scholarly journals Magnetic Properties and X-ray Absorption Fine-Structure Spectra of CoMn2O4 Nanoparticles

2012 ◽  
Vol 10 (0) ◽  
pp. 643-646 ◽  
Author(s):  
Toshiki Miyasaka ◽  
Akinobu Kurokawa ◽  
Hiromasa Takeuchi ◽  
Shinya Yano ◽  
Takuya Yanoh ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Fine Structure ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

scholarly journals Extended X-ray absorption fine structure of bimetallic nanoparticles

2011 ◽  
Vol 2 ◽  
pp. 237-251 ◽  
Author(s):  
Carolin Antoniak
Keyword(s):  
Magnetic Properties ◽  
Fine Structure ◽  
Wavelet Transforms ◽  
Density Functional ◽  
Bimetallic Nanoparticles ◽  
Crystallographic Structure ◽  
Fept Nanoparticles ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

Electronic and magnetic properties strongly depend on the structure of the material, especially on the crystal symmetry and chemical environment. In nanoparticles, the break of symmetry at the surface may yield different physical properties with respect to the corresponding bulk material. A useful tool to investigate the electronic structure, magnetic behaviour and local crystallographic structure is X-ray absorption spectroscopy. In this review, recent developments in the field of extended X-ray absorption fine structure measurements and in the analysis methods for structural investigations of bimetallic nanoparticles are highlighted. The standard analysis based on Fourier transforms is compared to the relatively new field of wavelet transforms that have the potential to outperform traditional analysis, especially in bimetallic alloys. As an example, the lattice expansion and inhomogeneous alloying found in FePt nanoparticles is presented, and this is discussed below in terms of the influence of employed density functional theory calculations on the magnetic properties.

Extended X-Ray Absorption Fine Structure Studies of MnZn-Ferrite Films

1994 ◽  
Vol 375 ◽  
Author(s):  
Paul C. Dorsey ◽  
Vincent G. Harris ◽  
Douglas B. Chrisey ◽  
Peter Lubitz ◽  
James S. Horwitz ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Fine Structure ◽  
Valence State ◽  
Transition Metal Ions ◽  
Metallic Ions ◽  
Mnzn Ferrite ◽  
X Ray ◽  
Absorption Fine ◽  
Ferrite Films ◽  
X Ray Absorption

AbstractThe magnetic properties of MnZn-ferrite are greatly affected by the distribution and valence state of the magnetic and nonmagnetic metallic ions on the tetrahedral (A) and octahedral (B) sites in the spinel ferrite unit cell. A primary factor which can affect the distribution and valence state of the metallic ions is the stoichiometry of the ferrite. In this paper we report on the results of the site occupancy of the transition metal ions in a series of MnZn-ferrite films using extended x-ray absorption fine structure (EXAFS). The EXAFS data are correlated with the film composition and those magnetic properties which are sensitive to the ionic distribution (e.g., magnetic anisotropy field and magnetization) in order to confirm the use of EXAFS as a technique for the investigation of metallic ion distribution in spinel ferrites.

scholarly journals Magnetic and Structural Properties of Fe/Pd Multilayers Studied by Magnetic X-Ray Dichroism and X-Ray Absorption Spectroscopy

1994 ◽  
Vol 375 ◽  
Author(s):  
S. M. Mini ◽  
Eric E. Fullerton ◽  
A. Fontaine ◽  
C. H. Sowers ◽  
A. S. Bommannavar ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Fine Structure ◽  
Saturation Magnetization ◽  
Structural Properties ◽  
Absorption Spectroscopy ◽  
Iron Layer ◽  
Squid Magnetometry ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

AbstractThe results of magnetic circular x-ray dichroism (MCXD) measurements and extended x-ray absorption fine structure measurements (EXAFS) of the Fe K-edges of textured Fe(110)/Pd(111) multilayers are reported. The EXAFS results indicates that the iron in the system goes from bcc to a more densely packed system as the thickness of the iron layer is decreased. The magnetic properties were measured by SQUID magnetometry from 5 - 350 K. For all the samples, the saturation magnetization was significantly enhanced over the bulk values indicating the interface Pd atoms are polarized by the Fe layer. The enhancement corresponds to a moment of ≈2.5μB per interface Pd atom.

Structure of magnetic thin films and nanostructures studied by extended X-ray absorption fine structure

2000 ◽  
Vol 454-456 ◽  
pp. 723-728 ◽  
Author(s):  
H. Magnan ◽  
P. Le Fèvre ◽  
A. Midoir ◽  
D. Chandesris ◽  
H. Jaffrès ◽  
...  
Keyword(s):  
Thin Films ◽  
Fine Structure ◽  
Magnetic Thin Films ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption
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