The effects of grain size on magnetic and mechanical properties Dy-free Nd-Fe-B sintered magnets were studied. the was varied by using different sized alloy feedstock powders which ball milled to extents. Increasing milling time from 7 11 h caused average particle decrease 3.6 2.1 µm, while corresponding decreased 5.0 4.0 µm. intrinsic coercivity Hcj maximum energy product (BH)max these increas...

Abstract Modeling the complex interactions of systems particles or agents is a fundamental problem across sciences, from physics and biology, to economics social sciences. In this work, we consider second-order, heterogeneous, multivariable models interacting particles, within simple environments. We describe nonparametric inference framework efficiently estimate latent interaction kernels whic...

coni nanowires were deposited by pulsed electrodeposition technique into porous alumina templates. the effect of off time between pulses (toff) and reductive/oxidative time (treduc/oxid) on the microstructure and magnetic properties of the coni nanowires were investigated. maximum coercivity and squareness were obtained for samples fabricated at treduc/oxid= 0.5 ms and toff =400 ms. the coerciv...

The presence of a narrow shape and size distribution for magnetite crystals within magnetotactic organisms suggests strongly that there are species-specific mechanisms that control the process of biomineralization. In order to explore the extent of this control, cultures of Aquaspirillum magnetotacticum in the exponential growth phase were exposed to increasing magnetic pulses with the aim of s...

CoCrPt films for longitudinal recording media were investigated as a function of substrate bias applied during the deposition. CoCrPt films were deposited on an underlayer stack consisting of glass/NiAl/CrMn with bias applied only during deposition of the CoCrPt layer. A strong dependence of the CoCrPt coercivity on the substrate bias was observed when a thin hexagonal-close-packed CoCrTa templ...

Lorentz microscopy was used to investigate the domain structure in an Fe0.5Co0.5 80Nb4B13Ge2Cu1 alloy annealed at 500, 550, and 610 °C, respectively, for 1 h. The average grain size d, observed by conventional transmission electron microscopy, is 10 nm for the alloy annealed at 500 °C, 18 nm for 550 °C, and 90 nm for 610 °C. The domain structure of sample annealed at 500 °C exhibits few pinning...

A new boundary integral operator is introduced for the solution of the sound-soft acoustic scattering problem, i.e. for the exterior problem for Helmholtz equation with Dirichlet boundary conditions. We prove that this integral operator is coercive in L(Γ) (where Γ is the surface of the scatterer) for all Lipschitz star-shaped domains. Moreover, the coercivity is uniform in the wavenumber k = ω...