Spin and Orbital Magnetic Moment of Pd3Co Evaluated by X-Ray Magnetic Diffraction Experiment

2010 ◽  
Vol 459 ◽  
pp. 3-6
Author(s):  
Masahisa Ito ◽  
Yoshiaki Oba ◽  
Ayako Sato ◽  
Kosuke Suzuki ◽  
Tatsuki Tadenuma ◽  
...  
Keyword(s):  
Magnetic Moment ◽  
Reciprocal Lattice ◽  
Form Factors ◽  
Dipole Approximation ◽  
Magnetization Measurement ◽  
Lattice Points ◽  
Diffraction Experiment ◽  
X Ray ◽  
Orbital Magnetic Moment ◽  
Magnetic Form Factors

We have measured spin and orbital magnetic form factors of Pd3Co for various reciprocal lattice points by the X-ray magnetic diffraction. Observed spin and orbital magnetic form factors are fitted by theoretical curves of the isolated atomic model under the dipole approximation. By the fitting analysis we have evaluated separately the spin and orbital component of the magnetic moment of Pd3Co alloy as 2.19 µB/f.u. and 0.83 µB/f.u., respectively. The total magnetic moment 3.02 µB/f.u. is comparable to the value of 2.93 µB/f.u. obtained by the magnetization measurement.

A Study of Spin and Orbital Magnetic Form Factors of CeRh3B2 by X-Ray Magnetic Diffraction

2011 ◽  
Vol 497 ◽  
pp. 3-7 ◽  
Author(s):  
Masahisa Ito ◽  
Ryota Nagayasu ◽  
Tatsuki Tadenuma ◽  
Kosuke Suzuki ◽  
Ayako Sato ◽  
...  
Keyword(s):  
Form Factor ◽  
Form Factors ◽  
Real Space ◽  
Dipole Approximation ◽  
Magnetic Form Factor ◽  
Rare Earth Compound ◽  
X Ray ◽  
Curve Fitting Analysis ◽  
Magnetic Form Factors ◽  
First Time

An experimental method of X-ray magnetic diffraction was applied to the ferromagnetic rare-earth compound CeRh3B2, and its spin and orbital magnetic form factors were measured independently for the first time. Our curve-fitting analysis shows that the orbital magnetic form factor is reproduced by the calculated atomic-model form factor of Ce-4f electrons under the dipole approximation. The comparison of the sum of form factors and the total magnetic form factor measured by the polarized neutron diffraction reveals anisotropic distribution of the magnetic moment in real space.

X-Ray Magnetic Diffraction Experiment of Fe3Pt Alloy in Order Phase

2013 ◽  
Vol 534 ◽  
pp. 3-6 ◽  
Author(s):  
Masahiro Naito ◽  
Kenta Hiiragi ◽  
Ayako Sato ◽  
Hiroshi Maruyama ◽  
Masahisa Ito
Keyword(s):  
Curve Fitting ◽  
Magnetic Moments ◽  
Form Factors ◽  
Dipole Approximation ◽  
Theoretical Studies ◽  
Diffraction Experiment ◽  
X Ray ◽  
Pt Alloy ◽  
Curve Fitting Analysis ◽  
Experimental And Theoretical Studies

We have performed X-ray magnetic diffraction experiments of a ferromagnetic binary alloy Fe3Pt in order phase, and have measured separately spin and orbital magnetic form factors. By a curve-fitting analysis in which atomic-model form factors of Fe-3d and Pt-5d electrons under the dipole approximation are assumed, we have obtained the spin and orbital magnetic moments of Fe and Pt atoms separately. The present result is comparable to those of other experimental and theoretical studies, which shows the validity of this experimental method.

