A5056038202- Magnetic Properties and Applications
- Magnetic properties of thin films
- Magnetic Properties of Alloys
- Superconducting Materials and Applications
- Theoretical and Computational Physics
- Metallic Glasses and Amorphous Alloys
- Particle accelerators and beam dynamics
- Banking stability, regulation, efficiency
- Physics of Superconductivity and Magnetism
- Particle Accelerators and Free-Electron Lasers
- Rare-earth and actinide compounds
- Microstructure and Mechanical Properties of Steels
- Global Financial Regulation and Crises
- High-pressure geophysics and materials
- State Capitalism and Financial Governance
- Housing, Finance, and Neoliberalism
- Particle physics theoretical and experimental studies
- Superconductivity in MgB2 and Alloys
- Corporate Finance and Governance
- Climate Change Policy and Economics
- Muon and positron interactions and applications
- Sustainable Finance and Green Bonds
- Corporate Governance and Law
- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties and Synthesis of Ferrites
Edge Hill University
2015-2023
University of Oslo
2012-2023
University of York
2009-2021
University of Sheffield
2014-2018
Ministry of Law and Justice
2015-2017
University of Iceland
2015
Andover Eye Associates
2014
University of Maryland, College Park
2000-2010
Naval Surface Warfare Center
1990-2009
Adelphi Laboratory Center
2009
The magnetostriction (/spl lambda//sub 100/) of b.c.c. Fe is increased over 10-fold at room temperature by the substitution /spl sim/20% gallium for Fe. Fe/sub 1-x/Ga/sub x/ alloys with x between 0.19 and 0.214 that are quenched from 800/spl deg/C exhibit magnetostrictions sim/25% higher than those furnace-cooled 10/spl deg//min. We propose this great increase above in Fe-Ga not due to conventional magnetoelastic effects but substitutive presence asymmetrically shaped clusters Ga atoms. As...
We analyze the coercivity, remanence, and initial magnetization of a single-domain, single-component amorphous material. assume uniform ferromagnetic exchange concentrate on effect single-ion anisotropy. find threshold anisotropy below which coercivity is zero. At large anisotropy, proportional to energy. Exchange pulling increases remanence materials. suggest that between crystallites may also be operative in small-grain metallic polycrystals.
The relationship between diabetes and senbsorineural hearing loss has been disputed. This study compares 44 insulin-dependent diabetics with 38 age sex matched controls. All had pure tone speech audiometry performed, any showing sensorineural deafness undergoing stapedial reflecx decat tests. In 14 reflex tests showed no decay in patient, but seven evidence of recruitment. Analysis vaiance the to be significantly deafer than control population.The affected high frequencies both sexes, also...
Iron-gallium alloys ${\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Ga}}_{x}$ exhibit an exceptional increase in magnetostriction with gallium content. We present small-angle neutron scattering investigations on a ${\mathrm{Fe}}_{0.81}{\mathrm{Ga}}_{0.19}$ single crystal. uncover heterogeneities average spacing of 15 nm and magnetizations distinct from the matrix. The moments around are observed to reorient applied magnetic field or mechanical strain. discuss possible roles played by nanoscale...
The muon anomalous magnetic moment has been measured in a new experiment at Brookhaven. Polarized muons were stored superferric ring, and the angular frequency difference, ${\ensuremath{\omega}}_{a}$, between spin precession orbital frequencies was determined by measuring time distribution of high-energy decay positrons. ratio $R$ ${\ensuremath{\omega}}_{a}$ to Larmor free protons, ${\ensuremath{\omega}}_{p}$, storage-ring field measured. We find...
This letter describes a model of the anisotropy crystalline ferromagnetic alloys containing defect clusters. The focus is on ⟨100⟩-type pairs in bcc lattices each which assigned uniaxial fixed magnitude. lattice also characterized by coherent energy due to transition element host as well an isotropic exchange and magnetic dipole energy. applied study concentration dependence fourfold Keff(C) quenched Fe1−CGaC alloys. It yields Keff(C)∝1−κC4 gives good account Keff C. In particular, it...
Abstract The inverse susceptibility—temperature curves of Mn x Hg 1— Te ( = 0.05, 0.11, 0.17, 0.235) showed a Curie‐Weiss behaviour at high temperatures and downward deviation low temperatures. paramagnetic Curie effective numbers magnetic carriers also deviated from linear dependence on values x. These results were explained in terms cluster model molecular field .
