Magnetic Compton study of UCoAl
Inquiry number
SOL-0000001171
Beamline
BL08W (High Energy Inelastic Scattering)
Scientific keywords
| A. Sample category | inorganic material |
|---|---|
| B. Sample category (detail) | metal, alloy, superconductor, magnetic material, solid-state crystal |
| C. Technique | inelastic scattering |
| D. Technique (detail) | magnetic scattering, Compton scattering |
| E. Particular condition | polarization (circular), low-T (~ liquid He), magnetic field (> 2 T) |
| F. Photon energy | X-ray (> 40 keV) |
| G. Target information | electronic state, spin/magnetism |
Industrial keywords
| level 1---Application area | storage device |
|---|---|
| level 2---Target | HD,MO |
| level 3---Target (detail) | magnetic layer, magnetic head |
| level 4---Obtainable information | electronic state, magnetic anisotropy |
| level 5---Technique | magnetic scattering, magnetic Compton scattering, PEEM |
Classification
A80.14 magnetic materials, M25.10 magnetic scattering
Body text
Magnetic Compton scattering measurement is an unique technique to study magnetic compounds. Using this technique, one can measure the spin-dependent electron momentum distribution in ferro- and ferrimagnetic compounds. When the MCP can be decomposed into a few partial profiles with the characteristic shape of a specific electronic state, the area under the partial profile gives the partial spin moment associated with that state. The figure shows the magnetic Compton profiles of UCoAl. These data reveal the fact that Co atoms have a significant spin moment with positive sign.
Fig. Magnetic Compton profiles of UCoAl at 5.6K.
[ S. Tsutsui, Y. Sakurai, M. Itou, T. Matsuda, Y. Haga and Y. Onuki, Physica B 359-361, 1117-1119 (2005), Fig. 1,
©2005 Elsevier Science Publisher ]
Source of the figure
Original paper/Journal article
Journal title
Physica B, 359-361 (2005) 1117-1119
Figure No.
1
Technique
When the incident x-rays are circularly polarized, the scattering cross-section contains a spin-dependent term. The experimental extraction of the spin dependence results in a magnetic Compton profile (MCP), Jmag(pz), that is defined as the one-dimensional projection of the spin-polarized electron momentum distribution. The area under the MCP is equal to the total spin moment per formula unit.
where n↑(p) and n↓(p) are the momentum densities of the majority and minority spin bands, respectively.
Source of the figure
No figure
Required time for experimental setup
4 hour(s)
Instruments
| Instrument | Purpose | Performance |
|---|---|---|
| Magnetic Compton Scattering Spectrometer | Magnetic Compton measurement | momentum resolution 0.5 atomic unit |
References
| Document name |
|---|
| S. Tsutsui, Physica B, 359-361 (2005) 1117-1119 |
Related experimental techniques
XMCD, PEEM
Questionnaire
The measurement was possible only in SPring-8. Impossible or very difficult in other facilities.
This solution is an application of a main instrument of the beamline.
Similar experiments account for more than 30% of the beamline's subject.
Ease of measurement
Easy
Ease of analysis
Middle
How many shifts were needed for taking whole data in the figure?
More than ten shifts