MAGNETIC MICROSPECTROSCOPY BY A COMBINATION OF XMCD AND PEEM

2002 ◽  
Vol 09 (02) ◽  
pp. 877-881 ◽  
Author(s):  
S. IMADA ◽  
S. SUGA ◽  
W. KUCH ◽  
J. KIRSCHNER
Keyword(s):  
Circular Dichroism ◽  
Full Advantage ◽  
Quantitative Evaluation ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
Magnetic Domain ◽  
X Ray ◽  
Circular Dichroïsm

The benefits of combining soft X-ray magnetic circular dichroism and photoelectron microscopy are demonstrated by applying this combination (XMCD–PEEM) not only to magnetic domain imaging but also to quantitative evaluation of the distribution of spin and orbital magnetic moments. The latter takes full advantage of the spectroscopic aspect of XMCD–PEEM.

First principles calculations of intersite disorder influence on the electronic structure and X-ray magnetic circular dichroism in CoFeMnSi Heusler alloy

2020 ◽  
Vol 31 (08) ◽  
pp. 2050109
Author(s):  
S. Uba ◽  
A. Bonda ◽  
L. Uba ◽  
L. V. Bekenov ◽  
V. N. Antonov
Keyword(s):  
Electronic Structure ◽  
Circular Dichroism ◽  
First Principles ◽  
Heusler Alloy ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
X Ray ◽  
The Rich ◽  
X Ray Absorption ◽  
Circular Dichroïsm

Electronic structure, X-ray absorption, and magnetic circular dichroism (XMCD) spectra in the CoFeMnSi Heusler alloy were studied from first principles. Fully relativistic Dirac linear muffin-tin orbital band structure method was implemented with various exchange–correlation functionals tested. The supercell approach was used to study the influence of intersite disorder, at the levels of 6.25%, 12.5%, and 25% within transition metal sites, on the XMCD spectra at [Formula: see text] edges and spin polarization (SP) at the Fermi level. It is found that most sensitive to Fe–Mn and Co–Fe disorder are XMCD spectra at [Formula: see text] edges of Fe, while the sensitivity decreases from Mn to Co. It is shown that magnetic moments estimated with the use of magneto-optical (MO) sum rules agree with the ab initio calculated ones to within [Formula: see text], [Formula: see text], and [Formula: see text], for Co, Fe, and Mn, respectively. The calculated SP decreases from 99% for ordered CoFeMnSi alloy, to 96% upon 25% Co–Fe disorder, to 83% for Fe–Mn disorder, and to 42% in the case of Co–Mn disorder. The calculated spectra agree well with the available experimental data. The rich XMCD spectral structures are predicted from first principles at Fe, Co, Mn and Si [Formula: see text] edges.

Induced Rh magnetic moments in Fe-Rh and Co-Rh alloys using x-ray magnetic circular dichroism

1995 ◽  
Vol 51 (17) ◽  
pp. 12037-12040 ◽  
Author(s):  
G. R. Harp ◽  
S. S. P. Parkin ◽  
W. L. O’Brien ◽  
B. P. Tonner
Keyword(s):  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
X Ray ◽  
Circular Dichroïsm

Induced Magnetic Moments of 4d and 5d Elements in Thin Films and Multilayers by X-Ray Magnetic Circular Dichroism

2014 ◽  
Vol 2 (1) ◽  
pp. 8-13 ◽  
Author(s):  
A. Vlachos ◽  
V. Kapaklis ◽  
M. Angelakeris ◽  
E. Th. Papaioannou ◽  
F. Wilhelm ◽  
...  
Keyword(s):  
Thin Films ◽  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
X Ray ◽  
Circular Dichroïsm

The Effect of Disordering on Magnetic Properties of Fe-Al Alloys

2009 ◽  
Vol 152-153 ◽  
pp. 15-18 ◽  
Author(s):  
E. Voronina ◽  
Eugene P. Yelsukov ◽  
A. Korolyov ◽  
S. Nagamatsu ◽  
T. Fujikawa ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Circular Dichroism ◽  
Mechanical Activation ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
Al Alloys ◽  
Magnetic Characteristics ◽  
X Ray ◽  
Circular Dichroïsm

The results of magnetometric, Mössbauer and XMCD (X-ray Magnetic Circular Dichroism) studies of B2 or DO3–type ordered (25 to 35 at.%Al) and disordered by mechanical activation (35 to 60 at.% Al) Fe-Al alloys are considered. For the description of magnetic characteristics of the studied alloys the validity of local magnetic moments models is discussed. The models suppose that Fe atom local magnetic moments are collinear with magnitude and direction depending on the number of Al atoms in the Fe nearest neighbourhood.

Orientation of Nd and Mn magnetic moments in a CMR Nd0.72Ba0.28MnO3 by X-ray magnetic circular dichroism

1998 ◽  
Vol 190 (3) ◽  
pp. 307-317 ◽  
Author(s):  
O. Toulemonde ◽  
F. Studer ◽  
A. Llobet ◽  
L. Ranno ◽  
A. Maignan ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
X Ray ◽  
Circular Dichroïsm

X-RAY MAGNETIC CIRCULAR DICHROISM ON Pt L-EDGES IN Co-BASED MATERIALS

2005 ◽  
Vol 19 (30) ◽  
pp. 4517-4523 ◽  
Author(s):  
P. POULOPOULOS
Keyword(s):  
Circular Dichroism ◽  
Magnetic Moment ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
Crystallographic Structure ◽  
Third Generation ◽  
X Ray ◽  
Fcc Lattice ◽  
Circular Dichroïsm

Progress in third-generation synchrotron radiation facilities has made possible, nowadays, the determination of induced spin and orbital magnetic moments of 5d transition metal elements via the element-specific X-ray magnetic circular dichroism technique. In this work, recent results on the magnetic moments of Pt in Co -based alloys and multilayers are briefly reviewed. The magnetic moment carried by the 5d electrons of Pt in these systems ranges between 0.2 and 0.7μ B /atom. The ratio of orbital μ L to spin μS magnetic moment is found to be in the range 0.15–0.25. Finally, a method is described for the determination of Pt magnetic moment in lattices other than the fcc lattice, which is the thermodynamically stable crystallographic structure of bulk Pt .

MAGNETIC CIRCULAR DICHROISM IN THE SOFT X-RAY ABSORPTION SPECTRA OF Co-BASED HEUSLER ALLOYS

2002 ◽  
Vol 09 (02) ◽  
pp. 955-960 ◽  
Author(s):  
A. YAMASAKI ◽  
S. IMADA ◽  
S. SUGA ◽  
T. KANOMATA ◽  
S. ISHIDA
Keyword(s):  
Circular Dichroism ◽  
Absorption Spectra ◽  
Magnetic Circular Dichroism ◽  
Magnetic Moments ◽  
Heusler Alloys ◽  
Structure Calculation ◽  
Band Structure Calculation ◽  
X Ray ◽  
X Ray Absorption ◽  
Circular Dichroïsm

Magnetic circular dichroism (MCD) of core-level absorption spectra (XAS) in the soft X-ray region has been measured for the ferromagnetic Heusler alloys Co 2 TiSn , Co 2 ZrSn , and Co 2 NbSn . The Co 2p → 3d XAS–MCD spectra show an obvious contribution of the orbital angular momentum component to the magnetic moment in these alloys. The ratio between the orbital and the spin magnetic moments derived from the MCD spectra varies by more than a factor of 2 within these alloys. The mechanism of this variation is discussed in comparison with the band structure calculation.

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