temperature non-radiative energy transfer processes in hybrid structures composed of (Ga, In)N/GaN single quantum wells and semiconducting polymer blend films placed in nanometre-scale proximity. ...