SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000001032

Beamline

BL39XU (X-ray Absorption and Emission Spectroscopy)

Scientific keywords

A. Sample category	research on method, instrumentation
B. Sample category (detail)	metal, alloy, semiconductor, superconductor, magnetic material, insulator, ceramics, solid-state crystal, amorphous, glass, membrane
C. Technique	absorption and its secondary process
D. Technique (detail)	XAFS, EXAFS, XANES, MCD, LD
E. Particular condition	polarization (circular), high pressure (DAC), extreme low-T (< 4 K), magnetic field (> 2 T)
F. Photon energy	X-ray (4-40 keV)
G. Target information	chemical state, local structure, electronic state, spin/magnetism, phase transition

Industrial keywords

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

Classification

A80.12 semiconductor, A80.14 magnetic materials, A80.20 metal ・material, M40.10 XAFS, 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.XMCD measurement under high magnetic field can be performed by using superconducting magnet (SCM) at BL39XU of SPring-8 because a diamond X-ray phase retarder enables to generate left and right circularly polarized X-rays.

Maximum magnetic field of 10 T can be applied by using this SCM, and sample temperature can be controlled in the range of 2-300 K. Studies on metamagnetism transition in which ferromagnetic state is induced by applying high magnetic field or on ferromagnetic states in the extreme low temperature region are actively performed by installing the SCM. In particular, sample environment under high magnetic field at extreme low temperature is effective to study ferromagnetic compounds including lanthanoid or actinoid elements. Recently, a diamond-anvil-cell (DAC) for generating high pressure is mounted in the SCM (see in Fig. 1) so that the XMCD measurement is performed under extreme conditions of high pressure,high magnetic field, and extreme low temperature.

Fig. 1 Diamond-anvil-cell (DAC) which enables to be mounted in the superconducting magnet
(designed by Dr. Ishimatsu of Hiroshima University).

Fig. 2 shows the XMCD spectrum under high pressure at Pt L₃-edge in ordered-FePt alloy. This is the result under the field of H = 10 T at the pressure of P = 20 GPa at room temperature. Fig. 3 shows pressure dependent of the ratio Lz/Sz of Pt 5d electrons according to magneto-optical sum rules, where Lz and Sz represent the expectation of orbital and spin magnetic moments, respectively. Thus, XMCD spectrum enables to measure under extreme conditions of high magnetic field,high pressure, and extreme low temperature.

Fig.2 Pt L₃-edge XMCD spectrum of ordered-FePt alloy under the field of H = 10 T,
the pressure of P = 20 GPa at room temperature.

Fig. 3 Pressure dependence of Lz/Sz of Pt 5d electrons in ordered-FePt alloy (H = 10 T).

Source of the figure

Private communication/others

Description

広島大学 石松氏から提供

Technique

An X-ray magnetic circular dichroism (XMCD) spectrum is measured by monitoring a small difference in X-ray absorption spectra between for right- and left-circular polarizations. In this solution, X-ray energy was tuned to the characteristic absorption edges of Pt to observe magnetism of the Pt 5d electrons.

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

Source of the figure

Private communication/others

Description

鈴木基寛氏により作成

Required time for experimental setup

6 hour(s)

Instruments

Instrument	Purpose	Performance
10 T superconducting magnet	measuremento of X-ray magnetic circular dichroism spectrum and element specified magnetization process under extreme condition	maximum applied magnetic field of 10 T, temperature range of 2-300 K at sample position

References

Document name
石松直樹、山田真裕、圓山裕、河村直己、第46回 高圧討論会、室蘭工業大学、2P24、2005年10月.
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).
J. Chaboy, C. Piquer, N. Plugaru, M. Artigas, H. Maruyama, N. Kawamura, and M. Suzuki, J. Appl. Phys. 93, 475 (2003).
J. Chaboy, H. Maruyama, N. Kawamura, and M. Suzuki, Phys. Rev. B 69, 014427 (2004).
T. Honma, N. Kawamura, M. Suzuki, M. Mizumaki, H. Maruyama, N. Ishimatsu, Y. Inada, and Y. Onuki, J. Physics: Condensed Matter 15, S2171 (2003).
J. Chaboy, M. A. Laguna-Marco, M. C. Sanchez, H. Maruyama, N. Kawamura, and M. Suzuki, Phys. Rev. B 69, 134421 (2004).
H. Maruyama, N. Ishimatsu, and N. Kawamura, Physica B 351, 328 (2004).
Y. Yamamoto, T. Miura, M. Suzuki, N. Kawamura, H. Miyagawa, T. Nakamura, K. Kobayashi, T. Teranishi, and H. Hori, Phys. Rev. Lett. 93, 116801 (2004).

Related experimental techniques

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.
With user's own instruments.

Ease of measurement

Middle

Ease of analysis

Middle

How many shifts were needed for taking whole data in the figure?

Two-three shifts