Neutron Scattering from the Ferroelectric Fluctuations and Domain Walls of Lead Germanate

1976 ◽  
Vol 36 (14) ◽  
pp. 806-809 ◽  
Author(s):  
R. A. Cowley ◽  
J. D. Axe ◽  
M. Iizumi
Keyword(s):  
Neutron Scattering ◽  
Domain Walls ◽  
Lead Germanate

scholarly journals Observation of Unconventional Dynamics of Domain Walls in Uniaxial Ferroelectric Lead Germanate

2020 ◽  
Vol 30 (21) ◽  
pp. 2000284 ◽  
Author(s):  
Ohheum Bak ◽  
Theodor S. Holstad ◽  
Yueze Tan ◽  
Haidong Lu ◽  
Donald M. Evans ◽  
...  
Keyword(s):  
Domain Walls ◽  
Lead Germanate ◽  
Uniaxial Ferroelectric

Dynamics of plane domain walls in lead germanate and gadolinium molybdate

1990 ◽  
Vol 111 (1) ◽  
pp. 197-206 ◽  
Author(s):  
V. Ya. Shur ◽  
A. L. Gruverman ◽  
V. P. Kuminov ◽  
N. A. Tonkachyova
Keyword(s):  
Domain Walls ◽  
Plane Domain ◽  
Lead Germanate ◽  
Gadolinium Molybdate

The stripe-liquid phase in cuprates and nickelates

2002 ◽  
Vol 12 (9) ◽  
pp. 239-244
Author(s):  
J. M. Tranquada
Keyword(s):  
Liquid Phase ◽  
Neutron Scattering ◽  
Infrared Absorption ◽  
Liquid State ◽  
Domain Walls ◽  
Charge Carriers ◽  
Mid Infrared ◽  
Gap States ◽  
Open Question ◽  
Antiferromagnetic Domains

It is well established that doped 2D antiferromagnets such as layered nickelates and certain cuprates can exhibit an ordered phase in which charge carriers are segregated to periodically-spaced domain walls separating antiferromagnetic domains. An open question concerns the nature of the state that is achieved when a stripe solid melts. Recent neutron scattering experiments on nickelates and cuprates indicate that melting leads to a stripe-liquid state; these results will be presented and discussed. The existence of the stripe-liquid phase in nickelates makes it plausible to interpret the mid-infrared absorption in terms of transitions from valence to mid-gap states associated with the stripes.

Domain walls and small angle neutron scattering in (NdxEr1−x)2Fe14B hard magnets

1992 ◽  
Vol 104-107 ◽  
pp. 1051-1052 ◽  
Author(s):  
A. del Moral ◽  
P.A. Algarabel ◽  
M.R. Ibarra ◽  
J.I. Arnaudas ◽  
J. Schweizer ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Domain Walls ◽  
Hard Magnets

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).

scholarly journals Spin-resolved off-specular neutron scattering from magnetic domain walls using the polarized gas spin filter

2003 ◽  
Vol 335 (1-4) ◽  
pp. 63-67 ◽  
Author(s):  
F. Radu ◽  
A. Vorobiev ◽  
J. Major ◽  
H. Humblot ◽  
K. Westerholt ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Spin Filter ◽  
Magnetic Domain Walls

The direct determination of magnetic domain wall profiles using a split detector STEM

1978 ◽  
Vol 36 (1) ◽  
pp. 466-467
Author(s):  
J.N. Chapman ◽  
P.E. Batson ◽  
E.M. Waddell ◽  
R.P. Ferrier
Keyword(s):  
Electron Microscope ◽  
Domain Wall ◽  
Transmission Electron Microscope ◽  
Domain Walls ◽  
Photographic Plate ◽  
Magnetic Domain ◽  
Direct Determination ◽  
Quantitative Information ◽  
Scanning Transmission Electron Microscope ◽  
Transmission Electron

By far the most commonly used mode of Lorentz microscopy in the examination of ferromagnetic thin films is the Fresnel or defocus mode. Use of this mode in the conventional transmission electron microscope (CTEM) is straightforward and immediately reveals the existence of all domain walls present. However, if such quantitative information as the domain wall profile is required, the technique suffers from several disadvantages. These include the inability to directly observe fine image detail on the viewing screen because of the stringent illumination coherence requirements, the difficulty of accurately translating part of a photographic plate into quantitative electron intensity data, and, perhaps most severe, the difficulty of interpreting this data. One solution to the first-named problem is to use a CTEM equipped with a field emission gun (FEG) (Inoue, Harada and Yamamoto 1977) whilst a second is to use the equivalent mode of image formation in a scanning transmission electron microscope (STEM) (Chapman, Batson, Waddell, Ferrier and Craven 1977), a technique which largely overcomes the second-named problem as well.

Lorentz microscopy study of magnetic domain walls in Fe-Cr-Co alloys

1978 ◽  
Vol 36 (1) ◽  
pp. 462-463
Author(s):  
Yalcin Belli
Keyword(s):  
Domain Walls ◽  
Magnetic Domain ◽  
Microscopy Study ◽  
Ferromagnetic Phase ◽  
Stable Phase ◽  
Magnetic Domains ◽  
Lorentz Microscopy ◽  
Magnetic Hardening ◽  
Electron Microscopes ◽  
Co Alloys

Fe-Cr-Co alloys have great technological potential to replace Alnico alloys as hard magnets. The relationship between the microstructures and the magnetic properties has been recently established for some of these alloys. The magnetic hardening has been attributed to the decomposition of the high temperature stable phase (α) into an elongated Fe-rich ferromagnetic phase (α1) and a weakly magnetic or non-magnetic Cr-rich phase (α2). The relationships between magnetic domains and domain walls and these different phases are yet to be understood. The TEM has been used to ascertain the mechanism of magnetic hardening for the first time in these alloys. The present paper describes the magnetic domain structure and the magnetization reversal processes in some of these multiphase materials. Microstructures to change properties resulting from, (i) isothermal aging, (ii) thermomagnetic treatment (TMT) and (iii) TMT + stepaging have been chosen for this investigation. The Jem-7A and Philips EM-301 transmission electron microscopes operating at 100 kV have been used for the Lorentz microscopy study of the magnetic domains and their interactions with the finely dispersed precipitate phases.

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