SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000001172

Beamline

BL25SU (Soft X-ray Spectroscopy of Solid)

Scientific keywords

A. Sample category	inorganic material
B. Sample category (detail)	metal, alloy, magnetic material
C. Technique	absorption and its secondary process
D. Technique (detail)	MCD, LD
E. Particular condition	polarization (circular), ultra-high vacuum, surface, low-T (~ liquid He), magnetic field (< 2 T)
F. Photon energy	soft X-ray
G. Target information	spin/magnetism

Industrial keywords

level 1---Application area	storage device, industrial material
level 2---Target	HD,MO
level 3---Target (detail)	magnetic layer
level 4---Obtainable information	magnetic moment
level 5---Technique	XMCD

Classification

A30.20 surface・interface, A80.14 magnetic materials, M40.40 soft x-ray spectroscopy

Body text

X-ray magnetic circular dichroism (XMCD) is a powerful tool to study magnetic properties of materials. XMCD gives information of electronic state and magnetic moments. Element specificity is inherent at the absorption edges, which is a great advantage of XMCD. Figure shows ESMH of Al₄₀Mn₂₅Fe₁₅Ge₂₀ quasicrystal at the Mn and Fe L_2,3-edges at 25K.At 25K,the magnetic property of Al₄₀Mn₂₅Fe₁₅Ge₂₀ quasicrystal has been characterized as the spin glass system of Tg=41K. A significant difference has been found in the ESMH loops between Mn and Fe in the quasicrystal, where only the Mn loop has an obvious remanent-like magnetization. This result of ESMH has suggested that Mn and Fe magnetic moments have different magnetic viscosity in the spin-glass quasicrystal.

[ T. Nakamura, Y. Yokoyama, N. Kamakura, T. Matsushita, T. Hirono, T. Muro and K. Kobayashi, Nuclear Instruments and Methods in Physics Research B 238, 251-254 (2005), Fig. 2,
©2005 Elsevier Science Publisher ]

Source of the figure

Original paper/Journal article

Journal title

T. Nakamura et al., Nucl. Instr. and Meth. B, 238 (2005) 251-254

Figure No.

2

Technique

XMCD is defined as the difference of absorption coefficients between the left- and right handed circularly polarized soft x-rays .XMCD signal is recorded synchronizing with the helicity switching by 1 Hz using the twin helical undulators. XMCD spectrum and ESMH are obtained by rotating the grating angle and the magnetic field, respectively. The present example was measured using the electromagnet type XMCD spectrometer installed at BL25SU.

[ T. Nakamura, T. Muro, F.-Z. Guo, T. Matsushita, T. Wakita, T. Hirono, Y. Takeuchi and K. Kobayashi, Journal of Electron Spectroscopy and Related Phenomena 144-147, 1035-1038 (2005), Fig. 2,
©2005 Elsevier Science Publisher ]

Source of the figure

Original paper/Journal article

Journal title

T. Nakamura et. al, J. Elecron. Spectrosc. and Relat Phenom. 144-147, 1035-1038 (2005).

Figure No.

1

Required time for experimental setup

4 hour(s)

Instruments

Instrument	Purpose	Performance
Magnetic Circular Dichroism Measurement System (MCD)	Measurements of ESMH	1.9 T, 16K - 300K

References

Document name
T. Nakamura et. al, J. Elecron. Spectrosc. and Relat Phenom. 144-147, 1035-1038 (2005).
T. Muro et al., AIP conference proceedings 705, 1051 (2004).

Related experimental techniques

ESMH using hard x-ray at the BL39XU, VSM, SQUID, PEEM, Kerr effect, Mossbauer spectroscopy

Questionnaire

This solution is an application of a main instrument of the beamline.
Similar experiments account for more than 30% of the beamline's subject.
This solution is application of a new instrument installed in the past two years.

Ease of measurement

Easy

Ease of analysis

Easy

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

Two-three shifts