SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000001021

Beamline

BL39XU (X-ray Absorption and Emission Spectroscopy)

Scientific keywords

A. Sample category	inorganic material
B. Sample category (detail)	metal, alloy, magnetic material, nano materials and structures
C. Technique	absorption and its secondary process
D. Technique (detail)	XAFS, MCD, LD
E. Particular condition	polarization (circular), low-T (~ liquid He), magnetic field (> 2 T)
F. Photon energy	X-ray (4-40 keV)
G. Target information	spin/magnetism

Industrial keywords

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

Classification

A80.14 magnetic materials, M40.10 XAFS, M40.30 XMCD

Body text

X-ray magnetic circular dichroism (XMCD) spectroscopy is a unique technique to study magnetism of a particular element in the sample. Using this technique, one can separate magnetization of each elements in a sample that consists of several magnetic elements or magnetic and non-magnetic elements. The technique allows high-sensitive detection of weak magnetization induced in non-magnetic elements, such as Cu, Pt, and Au. The figure shows XMCD spectra of Au particles of 1.9 nm diameter. These data provide a direct evidence for ferromagnetic polarization in Au nanoparticles, although bulk Au is non-magnetic.

Fig. X-ray magnetic circular dichroism (XMCD) spectra in Au nanoparticles, measured at the (a) Au L₃ and (b) L₂ edges.

[ Y. Yamamoto and H. Hori, Journal of the Japanese Society for Synchrotron Radiation Research 18, 3-9 (2005), Fig. 3,
©2005 The Japanese Society for Synchrotron Radiation Research ]

Source of the figure

Original paper/Journal article

Journal title

放射光 vol. 18, No. 1, p. 3 (2005).

Figure No.

Fig. 3

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 Au to observe the magnetism of Au nanoparticles.

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

Source of the figure

Private communication/others

Description

鈴木基寛が作成しました。

Required time for experimental setup

12 hour(s)

Instruments

Instrument	Purpose	Performance
10 T superconducting magnet	XMCD spectroscopy and element-specific magnetometry measurements under high magnetic field	magnetic field ±10 T, sample temerature 1.7-300 K
Helicity-modulation XMCD	detection of XMCD signals with high accuracy and high sensitivity	XMCD signals less than 0.1% are detectable

References

Document name
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).
山本良之, 堀 秀信: 放射光 18, 3 (2005).

Related experimental techniques

SQUID magnetometry

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?

Four-nine shifts