Materials Literature
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Stress is one of the principal external factors affecting the magnetization of materials. The magnetomechanical effect, that is, the change of magnetization of a magnetic material resulting from the application of stress, has attracted attention because of its scientific complexity. An improved model equation for inte…
Colossal magnetoresistance (CMR) composite materials have been synthesized to explore the possibility of improving magneto-transport and structural properties in CMR systems. In this work we describe (La1−xCaxMnO3)1−y (LCMO) (ZrO2)y (x≈0.3 and 0.0⩽y⩽0.40 mole %) composites that have been synthesized using a modified (…
Cu-alloy films are being explored for integrated circuits, for creating low-resistivity interconnects with stabilized metal/dielectric interfaces via solute segregation, and for interfacial reactions. Here, we describe the pathways of microstructure evolution in supersaturated Cu– 5–12 at. % Mg films, and phase format…
We report on the electronic, transport, and magnetic properties of the Ce-doped manganite, La1−xCexMnO3. This material is remarkably similar to the heavily investigated hole doped manganite La1−xCaxMnO3; e.g., both materials show Curie temperatures of TC∼250 K for x=0.3. The main difference which makes the Ce-doped ma…
In this article we report a chemical synthetic means for generating a high Ku magnetic material—narrowly dispersed nanoparticles of SmCo5. Using Co2(CO)8 and Sm(acac)3 as the precursors under air-free conditions, we produced SmCo5 nanoparticles according to the procedure reported by Sun et al. [Science 287, 1981 (2000…
The magnetic and magnetotransport properties of nanoparticulate magnetite with different grain sizes are investigated using x-ray diffraction, microscopy, magnetometry, and magnetoresistance measurements. The magnetization varies significantly with grain size and is sensitive to preparation conditions. The reduction i…
The evolution of the microstructure, microchemistry, and magnetic properties during slow cooling of melt-spun Sm(Co,Fe,Cu,Zr)z magnets was investigated. It was found that uniform cellular and lamellar structures are formed upon isothermal aging the as-spun ribbons at 850 °C for 3 h, without subsequent slow cooling. No…
Fe 3 O 4 thin films have been directly sputter deposited from a target consisting of a mixture of Fe3O4 and Fe2O3 onto Si and glass substrates. The magnetic properties and microstructures of the films have been characterized and correlated. The columnar growth of the Fe3O4 grains was found to be initialized from the s…
We investigate and discuss the interaction of a hydrogen atom (H) with graphene based on the density functional theory (DFT). Our calculation results show that reconstructions of carbon atoms play an important role in the H adsorption on graphene. When constituent carbon atoms are held rigid, endothermic H adsorption…
ZnO wires were grown by a vapor–liquid–solid phase transport process. Self-assembled Au nano-clusters act as a catalyst or seed for the highly oriented growth of so-called ZnO whiskers on sapphire substrates by a vapor–liquid–solid phase transport process. The ZnO nanowires were more than 500 nm high and smaller than…
Ni/Cu multilayer nanowires have been fabricated by electrodeposition into 6 μm thick nanoporous polycarbonate templates with pore sizes from 30 to 100 nm. The aspect ratio of the magnetic segments was varied from 0.02 (disk shaped) to 50 (rod shaped) with 10–250 Ni/Cu bilayers. The M–H curves show that the magnetic re…
Substitution of Co2+ for a small part of Fe2+ in (MnZn)Fe2O3 results in much smaller temperature variation in core loss, compared with that of conventional MnZn ferrite used for transformers. This effect appears in the temperature dependence of hysteresis loss rather than two other contributions of loss, eddy current…
Detailed ferromagnetic resonance measurements on thin Ni80Fe20 films are described that determine characteristics of intrinsic damping and the effects of intentionally created defects on linewidth. Measurements are made as a function of frequency with magnetization oriented in-plane and normal to the plane. For nomina…
Martensitic Ni-Mn-Ga single crystals are easily twinned and the twin boundaries can be displaced by applying a mechanical stress or magnetic field. Twin boundary motion is a highly dissipative process. Composites of aligned Ni-Mn-Ga particles in a polymer matrix show evidence of stress-induced twin boundary motion tha…
Spectral hole burning reveals a sharp zero-phonon line (ZPL) as well as discrete acoustic phonon sidebands in CdSe nanocrystals. The ZPL linewidth obtained from the spectral hole burning depends strongly on the measurement time scale, reflecting effects of spectral diffusion. The nonlinear optical measurement allows u…
We have investigated the different mechanisms of photoluminescence (PL) of silicon nanocrystals due to the quantum confinement effect (QCE) and interface states. Si nanocrystals were formed by pulsed-laser deposition in inert argon and reactive oxygen gas. The collisions between the ejected species greatly influence t…
We demonstrated the radio-frequency (rf) noise suppressor using soft magnetic films on a coplanar transmission line from 0.1 to 20 GHz. The coplanar transmission line is composed of magnetic film/polyimide/Cu transmission line/seed layer (Cu/Ti)/glass substrate with the dimension of 50 μm width of the signal line and…
Fine flakes of Fe–Si–Al produced by long-duration microforging exhibit a peculiar dual-peak dispersion in their frequency characteristics of the imaginary part of the permeability. This dual dispersion has a high potential to be a electromagnetic noise suppressor, works effectively in the microwave band. In a previous…
In order to reproduce the two-step relaxation observed experimentally in spin-crossover systems, we investigate analytically the static and the dynamic properties of a two-sublattice Ising-like Hamiltonian. The formalism is based on a stochastic master equation approach. It is solved in the mean-field approximation, a…
The temperature-dependent behavior of excitonic photoluminescence observed in ZnO/MgZnO multiple quantum wells (MQWs) in the temperature range of 5–300 K is described. In a ZnO/Mg0.27Zn0.73O MQW grown by laser molecular-beam epitaxy, the luminescence was dominated by localized exciton (LE) emission throughout the whol…