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Magnetic small-angle neutron scattering on bulk metallic glasses : a feasibility study for imaging displacement fields

Abstract: Magnetic-field-dependent small-angle neutron scattering (SANS) has been utilized to study the magnetic microstructure of bulk metallic glasses (BMGs). In particular, the magnetic scattering from soft magnetic Fe70Mo5Ni5P12.5B2.5C5 and hardmagnetic (Nd60Fe30Al10)(92)Ni-8 alloys in the as-prepared, aged, and mechanically deformed state is compared. While the soft magnetic BMGs exhibit a large field-dependent SANS response with perturbations originating predominantly from spatially varying magnetic anisotropy fields, the SANS cross sections of the hard magnetic BMGs are only weakly dependent on the field, and their angular anisotropy indicates the presence of scattering contributions due to spatially dependent saturation magnetization. Moreover, we observe an unusual increase in the magnetization of the rare-earth-based alloy after deformation. Analysis of the SANS cross sections in terms of the correlation function of the spin misalignment reveals the existence of field-dependent anisotropic long-wavelength magnetization fluctuations on a scale of a few tens of nanometers. We also give a detailed account of how the SANS technique relates to unraveling displacement fields on a mesoscopic length scale in disordered magnetic materials.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Fuente: Phisical Review Materials 1, 074403 (2017)

Editorial: American Physical Society

 Fecha de publicación: 01/11/2017

Nº de páginas: 17

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevMaterials.1.074403

ISSN: 2475-9953,2476-0455

Url de la publicación: https://doi.org/10.1103/PhysRevMaterials.1.074403

Autores/as

METTUS, DENIS

DECKARM, MICHAEL

LEIBNER, ANDREAS

BIRRINGER, RAINER

STOLPE, MORITZ

BUSCH, RALF

HONECKER, DIRK

KOHLBRECHER, JOACHIM

HAUTLE, PATRICK

NIKETIC, NEMANJA

MICHELS, ANDREAS