Materials Literature
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A compact magnetometer, which uses two nested 1T Halbach cylinders to generate a variable magnetic field of up to 2T in any direction in the xy plane, has two sets of quadrupole pickup coils to detect the components mx and my of the magnetic moment of a sample vibrating along Oz. Sensitivity is 1.10−7Am2 with integrat…
The L10FePt∕Fe2B-type nanocomposite magnets with high coercivity have been obtained in the Febal.Pt30–32B18–20 alloys directly by the melt spinning technique. The as-spun ribbons showed good hard magnetic properties. The remanence, coercivity, and energy product for the Fe52Pt30B18 alloy melt spun at a wheel circumfer…
Spark plasma sintering technique has been applied to synthesize composite Gdx(Gd5Si2Ge2)1−x (x=0.3, 0.5, and 0.7) with layer structure using high-purity gadolinium (Gd) metal and Gd5Si2Ge2 alloys. The magnetocaloric effect of the composites was studied by directly measuring adiabatic temperature change (ΔTad) with a m…
Planar (2-2) and fibular (1-3) composites were fabricated by embedding single crystal Ni49.9Mn29.1Ga21.0 in a polyurethane resin. Magnetic and mechanical testing was performed on all samples. Mechanical testing showed the twin boundary yield stress to be 1.0 and 0.3MPa for the monolithic and composites, respectively.…
In this work the ferromagnetic state in a ferromagnetic insulating manganite viz. Pr0.8Sr0.2MnO3 was analyzed. The temperature variation of ac susceptibility is seen to show two transitions with a high temperature transition occurring at 158K and a low temperature cusp (Tf) around 90K. The high temperature transition…
Zero-field-cooled and field-cooled magnetization data in single-crystalline Nd0.5Sr0.5MnO3 revealed the existence of thermodynamic irreversibility below Curie temperature (TC), indicating the presence of frustration of spins. The imaginary part of ac susceptibility (χ″) indicates a prominent cusp below TC, which shift…
In this paper, we investigate the magnetization reversal in single-phase RE2Fe14B and two-phase α-Fe∕RE2Fe14B with varying nanoscale grain structures and intergranular exchange interactions produced via controlled segregation during crystallization. We show that the loss of coercivity arises because domain-wall proces…
The light-induced bistability under permanent irradiation (LITH: light-induced thermal hysteresis), due to the competition between light irradiation and self-accelerated relaxation, shows crucially rate-dependent hysteresis. Major and minor hysteresis loops for [Fe(PM-BiA)2(NCS)2] spin crossover compound have been mea…
Time–temperature-transformation diagrams describing the A1 to L10 transformation in 1μm thick FePt and FeCuPt alloy films are constructed from data obtained using nonisothermal differential scanning calorimetry in conjunction with a limited number of isothermal anneals. For the FePt alloys, an increase in Pt content f…
Effects of a TiC addition on microstructure and magnetic properties in [MRE2.2Fe14B](100−2x)∕17.2+TixCx(MRE=Nd+Y+Dy,x=1–5) ribbons, melt spun at a wheel speed of 16m∕s, were systematically studied. X-ray diffraction and differential thermal analysis data revealed that the addition of TiC improves the glass formability…
Variable angle spectroscopic ellipsometry (VASE™) is used as a tool to characterize properties such as optical constant, thickness, refractive index depth profile, and pore volume fraction of single and bilayer porous low-k films. The porous films were prepared using sacrificial pore generator (porogen) approach. Two…
Attempts to fill a wide gap in thermal stability between Nd–Fe–B and Sm–Co based magnets by making a conventional hybrid Nd15Fe79B6∕Sm(Co,Fe,Cu,Zr)7.4 type of magnets encountered two technical difficulties: incompatible processes and interdiffusion between two materials. Because a fundamental change in coercivity mech…
Samples of maghemite and cobalt-ferrite nanoparticles (sizes, 3–10nm) were prepared by cross-linking sulfonated polystyrene resin with aqueous solutions of (1) FeCl2, (2) 80%FeCl2+20%CoCl2, (3) FeCl3, and (4) 80%FeCl3+20%CoCl2 by volume. Chemical analysis, x-ray powder-diffraction, and Fe57 Mössbauer spectroscopic mea…
The effect of texture, dispersion, and interaction on transverse susceptibility has been studied. We have developed a model based on the well-known Stoner-Wohlfarth model, by taking into account the texture, the anisotropy field value distribution, and the intergranular magnetic interactions. This model shows a good a…
Hydrogen terminated intrinsic diamond is characterized using photoelectron emission spectroscopy. Samples have been annealed at temperatures Ta from 200to1000°C. The electron emission characteristics can be divided into three regimes: (I) (Ta<300°C) is governed by surface band bending which allows only excitons…
SrFeO 3 − δ belongs to the Ruddlesden-Popper class of systems exhibiting interesting electronic and magnetic properties. Ti4+-doped, oxygen-deficient SrFeO3−δ(SrFexTi1−xO3−δ; x=0.9 and 0.7) samples show canted antiferromagnetic spin ordering, in contrast to the undoped sample (x=1) which is known to exhibit a metallic…
The interceptive deposition method (IDM) was applied to the high-speed pulsed laser deposition (PLD) method with a substrate heating system, and it was clarified that anisotropic Nd-Fe-B thick-film magnets can be obtained under a high deposition rate larger than 20–50μm∕h. The obtained coercivity, remanence, and (BH)m…
This investigation shows that the spark plasma sintering (SPS) method may not only absolutely prevent the formation of intermediate phase α-Fe2O3 but also significantly lower the crystallization temperature of M-type barium hexaferrite. A kind of textured sample composed of major phase M-type barium hexaferrite and tr…
Based on a Monte Carlo simulation method, an improved calculation of the backscattering factor in quantitative analysis by Auger electron spectroscopy has been performed by integrating several aspects of recent progresses in the related fields. The calculation used a general definition of backscattering factor, more a…
A series of polycrystalline multiferroic system Mg0.95Mn0.05Fe2−2xTi2xO4 is prepared by a solid-state reaction route. The effect of Ti+4 substitution in Mg0.95Mn0.05Fe2−2xTi2xO4 has been studied using x-ray diffraction (XRD), Mössbauer spectroscopy, isothermal magnetization hysteresis, temperature dependent dc suscept…