title: Neutron spin-flip scattering of nanocrystalline cobalt.
abstract: We report results of longitudinal (one-dimensional) neutron polarization analysis on polycrystalline bulk Co with an average crystallite size of D = 10 nm. The spin-flip small-angle neutron scattering (SANS) data are analyzed in the approach-to-saturation regime within the framework of micromagnetic theory. In particular, we provide a closed-form expression for the spin-flip SANS cross section [Formula: see text]. From the data analysis, we find a room-temperature value of A = (2.6 ± 0.1) × 10( - 11) J m( - 1) for the exchange-stiffness constant, which agrees well with earlier data.
authors.affiliation: Laboratory for the Physics of Advanced Materials, University of Luxembourg, 162A Avenue de la Faïencerie, L-1511 Luxembourg, Luxembourg.
authors.forename: D
authors.initials: D
authors.lastname: Honecker
authors.forename: F
authors.initials: F
authors.lastname: Döbrich
authors.forename: C D
authors.initials: CD
authors.lastname: Dewhurst
authors.forename: A
authors.initials: A
authors.lastname: Wiedenmann
authors.forename: A
authors.initials: A
authors.lastname: Michels