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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.
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
Leer publicación
METTUS, DENIS
DECKARM, MICHAEL
LEIBNER, ANDREAS
BIRRINGER, RAINER
STOLPE, MORITZ
BUSCH, RALF
HONECKER, DIRK
KOHLBRECHER, JOACHIM
HAUTLE, PATRICK
NIKETIC, NEMANJA
JESUS MARIA RODRIGUEZ FERNANDEZ
LUIS FERNANDEZ BARQUIN
MICHELS, ANDREAS
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