Materials Literature
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A model for the dc plasma used in carbon nanotube growth is presented, and one-dimensional simulations of an acetylene/ammonia/argon system are performed. The effect of dc bias is illustrated by examining electron temperature, electron and ion densities, and neutral densities. Introducing a tungsten filament in the dc…
Recent reports of room temperature ferromagnetism in thin films of TiO2 doped with small amounts of cobalt have excited a great deal of interest due to the possible applications of this ferromagnetic, transparent semiconductor to spintronics devices. Ferromagnetism has been reported for TiO2 grown in both the anatase…
A field-emission display (5-in.) using thick-film carbon nanotube emitters is fabricated. A thick-film insulating layer and an emitter layer are employed for low-cost manufacturing and scalability to a large panel. A self-focus cathode for this display is proposed. An auxiliary electrode in contact with the cathode el…
Our study presents experimental results on Co2MnSi thin-film preparation and resulting magnetic properties of the Co2MnSi Heusler alloy. The focus of our work is on the important role of the microstructure and the magnetic properties relationships of Co2MnSi thin films prepared using dc magnetron sputtering. We examin…
We have investigated FexTi1−xO2−δ (x=0.02, 0.06, and 0.08) thin films grown on α-Al2O3 substrates by pulsed-laser deposition. X-ray diffraction results indicate that the films are single phase and of reduced-rutile type. Detailed microstructural observations reveal no measurable magnetic impurities in the films. Vibra…
We have studied the exchange coupling behavior of the epitaxial Nd–Co(11̄00)/Sm–Co exchange-spring bilayers. A shifted and asymmetric magnetic hysteresis loop of Nd–Co was recorded at room temperature with the exchange field Hex=−625 Oe. The magnitude of Hex increases with increasing temperature from 300 to 350 K, whi…
Mn–Zn ferrite thin films were deposited by sputtering a Mn0.6Zn0.4Fe2 alloy target, which was fabricated by powder metallurgy, in a mixture gas of Ar and O2. A 12 nm thick Pt underlayer was deposited at a substrate temperature of 300 °C. All specimen films were prepared in a reactive facing targets sputtering system.…
The magnetocaloric properties of the HoNi2 intermetallic compound are presented. Theoretical results predicted that the crystalline electric field is responsible for the second peak in the magnetic entropy change curve at low temperatures in HoNi2 single crystal oriented in the [100] direction. We present the isotherm…
FePt (for 40–60 at. % Fe) exhibits an order–disorder transformation. The disordered phase is face centered cubic and magnetically soft while the ordered phase is tetragonal and shows high magnetic anisotropy. Since the changes in volume between the two phases are small, it is easy for the soft and hard phases to coexi…
The kinetics of the catalytic reduction of NO by CO on Rh(111) was simulated by using a Monte Carlo algorithm based on a lattice-gas model. The results reported here complement those reported before by incorporating new experimental results which reveal the formation of an N–NO intermediate as necessary for molecular…
In this work, we use Lorentz microscopy imaging technique to study the magnetic domain structure of Fe–55 at %Pd alloy at different stages of atomic ordering. The underlying microstructure is characterized by using conventional transmission electron microscopy. At low annealing temperature, a tweed microstructure is f…
Measures were taken to reduce the generation of particles during the fabrication of tetrahedral amorphous carbon (ta-C) film by the double-bend filtered cathodic vacuum-arc (FCVA) method. Specifically, the use of physical and electrical filters in the plasma path reduced the number of micron-order particles that arriv…
Diamond like carbon (DLC) films were grown using 13.56 and 100 MHz plasma as excitation frequencies in the same plasma enhanced chemical vapor deposition (PECVD) system. Deposition rate, stress, hardness, optical band gap, refractive index, Urbach energy, electrical conductivity, and hydrogen content of these films ha…
Hiperco® 50 alloy heat treated between 450 and 650 °C exhibits superior mechanical properties. We report the measurements of the ac core loss at various frequencies up to 4500 Hz of the Hiperco® 50 alloy samples annealed at 450 and 650 °C. The 650 °C annealed specimens have lower ac core loss than that of the 450 °C a…
Sm–Co/Co and Sm–Co/Fe–Co nanocomposites have been fabricated by electroless plating of Sm–Co powders with Co and Co–Fe, respectively. The influence of electroless plating conditions on the magnetic properties and structure of the coatings were studied. The saturation magnetization (Ms) and morphology of the deposited…
We have studied the magnetization reversal of two-dimensional (2D) arrays of parallel ferromagnetic Fe nanowires in nanoporous alumina templates. Combining bulk magnetization measurements using a superconducting quantum interference device with field-dependent magnetic force microscopy (MFM), we decomposed the macrosc…
Crystal structure of H 3 NCH 2 COOH·H 2 PO 3 was studied in the paraelectric phase (P phase) at 298 K and in the ferroelectric phase (F phase) at 170 K by means of the single crystal neutron diffraction. Two independent protons in the hydrogen bonds forming the H(HPO 3 ) - chains are disordered over two sites with the…
The magnetic, transport, and magneto-optical properties of Ni2MnGa alloy in the martensitic and austenitic states were investigated. The temperature dependence of resistivity shows kinks at the structural and ferroparamagnetic transitions. The temperature dependence of magnetization was also investigated for both the…
We report on the crystal structure of epitaxial (Ga,Mn)N films with Mn=0.2% grown by plasma-enhanced molecular beam epitaxy, exhibiting n-type conductivity and room temperature ferromagnetism (Ms=0.76 emu/cm3, Hc=90 Oe). The additional diffraction spots are found in the zone axis of B=[11̄00] for the (Ga,Mn)N epilayer…
The hysteresis properties of epitaxial SmCo/Co and SmCo/Fe bilayers are calculated by the solution of the Landau–Lifshitz Gilbert equation. The thin film grain structure is taken into account using appropriate finite element techniques. The J(H) curve shows the typical exchange spring behavior for the bilayer if the s…