Spin Density Distribution of YTiO3 Observed by X-Ray Magnetic Diffraction

2010 ◽  
Vol 459 ◽  
pp. 7-10
Author(s):  
Kosuke Suzuki ◽  
Masahisa Ito ◽  
Naruki Tsuji ◽  
Hiromichi Adachi ◽  
Hironori Nakao ◽  
...  
Keyword(s):  
Density Distribution ◽  
Spin Density ◽  
Reciprocal Lattice ◽  
Form Factors ◽  
Real Space ◽  
Lattice Points ◽  
Spin Density Distribution ◽  
Ferromagnetic Transition ◽  
X Ray ◽  
The Real

An　X-ray magnetic diffraction (XMD) is applied to ferromagnetic transition metal oxide YTiO3. The spin magnetic form factors are measured for 81 reciprocal lattice points of h0l, hk0 and 0kl series. Three-dimensional spin density distribution in the real space of YTiO3 is successfully obtained by using Maximum Entropy Method (MEM). This is the first result of spin density in the real space by the XMD.

Crystal truncation rod X-ray scattering: exact dynamical calculation

2008 ◽  
Vol 41 (1) ◽  
pp. 18-26 ◽  
Author(s):  
Václav Holý ◽  
Paul F. Fewster
Keyword(s):  
Reciprocal Lattice ◽  
Dynamical Theory ◽  
Lattice Points ◽  
Space Distribution ◽  
Matrix Formalism ◽  
X Ray ◽  
Transmission Coefficients ◽  
X Ray Scattering ◽  
Crystal Truncation Rod ◽  
Scattering Geometry

A new method is presented for a calculation of the reciprocal-space distribution of X-ray diffracted intensity along a crystal truncation rod. In contrast to usual kinematical or dynamical approaches, the method is correct both in the reciprocal-lattice points and between them. In the method, the crystal is divided into a sequence of very thin slabs parallel to the surface; in contrast to the well known Darwin dynamical theory, the electron density in the slabs is constant along the surface normal. The diffracted intensity is calculated by a matrix formalism based on the Fresnel reflection and transmission coefficients. The method is applicable for any polarization of the primary beam and also in a non-coplanar scattering geometry.

Protein crystals can be incommensurately modulated

2008 ◽  
Vol 41 (3) ◽  
pp. 600-605 ◽  
Author(s):  
Jeffrey J. Lovelace ◽  
Cameron R. Murphy ◽  
Lee Daniels ◽  
Kartik Narayan ◽  
Clarence E. Schutt ◽  
...  
Keyword(s):  
Diffraction Pattern ◽  
Reciprocal Lattice ◽  
Lattice Points ◽  
Chemical Crosslinking ◽  
X Ray Diffraction ◽  
X Ray ◽  
Periodic State ◽  
Orientation Matrix ◽  
Aperiodic Crystals ◽  
Future Work

For a normal periodic crystal, the X-ray diffraction pattern can be described by an orientation matrix and a set of three integers that indicate the reciprocal lattice points. Those integers determine the spacing along the reciprocal lattice directions. In aperiodic crystals, the diffraction pattern is modulated and the standard periodic main reflections are surrounded by satellite reflections. The successful indexing and refinement of the main unit cell andqvector usingTWINSOLVE, developed by Svensson [(2003). Lund University, Sweden], are reported here for an incommensurately modulated, aperiodic crystal of a profilin:actin complex. The indexing showed that the modulation is along thebdirection in the crystal, which corresponds to an `actin ribbon' formed by the crystal lattice. Interestingly, the transition to the aperiodic state was shown to be reversible and the diffraction pattern returned to the periodic state during data collection. It is likely that the protein underwent a conformational change that affected the neighbouring profilin:actin molecules in such a way as to produce the observed modulation in the diffraction pattern. Future work will aim to trap the incommensurately modulated crystal state, for example using cryocooling or chemical crosslinking, thus allowing complete X-ray data to be collected.

scholarly journals Nucleon Axial and Electromagnetic Form Factors

2018 ◽  
Vol 175 ◽  
pp. 06033 ◽  
Author(s):  
Yong-Chull Jang ◽  
Tanmoy Bhattacharya ◽  
Rajan Gupta ◽  
Huey-Wen Lin ◽  
Boram Yoon
Keyword(s):  
Excited States ◽  
Finite Volume ◽  
Magnetic Moment ◽  
Lattice Spacing ◽  
Form Factors ◽  
Electromagnetic Form Factors ◽  
Charge Radii ◽  
Model Independent ◽  
Magnetic Form Factors

