Spin-disorder-induced angular anisotropy in polarized magnetic neutron scattering

We experimentally report a hitherto unseen angular anisotropy in the polarized small-angle neutron scattering (SANS) cross section of a magnetically strongly inhomogeneous material. Based on an analytical prediction using micromagnetic theory, the difference between the spin-up and spin-down SANS cr...

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Detalhes bibliográficos
Autores: Titov, Ivan, Bersweiler, Mathias, Adams, Michael P., Sinaga, Evelyn Pratami, Rai, Venus, Lišcák, Štefan, Lahr, Max, Schmidt, Thomas L., Kuchkin, Vladyslav M., Haller, Andreas, Suzuki, Kiyonori, Steinke, Nina-Juliane, Alba Venero, Diego, Honecker, Dirk, Kohlbrecher, Joachim, Fernández Barquín, Luis|||0000-0003-4722-3722, Michels, Andreas
Formato: artículo
Fecha de publicación:2025
País:España
Recursos:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/39325
Acesso em linha:https://hdl.handle.net/10902/39325
Access Level:acceso abierto
Descrição
Resumo:We experimentally report a hitherto unseen angular anisotropy in the polarized small-angle neutron scattering (SANS) cross section of a magnetically strongly inhomogeneous material. Based on an analytical prediction using micromagnetic theory, the difference between the spin-up and spin-down SANS cross sections is expected to show a spin-disorder-induced anisotropy. The effect is particularly pronounced in inhomogeneous magnetic materials, such as nanoporous ferromagnets, magnetic nanocomposites, or steels, which exhibit large nanoscale jumps in the saturation magnetization at internal pore-matrix or particle-matrix interfaces. Analysis of the experimental neutron data constitutes a method for determining the exchange-stiffness constant. Our results for the nuclear-magnetic interference terms contained in the polarized magnetic neutron scattering cross section might also be of relevance to other neutron techniques.