scholarly journals Small-angle neutron scattering by the magnetic microstructure of nanocrystalline ferromagnets near saturation

1999 ◽  
Vol 104 (3) ◽  
pp. 261 ◽  
Author(s):  
J. Weissmuller ◽  
R. D. McMichael ◽  
A. Michels ◽  
R. D. Shull
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Magnetic Microstructure ◽  
Nanocrystalline Ferromagnets

Magnetic microstructure of a textured Nd–Fe–B sintered magnet characterized by small-angle neutron scattering

2016 ◽  
Vol 661 ◽  
pp. 110-114 ◽  
Author(s):  
E.A. Périgo ◽  
D. Mettus ◽  
E.P. Gilbert ◽  
P. Hautle ◽  
N. Niketic ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Sintered Magnet ◽  
Magnetic Microstructure

scholarly journals Magnetic microstructure of nanostructured Fe, studied by small angle neutron scattering

1991 ◽  
Vol 6 (11) ◽  
pp. 2305-2311 ◽  
Author(s):  
W. Wagner ◽  
A. Wiedenmann ◽  
W. Petry ◽  
A. Geibel ◽  
H. Gleiter
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Magnetic Alignment ◽  
Microstructural Characteristics ◽  
Magnetic Microstructure ◽  
Magnetic Correlations ◽  
Specimen Volume ◽  
Weakly Magnetic ◽  
Insight Into

Small angle neutron scattering (SANS) was applied to achieve insight into the magnetic correlations in nanostructured Fe. The results confirm the expected microstructure involving ferromagnetic grains and a nonmagnetic or weakly magnetic interface region, the interfaces occupying about half the specimen volume. The SANS measurements further reveal that in nanostructured Fe the magnetic correlations are not confined to single grains, but are extended across the interfaces and result in the alignment of the magnetization over several hundreds of grains. An external field of 1.5 kOe is not sufficient for complete magnetic alignment of the entire specimen. However, the long-range magnetic correlations are considerably disturbed by this field. Reducing the external magnetic field to zero causes the magnetic correlations to resume microstructural characteristics similar to what they had in the original state.

Analysis of the small-angle neutron scattering of nanocrystalline ferromagnets using a micromagnetics model

2001 ◽  
Vol 63 (21) ◽  
Author(s):  
J. Weissmüller ◽  
A. Michels ◽  
J. G. Barker ◽  
A. Wiedenmann ◽  
U. Erb ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Nanocrystalline Ferromagnets

Magnetic Microstructure of a Nanocrystalline Ferromagnet - Micromagnetic Model and Small-Angle Neutron Scattering

1996 ◽  
Vol 457 ◽  
Author(s):  
J. Weissmüller ◽  
R. D. McMichael ◽  
J. Barker ◽  
H. J. Brown ◽  
U. Erb ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Domain Walls ◽  
Anisotropy Field ◽  
Ferromagnetic Material ◽  
Scattering Data ◽  
Convolution Product ◽  
Magnetic Microstructure ◽  
Wide Range

ABSTRACTWe report on a combined theoretical and experimental study of the magnetic microstructure of a single component, single phase, Pore-free nanocrystalline ferromagnetic material. From the equations of micro-magnetics we conclude that the magnetic microstructure is the convolution product of an anisotropy field microstructure and of a response function with a correlation length lH that depends on the applied field Ha. We derive equations for small angle neutron scattering by such structures, and present experimental scattering data for electrodeposited nanocrystalline Ni, the first where for a wide range of Ha the dominant scattering contribution is from the purely magnetic microstructure, not from nuclear or magnetic contrast at pores or second phases. The variation of the scattering cross section with Ha is in excellent agreement with the theory, indicating that the underlying changes in the magnetic microstructure with Ha are not displacements of domain walls, but changes in lH and hence in the magnetic response to an entirely stationary anisotropy field microstructure. At 20K the anisotropy fields are dominated by magnetocrystalline anisotropy, but at 300K the perturbation is from a much stronger interaction which maintains some moments aligned antiparallel to the field direction at Ha as high as 1.4MA/m (18kOe).

Microstructure of die-cast alloys Mg–Zn–Al(–Ca): a study by electron microscopy and small-angle neutron scattering

2003 ◽  
Vol 94 (5) ◽  
pp. 564-571 ◽  
Author(s):  
Michael Vogel ◽  
Oliver Kraft ◽  
Peter Staron ◽  
Helmut Clemens ◽  
Rainer Rauh ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Die Cast ◽  
Cast Alloys
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