A model is presented which produces a magnetostrictively driven rhombohedral distortion (λ111) in cubic diamond‐like structures. No tetragonal magnetostrictive (λ100) allowed, consistent with the experimental observation, λ111≫λ100. From x‐ray and single crystal measurements we find ‖λ111/λ100‖≳600 for DyFe2. Rhombohedral distortions are examined ternary Tb1−xGexFe2, Tb1−xYxFe2 Tb1−xDyxFe2 systems by methods. The single‐ion nature of giant Tb magnetostriction TbFe2 verified.
Magnetization measurements have been made on four bulk samples (compositions x=.018, .118, .167 and .25) prepared by direct current rapid sputtering. Neutron diffraction show these to be amorphous. All are ferrimagnetic; however, the 17% sample is almost completely compensated at temperatures below 100K. With decreasing Tb‐content, Curie fall from a maximum of 405K for x=.25 value 245K x=.018. Anomalously large coercive fields time dependence magnetizations present low temperatures.
Much contemporary analysis has concluded that the recent financial crisis and bank failures were, among other things, result of a breakdown in corporate governance regimes market discipline. In this context, new regulations advocate such market‐based remedies as tighter investor monitoring greater control over executives' remuneration, order to safeguard stability. We argue approach largely ignores three very important aspects modern markets cannot be constrained through discipline: (i)...
Measurements of the magnetomechanical coupling constant, k, and ΔE effect have been made on Fe71Co9B20 glassy ribbons quenched by a centrifugal spinning method. An X-ray check showed no trace crystallinity. The maximum k were 0.81 more than 2.2, respectively, obtained after field anneal 20 kOe parallel to width ribbon at 384±5°C for 15 min. This relative change in modulus is largest known.
Mössbauer effect measurements were obtained on smooth-surface Fe78B13Si9 amorphous ribbons annealed in a transverse magnetic field at high temperature. Absorption spectra with the ribbon plane tilted several angles respect to direction of γ rays, an external ranging from 0 10 Oe. Intensity ratios analyzed obtain magnetization as function field. A large zero-field spread was deduced and excess scatter near anisotropy observed.
A review is presented of recent results ultrasonic investigations rare earth–iron compounds and alloys. The discussion divided into three sections. first describes sound velocity measurements single crystal Tb0.3Dy0.7Fe2 as a function magnetic field strength orientation with respect to the crystallographic axes. In second part work on polycrystalline amorphous samples, including evidence for simultaneous propagation two different types magnetoelastic waves presented. model developed describe...
Magnetostriction measurements on single crystal and polycrystal TbFe2 ErFe2 are reported compared. For we find the largest known room temperature magnetostriction constant: λ111=2400×10−6. ErFe2: λ111=−300×10−6. λ111 is dominant constant major source of polycrystalline rare earth‐Fe2 alloys. possesses cubic anisotropy constant. At K1=−7.6×107 erg/cm3. The sign plays an important role in determining field dependence magnetostriction.
Abstract The EU is making progress in reducing its carbon footprint. creation of a High-Level Group on Sustainable Finance has supplemented recent market-led initiatives and provided some recommendations for future reform. This article argues that more remains to be achieved. In particular, light the fundamental structural uncertainties attached climate change, precautionary approaches funding GHG-intensive industries are worth contemplating. Such measures include raising capital...
Benign paroxysmal positional vertigo (BPPV) is a common condition which usually managed conservatively, surgical intervention being recommended only for those small number of patients in whom it becomes persistent and incapacitating. The results surgery 13 who underwent posterior semicircular canal occlusion intractable (>12 months duration) incapacitating BPPV are presented with special emphasis on their long-term follow-up. mean follow-up was 66 (range, 29–119 months). All reported...
ABSTRACT There is growing presumption that central banks have a significant role to play in addressing environmental challenges, especially climate change. This article explains, on the basis of both theoretical and empirical evidence, attempting use existing bank tools powers tackle change will prove inadequate issue(s) at hand. From positivist perspective least—and contrary claims made literature—the possess are insufficient make any meaningful contribution emissions reductions prevent...