Size, dimensionality, and shape play important roles in determining the properties of nanomaterials. So far, most nanomaterial researches have been focused on zero-dimensional nanoparticles/nanodots one-dimensional nanowires/nanorods/nanotubes, but very few studies carried out two-dimensional nano-sheets. Starting from carbon, recently we succeeded growing a class nanostructured materials either pure forms or form composites with carbon. In this paper, will first briefly discuss various...

Magnetization properties of magnetic nanowire arrays are studied on various ferromagnetic materials grown in anodic alumina (alumite) and track etched polycarbonate (PCTE) membranes by pulsed electrodeposition. curves were measured as functions wire material, field orientation, length. The coercivity (Hc) remanent squareness (S) the derived from hysteresis loops a function angle (θ) between axis. For PCTE membranes, Hc(θ) for CoNiFe, NiFe, Co all show an otherwise-bell-type variation, while...

Well-aligned carbon nanowalls with a thickness of few nanometers and lateral size in the micrometer range have been grown on various types substrates. The exhibit remarkably different surface morphology as compared to fullerenes nanotubes, particular their two-dimensionality high area. In this work, we focused second aspect developed templating method fabricate class nanostructured materials based novel nanowalls. These structures may potential applications batteries, gas sensors, catalysts,...

Magnetic nanoparticles (Ni, CoNiFe) with diameters ranging from 30 to 200 nm were synthesized by electrodeposition using carbon nanowalls as templates. A series of experiments have been carried out study the formation mechanism nanoparticles. It was found that instead continuous films attributed two key factors, i.e., uneven current density distribution on nanowall surfaces and pulsed supply alternate polarities. The as-grown nanocomposite structures characterized energy-dispersive X-ray...

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHairy Hybrid Nanoparticles of Magnetic Core, Fluorescent Silica Shell, and Functional Polymer BrushesGuoliang Li, Dawn Liming Zeng, Liang Wang, Baoyu, Zong, K. G. Neoh, E. T. Kang*View Author Information Department Chemical & Biomolecular Engineering, National University Singapore, Kent Ridge, Singapore 119260*To whom correspondence should be addressed. E-mail: [email protected]Cite this: Macromolecules 2009, 42, 21, 8561–8565Publication Date...

Poly[N,N‘-(1,4-phenylene)-3,3‘4,4‘-benzophenonetetracarboxylic amic acid] (PAmA) with grafted poly(methyl methacrylate) (PMMA) side chains (PAmA-g-PMMA) was synthesized via thermally induced graft copolymerization of methyl methacrylate (MMA) ozone-pretreated PAmA in the reversible addition-fragmentation chain-transfer (RAFT)-mediated process. The copolymers were characterized by nuclear magnetic resonance (NMR), elemental analysis, X-ray photoelectron spectroscopy (XPS), thermogravimetric...

In this work, the investigation of magnetic proximity effect was extended to Ta which has been reported have a negative spin Hall angle. Magnetoresistance (MR) and measurements for in-plane out-of-plane applied field sweeps were carried out at room temperature. The size MR ratio observed (∼10−5) its magnetization direction dependence are similar that in Pt/yttrium iron garnet, both can be explained by magnetoresistance theory. Additionally, flip polarity is 4 K temperature dependent...

A simple methodology to fabricate soft magnetic FeCoNi granular films from cheap salt solutions viaelectrodeposition at room temperature is demonstrated. With the addition of a small quantity organic and inorganic additives into solutions, nano-granular possess ultra-high permeability, large resistivity, other desirable properties for gigahertz microwave applications. Typically, have coercivity less than 10 or 20 Oe along hard easy axis, respectively, with saturation flux density up 2.43 T....

The arrays of NiFe and CoNiFe nanowires were grown in anodic alumina (alumite) track etched polycarbonate (PCTE) membranes with various pore sizes by pulsed electrodeposition. Magnetic properties the array studied as functions wire material, length, diameter well field orientation. In PCTE membranes, high 0.92 remanent squareness (S) was obtained for 30 nm. However, anisotropy applied out plane is very low, S less than 10%. For alumite same shows a higher anisotropic (H/sub k/) NiFe, leading...

We report the self-assembly of microsized nanowalls and nano-/micropatterns magnetic iron oxides upon oxidation electrodeposited Fe-based films when annealed in air at temperatures ranging from 300 to 450 °C. Scanning electron microscope studies indicate that these have thinnest wall down ∼8 nm with a length up ∼2 μm height reaching ∼6 μm; square patterns an area 0.06−1.0 μm2. The generated can be used detect O2 or H2 high via their resistance change. simple spontaneous synthesizing...