We present results for the isovector axial, induced pseudoscalar, electric, and magnetic form factors of the nucleon. The calculations were done using 2 + 1 + 1-flavor HISQ ensembles generated by the MILC collaboration with lattice spacings a ≈ 0.12, 0.09, 0.06 fm and pion masses Mπ ≈ 310, 220, 130 MeV. Excited-states contamination is controlled by using four-state fits to two-point correlators and by comparing two-versus three-states in three-point correlators. The Q2 behavior is analyzed using the model independent z-expansion and the dipole ansatz. Final results for the charge radii and magnetic moment are obtained using a simultaneous fit in Mπ, lattice spacing a and finite volume.

X-Ray Investigation of Strain Relaxation in Short-Period SimGen Superlattices using Reciprocal Space Mapping

1993 ◽  
Vol 298 ◽  
Author(s):  
P. Hamberger ◽  
E. Koppensteiner ◽  
G. Bauer ◽  
H. Kibbel ◽  
H. Presting ◽  
...  
Keyword(s):  
Strain Relaxation ◽  
Reciprocal Lattice ◽  
Reciprocal Space ◽  
Lattice Points ◽  
Reciprocal Space Mapping ◽  
Double Crystal ◽  
X Ray ◽  
Short Period ◽  
Integrated Intensity ◽  
Strained Layer Superlattices

AbstractThe optoelectronic properties of SimGen strained layer superlattices (SLS's) depend strongly on the structural perfection. We used double crystal and triple axis x-ray diffractometry to characterize the structural properties of short period Si9Ge6 SLS's grown on about lμm thick step-graded SiGe alloy buffers. As grown SLS's and samples annealed subsequently at 550°C, 650°C and 780°C for 60 mmn were investigated. Precise strain data were extracted from two-dimensional reciprocal space maps around (004) and (224) reciprocal lattice points. These data were used as refined input parameters for the dynamical simulation of the integrated intensity along the qll[004] direction. Annealing causes interdiffusion as indicated by the decreasing superlattice (SL)-satellite peak intensities and by the change of the Si/Ge thickness ratio. However, the full width at half maximum of the SL satellite peaks does not change significantly with annealing up to 650°C. The in-plane SL lattice constant in both samples is increased only slighty by annealing (< 9×10−3 Å). Consequently the interface intermixing due to interdiffusion is the main cause for the shift of the luminescence energy to higher values in these annealed samples.

scholarly journals Study of spin and orbital magnetic form factors of CeRh3B2by X-ray magnetic diffraction

2008 ◽  
Vol 64 (a1) ◽  
pp. C572-C572
Author(s):  
T. Tadenuma ◽  
K. Suzuki ◽  
Y. Oba ◽  
K. Kitani ◽  
N. Tsuji ◽  
...  
Keyword(s):  
Form Factors ◽  
X Ray ◽  
Magnetic Form Factors

High Resolution X-ray Diffraction of GaN Grown on Sapphire Substrates

1996 ◽  
Vol 449 ◽  
Author(s):  
A. Saxler ◽  
M. A. Capano ◽  
W. C. Mitchel ◽  
P. Kung ◽  
X. Zhang ◽  
...  
Keyword(s):  
Metalorganic Chemical Vapor Deposition ◽  
Reciprocal Lattice ◽  
Chemical Vapor ◽  
Lattice Points ◽  
Structural Quality ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sapphire Substrates ◽  
Primary Mechanism

ABSTRACTX-ray rocking curves are frequently used to assess the structural quality of GaN thin films. In order to understand the information given by the line shape, we need to know the primary mechanism by which the curves are broadened. The GaN films used in this study were grown by low pressure metalorganic chemical vapor deposition (MOCVD) on (00•1) sapphire substrates. GaN films with both broad and very narrow (open detector linewidth of 40 arcseconds for the (00•2) GaN reflection) rocking curves are examined in this work. Reciprocal space maps of both symmetric and asymmetric reciprocal lattice points are used to determine that the cause of the broadening of GaN rocking curves is a limited in-plane coherence length.

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