SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000001030

Beamline

BL39XU (X-ray Absorption and Emission Spectroscopy)

Scientific keywords

A. Sample category	inorganic material
B. Sample category (detail)	magnetic material
C. Technique	absorption and its secondary process
D. Technique (detail)	XANES, MCD, LD
E. Particular condition	polarization (circular), low-T (~ liquid N2), low-T (~ liquid He), magnetic field (< 2 T), magnetic field (> 2 T), room temperature
F. Photon energy	X-ray (4-40 keV)
G. Target information	electronic state, spin/magnetism, phase transition

Industrial keywords

level 1---Application area	storage device
level 2---Target	HD,MO
level 3---Target (detail)	magnetic layer
level 4---Obtainable information	local structure, electronic state, magnetic moment, magnetic anisotropy
level 5---Technique	XAFS, XMCD

Classification

A80.14 magnetic materials, M40.30 XMCD

Body text

X-ray Magnetic Circular Dichroism (XMCD) is a unique technique to study electronic states for the specific element and its orbital. Using this technique, we can obtain information about the spin polarization of the unoccupied electronic states for the specific element in ferromagnetic materials. The electronic states of 3d transition elements (Cr-Cu), 4f rare-earth elements (La-Lu), and 5d transition elements (Hf-Pt, Au) in ferromagnetic materials can be investigated because circularly polarized X-rays in hard X-ray region (5-16 keV) are available at BL39XU of SPring-8.

The figure shows temperature dependence of XMCD spectra at the Mn K-edge (1s-4p)of Mn₃ZnC. These data demonstrate the fact that Mn 4p electronic states change in response to the magnetic phase transition of Mn₃ZnC and that the magnetic phase transition of Mn₃ZnC is closely related with the variation of 4p orbital moment.

Fig. Temperature variation of Mn K-edge XMCD spectrum in Mn₃ZnC.

[ H. Maruyama, N. Ishimatsu and N. Kawamura, Physica B 351, 328-332 (2004), Fig. 1,
©2004 Elsevier Science Publisher ]

Source of the figure

Original paper/Journal article

Journal title

H. Maruyama et al., Physica B 351, 328 (2004).

Figure No.

Fig. 1

Technique

XMCD spectrum is measured by monitoring the difference in X-ray absorption of the sample between for right- and left-circularly polarized X-rays, as a function of the X-ray energy. In this solution, the information about the spin polarization of Mn 4p unoccupied electronic states can be mainly obtained by measuring XMCD spectra at the Mn K-edge because of the electronic excitation from 1sto4p states.

Fig. Principle of X-ray magnetic circular dichroism (XMCD) measurement.

Source of the figure

Private communication/others

Description

鈴木基寛氏による作成

Required time for experimental setup

5 hour(s)

Instruments

Instrument	Purpose	Performance
Electromagnet and closed-cycle helium refrigerator	measurement of XMCD spectrum at low temperature	maximum applied magnetic field of 2 T, temperature range of 20-300 K at sample position
10 T superconducting magnet	measurement of XMCD spectrum under high magnetic field at extreme low	maximum applied magnetic field of 10 T, temperature range of 2-300 K at sample position
Helicity-modulation XMCD	detection of high accuracy and high sensitivity XMCD signal	dichroic signal less than 0.1% is detectable

References

Document name
H. Maruyama, N. Ishimatsu, and N. Kawamura, Physica B 351, 328 (2004).
S. Uemoto, H. Maruyama, N. Kawamura, S. Uemura, N. Kitamoto, H. Nakao, S. Hara, M. Suzuki, D. Fruchart, and H. Yamazaki, J. Synchrotron Rad. 8, 449 (2001).

Related experimental techniques

Magnetization measurement, X-ray magnetic circular dichroism in soft X-ray resion, X-ray magnetic scattering

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?

Two-three shifts