FeCo films with various Fe/Co atomic ratios were deposited by electro-plating method. Microstructure, static magnetic properties and microwave permeability of as-deposited examined. from solution an Fe <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2+</sup> /Co mole ratio 0.7:1 exhibited almost in-plane isotropy a large coercivity Hc about 100 Oe. With the increase in ions concentration plating solution, showed lower well-defined anisotropy....

We propose and demonstrate a concept of multirow-per-track bit patterned media (BPM) recording to overcome the problems encountered with conventional one-row-per-track design. Focused ion beam was used on continuous granular perpendicular magnetic fabricate prototype structures consisting birow tracks sub-100-nm single domain islands two rows be interleaved along track direction, as well an additional nonmagnetic spacer band between adjacent for further aspect ratio (BAR)≥2 adjustment....

For the double exchange-biased IrMn/NiFe/FeMn structures, pinning directions at IrMn/NiFe and NiFe/FeMn interfaces were set either parallel or antiparallel to each other by field annealing. Exchange bias magnetotransport properties in trilayers studied compared with those of bilayers. The dependence exchange on thickness NiFe layer was different for pinnings. A remarkable increase resistance observed which should be attributed domain-wall induced twisted spin structure. configuration...

Field dependence of low frequency noise in tunnel magnetoresistance (TMR) heads with different barrier materials TiO2, Al2O3, and MgO has been studied. It is found that for MgO-TMR heads, the amplitude increases as sensor driven from parallel to antiparallel magnetization configurations. However, this field not magnetic origin can be accounted by coherent tunneling mechanism heads. For TiO2- Al2O3-TMR generally independent when are biased properly hard bias. A spike related a resistance jump...

In this paper, we report magnetic force microscopy (MFM) observations of switching probability individual bit islands in patterned media. The (p) each island was measured by repeated reversal tests at the same experimental conditions for field (SF). It found that there are ~60% with (which is approximately average remnant coercivity, Hcr islands) while rest either switched every time (for magnetically softer or never harder islands). observed statistical behavior an indication thermal...

The high density and speed nonvolatile MTJ MRAMs are reviewed from perspective of the reading writing operation. operation MRAM with different sensing schemes cell array structures is discussed, in particular reference resistance generating which introduced to maximize efficiency reliability. density, low cost cross-point layout analyzed systematically. modes ranging half-select, toggle mode, guided SAF direct writing, thermally assisted spin transfer switching investigated both...

Abstract Commercial electron‐beam resists are modified into semimetallic by doping with 1–3 nm metal nanoparticles, which improve the resolution, contrast, strength, dry‐etching resistance, and other properties of resist. With resists, fine resist nanopatterns from lithography readily converted 5–50 nm, high‐quality multilayers for metallic nanosensors or via ion‐beam etching. This method solves problem fabrication (&lt;50 nm) nanodevices pattern transferring.

A simple methodology to prepare sub-100?nm resist nanopatterns with a high aspect ratio for the transfer of device nanofeatures is demonstrated. The novel method based on two- or multi-step developing process incorporation an ?4?nm thick metal film protect fine in developer solution. Using this approach, different shapes were readily fabricated using positive- and negative-tone electron-beam resists. Subsequently, nanostructures could be converted from these ratio.

The preparation of thin ferromagnetic films with thermally stable properties in the high frequency gigahertz range is crucial for applications different advanced devices. However, it a challenge to attain such as mechanism and correlation between crystallographic structure dynamic magnetic remain unclear. Herein, through an appropriate annealing process involving temperature 510–580 K applied strong field 10 kOe along easy-axis electrodeposited FeCo films, (300–450 nm) are significantly...

Breakthrough <italic>V</italic>_oc up to &gt;1.5 V for polypyrrole-Fe₂O₃ZnO solar-cells is attained from stable dispersions and affected by the reactant type ratio.

A methodology to fabricate ultrasoft CoFe nano-/microfilms directly via electrodeposition from a semineutral iron sulfate solution is demonstrated. Using boron-reducer as the additive, films become very soft with high magnetic moment. Typically, film coercivity in easy and hard axes 6.5 2.5 Oersted, respectively, saturation polarization up an average of 2.45 Tesla. Despite softness, these shining smooth still display high-anisotropic field ~45 Oersted permeability <mml:math...