Hard X-ray Linear Dichroism Using a Quarter Wave Plate for Structural Characterization of Diluted Magnetic Semiconductors

2007 ◽  
Author(s):  
F. Wilhelm ◽  
E. Sarigiannidou ◽  
E. Monroy ◽  
A. Rogalev ◽  
N. Jaouen ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Linear Dichroism ◽  
Quarter Wave Plate ◽  
X Ray ◽  
Wave Plate ◽  
Quarter Wave ◽  
Diluted Magnetic

Ferromagnetism and Luminescence of Diluted Magnetic Semiconductors GaGdN and AlGdN

2008 ◽  
Vol 1111 ◽  
Author(s):  
Shuichi Emura ◽  
Masahiro Takahashi ◽  
Hiroyuki Tambo ◽  
Akira Suzuki ◽  
Tetsuya Nakamura ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Magnetic Circular Dichroism ◽  
Peak Position ◽  
Magnetic Characteristics ◽  
Sharp Line ◽  
X Ray ◽  
Diluted Magnetic ◽  
X Ray Absorption

AbstractThe magnetic characteristics of the dilute magnetic system GaGdN are investigated by mainly soft-X-ray magnetic circular dichroism (MCD) in energy range of 1160 – 1240 eV. The strong MCD signals up to 30 % at 15K are observed. The temperature dependence of its intensity is not on simple Curie-Weiss curve and depicts three-step curve. A step around 40 – 100K suggests a new magnetic phase. The luminescence spectrum of GaGdN at low temperature is divided into three parts consisting of two broad bands around 432 nm and 503 nm and a sharp peak at 652 nm. This sharp line is assigned to the intra-transition of f – f orbital owing to the weak temperature dependence of the intensity and peak position. AlGdN grown by molecular beam epitaxy produces luminescence at 318.5 nm. X-ray absorption fine structure is examined to survey the occupancy of the Gd ion in the grown specimens.

Growth and characterization of In1−xMnxAs diluted magnetic semiconductors quantum dots

2005 ◽  
Vol 280 (1-2) ◽  
pp. 32-43 ◽  
Author(s):  
Jean-Louis Primus ◽  
Kang-Hoon Choi ◽  
Achim Trampert ◽  
Andrei M. Yakunin ◽  
Jacques Ferré ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Diluted Magnetic

Anomalous Ferromagnetism and Electron Microscopy Characterization of High-Quality Neodymium Oxychlorides Nanocrystals

NANO ◽  
2016 ◽  
Vol 11 (03) ◽  
pp. 1650034
Author(s):  
Xinliang Zheng ◽  
Juan Feng ◽  
Jiarui Zhang ◽  
Hongna Xing ◽  
Jiming Zheng ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
X Ray Diffraction ◽  
High Quality ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Diluted Magnetic ◽  
Microscopy Characterization

High-quality neodymium oxychlorides nanocrystals with cubic shape were synthesized by a nonhydrolytic thermolysis route. The morphology and crystal structure of the neodymium oxychlorides nanocubes were characterized by transmission electron microscopy at the nanoscale. Transmission electron microscope (TEM) image shows that the neodymium oxychlorides nanocrystals are nearly monodispersed with cube-like shape. X-ray diffraction (XRD) and selected area electron diffraction (SAED) patterns of numerous neodymium oxychlorides nanocubes suggest a pure crystal phase with tetragonal PbFCl matlockite structure. HRTEM image of individual neodymium oxychlorides nanocubes indicate that each nanocubes have a single-crystalline nature with high quality. Unlike the anti-ferromagnetism of the bulk, the neodymium oxychlorides nanocubes show clearly anomalous ferromagnetic characteristic at room temperature. This finding provides a new platform for the exploration of diluted magnetic semiconductors, rare earth-based nanomaterials and so on.

scholarly journals X-Ray Magnetic Dichroism in the Cobalt-Doped Indium Tin Oxide from First Principle Calculations

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
V. N. Antonov ◽  
L. V. Bekenov ◽  
L. P. Germash ◽  
N. A. Plotnikov
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
First Principles ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Magnetic Circular Dichroism ◽  
X Ray ◽  
Magnetic Dichroism ◽  
Diluted Magnetic ◽  
X Ray Absorption

The electronic structure of the Co-doped indium tin oxide (ITO) diluted magnetic semiconductors (DMSs) were investigated theoretically from first principles, using the fully relativistic Dirac linear muffin-tin orbital band structure method. The X-ray absorption spectra (XAS) and X-ray magnetic circular dichroism (XMCD) spectra at the Co L3, In M2, Sn M2, and O K edges were investigated theoretically from first principles. The origin of the XMCD spectra in these compounds was examined. The calculated results are compared with available experimental data.

Localization of the dopant in Ge:Mn diluted magnetic semiconductors by x-ray absorption at the Mn K edge

2010 ◽  
Vol 22 (21) ◽  
pp. 216006 ◽  
Author(s):  
R Gunnella ◽  
L Morresi ◽  
N Pinto ◽  
A Di Cicco ◽  
L Ottaviano ◽  
...  
Keyword(s):  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
X Ray ◽  
Diluted Magnetic ◽  
X Ray Absorption

Photoemission and X-ray absorption studies of the electronic structure of GaN-based diluted magnetic semiconductors

2006 ◽  
Vol 243 (7) ◽  
pp. 1696-1700 ◽  
Author(s):  
J. I. Hwang ◽  
Y. Ishida ◽  
M. Kobayashi ◽  
Y. Osafune ◽  
T. Mizokawa ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
X Ray ◽  
Absorption Studies ◽  
Diluted Magnetic ◽  
X Ray Absorption
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