Laboratory for the Physics of Advanced Materials, University of Luxembourg, 162A Avenue de la Faïencerie, L-1511 Luxembourg, Luxembourg.
J Phys Condens Matter. 2011 Jan 12;23(1):016003. doi: 10.1088/0953-8984/23/1/016003. Epub 2010 Dec 6.
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.
我们报告了对平均晶粒尺寸为 D = 10nm 的多晶块状 Co 进行纵向（一维）极化中子分析的结果。在微磁理论框架内，对自旋翻转小角中子散射（SANS）数据在渐近饱和状态下进行了分析。特别是，我们给出了自旋翻转 SANS 截面[公式：见正文]的闭式表达式。通过数据分析，我们发现室温下交换刚度常数 A = (2.6 ± 0.1) × 10(-11)J m(-1)，与早期数据吻合较好。
