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

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 .

Download Full-text

Investigation of Elemental Magnetic Moments of CoCrPt Films Using X-Ray Magnetic Circular Dichroism

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.111.191 ◽

2006 ◽

Vol 111 ◽

pp. 191-0

Author(s):

C.J. Sun ◽

Gan Moog Chow ◽

G.H. Fecher ◽

H.J. Lin ◽

Y. Hwu ◽

...

Keyword(s):

Circular Dichroism ◽

Saturation Magnetization ◽

Magnetic Moment ◽

Sum Rules ◽

Magnetic Circular Dichroism ◽

Magnetic Moments ◽

Total Magnetic Moment ◽

Spin Moment ◽

X Ray ◽

Circular Dichroïsm

The elemental magnetic moments of Co and Cr in CoCrPt films were investigated using xray magnetic circular dichroism (XMCD). The spin and orbital moments of Co was calculated using the sum rules; it was found that the magnetic moment of Co in CoCrPt films was dominated by spin moment contribution. The total magnetic moment of Co was found to be lower than that of bulk Co. Further, the Cr moment was aligned anti-ferromagnetically with respect to Co, resulting in a decrease of saturation magnetization (Ms) in CoCrPt films.

Download Full-text

Element Specific Vector Magnetometry (Esvm) Via Soft X-Ray Magnetic Circular Dichroism

MRS Proceedings ◽

10.1557/proc-375-95 ◽

1994 ◽

Vol 375 ◽

Cited By ~ 1

Author(s):

V. Chakarian ◽

H.-J. Lin ◽

Y. U. Idzerda ◽

E. E. Chaban ◽

G. Meigs ◽

...

Keyword(s):

Circular Dichroism ◽

Magnetic Moment ◽

Magnetization Reversal ◽

Magnetic Circular Dichroism ◽

Magnetic Moments ◽

Magnetic Hysteresis ◽

Magnetic Element ◽

X Ray ◽

Reversal Process ◽

Circular Dichroïsm

AbstractSoft X-Ray Magnetic circular dichroism (SX-MCD) can be used to obtain element-specific magnetic hysteresis curves and to elucidate the two- and three-dimensional magnetization reversal processes for each constituent magnetic element of a heteromagnetic system. As a demonstration, two systems which exhibit in-plane magnetization reversal are studied: a thin Fe (100) singlecrystal film and a Fe1-xCox/Mn/Fel-xCox trilayer. The results for both systems show that the magnetic moment vector reverses via a combination of coherent rotation toward the nearest in-plane magnetically easy axis followed by the formation of orthogonal <100> domains which rapidly sweep across the sample. In the case of the trilayer, the moment reversal process is significantly more complex due to a strong ∼90° coupling between the magnetic moments of the two FeCo layers. By using element-specific vector magnetometry (ESVM), the details of this reversal process are revealed. Furthermore, the results of the SX-MCD for Mn show that Mn possesses a ferromagnetically aligned net magnetic moment which depicts a 2D magnetization behavior different than that for either Fe or Co.

Download Full-text

MAGNETIC MICROSPECTROSCOPY BY A COMBINATION OF XMCD AND PEEM

Surface Review and Letters ◽

10.1142/s0218625x02003093 ◽

2002 ◽

Vol 09 (02) ◽

pp. 877-881 ◽

Cited By ~ 14

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.

Download Full-text

Element specific determination of the magnetic properties of two macrocyclic tetranuclear 3d–4f complexes with a Cu3Tb core by means of X-ray magnetic circular dichroism (XMCD)

Physical Chemistry Chemical Physics ◽

10.1039/c7cp08689j ◽

2018 ◽

Vol 20 (33) ◽

pp. 21286-21293

Author(s):

K. Balinski ◽

L. Schneider ◽

J. Wöllermann ◽

A. Buling ◽

L. Joly ◽

...

Keyword(s):

Magnetic Properties ◽

Circular Dichroism ◽

Magnetic Structure ◽

Magnetic Circular Dichroism ◽

Macrocyclic Complexes ◽

X Ray ◽

Specific Determination ◽

Circular Dichroïsm

We apply X-ray magnetic circular dichroism to study the internal magnetic structure of two very promising star shaped macrocyclic complexes with a CuII3TbIII core.

Download Full-text

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

International Journal of Modern Physics C ◽

10.1142/s0129183120501090 ◽

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.

Download Full-text