Measuring the exchange-stiffness constant of nanocrystalline solids by elastic small-angle neutron scattering
Measuring the exchange-stiffness constant of nanocrystalline solids by elastic small-angle neutron scattering
复制标题
DOI：
10.1080/0950083001000180s
复制
发表时间：
2000-12-01
影响因子：
1.2
通讯作者：
Barker, JG
中科院分区：
文献类型：
--
作者：
Michels, A;Weissmüller, J;Barker, JG
在具有非均匀磁晶和/或磁弹性各向异性的铁磁体中，例如纳米晶或冷加工的多晶材料，静态磁性微结构引起弹性磁性小角中子散射（SANS）。本文通过分析弹性SANS截面与外加磁场的关系，探讨了确定交换刚度常数A的方法。实验结果为A和自旋波刚度常数D在冷加工或纳米晶镍和钴被发现同意与文献数据获得的非弹性中子散射单晶标本。
In ferromagnets with a non-uniform magnetocrystalline and/or magnetoelastic anisotropy, such as nanocrystalline or cold-worked polycrystalline materials, the static magnetic microstructure gives rise to elastic magnetic small-angle neutron scattering (SANS). The paper explores a method for determining the exchange-stiffness constant A by analysis of the dependence of the elastic SANS cross-section on the applied magnetic field. Experimental results for A and for the spin-wave stiffness constant D in cold-worked or nanocrystalline Ni and Co are found to agree with literature data obtained by inelastic neutron scattering on single-crystal specimens.