Moreover, the electron beam was observed to influence
the CO. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3072472]“
“Composite magnets were obtained by spark plasma sintering (SPS) consolidation of a mixture of ball-milled powders prepared from nonstoichiometric Nd15Fe79B6 and Nd16Fe78B6 nanocrystalline melt-spun ribbons, and, respectively, Fe77.5Si7.5B15 and Co68.25Fe4.5Si12.25B15 amorphous wires of 100-125 mu m in diameter prepared by in-rotating water click here quenching method. The powders have been mixed in different weight ratios and the consolidation was done at pressures of 50 and 70 MPa, respectively. The addition of FeSiB and CoFeSiB soft magnetic powders increases the remanent magnetization of the SPS magnets from 4.8-5 to 6.2-6.5 kG, while the estimated maximum energy product is also increased
from 24-25 to 27-29 MGOe. The Nd-rich melt-spun ribbons exhibit very large intrinsic coercive fields of over 20 kOe, whereas for the SPS magnets H-i(c) decreases slightly. The profile of the demagnetizing curves is smoother for SPS nanocomposite magnets compared with ball-milled powders, being an indication of a cooperative process in which both exchange coupling between grains and magnetostatic interactions between the powders of hard buy SIS3 and soft magnetic materials are present. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3073932]“
“The formation of the ordered L1(0) structure from the A1 phase in nanocrystalline Fe(100-x)Pd(x) (x = 50-60) and Co(100-x)Pt(x) (x=45-55) alloys is followed
by in situ neutron powder diffraction. The A1 -> L1(0) transformation starts at about 620 and 730 K in Fe(50)Pd(50) and Co(50)Pt(50), respectively, and proceeds selleck inhibitor faster in the Fe-Pd alloys. In both Fe-Pd and Co-Pt, a deviation from the equiatomic composition leads to the deceleration of the ordering process. The magnetic moment of iron in the L1(0) FePd phase decreases with increasing Fe concentration from 3.3 mu(B) in Fe(40)Pd(60) to 3.0 mu(B) in Fe(50)Pd(50). In the Co-Pt alloys, the Co magnetic moment is found to be independent of the composition and degree of chemical order and is equal to 1.9 mu(B). (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3058617]“
“In this paper, we report a synthesis of magnetic porous hollow silica nanotubes (MPHSNTs) using sol-gel method. The MPHSNTs were fabricated by coating Fe(3)O(4) nanoparticles and silica on surfactant hexadecyltrimethylammonium bromide (CTAB) modified CaCO(3) nanoneedles surface under alkaline condition. CaCO(3) nanoneedles and surfactant CTAB are introduced as nanotemplates to form the hollow and porous structures, respectively. After removing CTAB by calcination and etching CaCO(3) nanoneedles away in diluted acetic acid, magnetic porous hollow silica nanotubes with Fe(3)O(4) nanoparticles embedded in the silica shell were achieved.