SPring-8, the large synchrotron radiation facility

Inquiry number

SOL-0000001128

Beamline

BL29XU (RIKEN Coherent X-ray Optics)

Scientific keywords

A. Sample category	research on method, instrumentation
B. Sample category (detail)	magnetic material
C. Technique	X-ray diffraction
D. Technique (detail)	magnetic scattering, MCD, LD
E. Particular condition	polarization (circular), time-resolved (slow)
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
level 3---Target (detail)	magnetic layer, magnetic head, spin valve
level 4---Obtainable information	magnetic moment
level 5---Technique	XMCD, magnetic scattering, magnetic Compton scattering, PEEM

Classification

A80.14 magnetic materials, M25.10 magnetic scattering, M40.30 XMCD

Body text

In this solution, a galvano optical scanner was applied to switching of X-ray photon helicities at kHz range. The scanner was used to oscillate a diamond crystal of X-ray phase plate quickly and accurately. This technique greatly enhances switching frequency to 2 kHz, from 100 Hz by a existing piezo method. Additionally, degree of circular polarization (P_C) is nearly 100%. The technique can be combined with a lock-in detection to improve experimental accuracy in X-ray magnetic circular dichroism spectroscopy or X-ray magnetic scattering experiments.

Fig. Degree of circular polarization (P_C) as a function of the helicity switching frequency.

[ M. Suzuki, N. Kawamura and T. Ishikawa, Review of Scientific Instruments 74, 19-22 (2003), Fig. 4,
©2003 American Institute of Physics ]

Source of the figure

Original paper/Journal article

Journal title

Rev. Sci. Instrum. 74, 19 (2003).

Figure No.

Fig. 4

Technique

kHz photon helicity switching is performed by oscillating a diamond phase plate crystal using an optical scanner. The figure shows a photograph of a optical scanner mounting a phase plate crystal.

Fig. An optical scanner mounting a diamond phase plate crystal.

[ M. Suzuki, N. Kawamura and T. Ishikawa, Review of Scientific Instruments 74, 19-22 (2003), Fig. 1,
©2003 American Institute of Physics ]

Source of the figure

Original paper/Journal article

Journal title

Rev. Sci. Instrum. 74, 19 (2003).

Figure No.

Fig. 1

Required time for experimental setup

2 shift(s)

Instruments

Instrument	Purpose	Performance
Optical scanner	Oscillating a diamond phase plate crystal	Maximum frequency 2 kHz

References

Document name
M. Suzuki, N. Kawamura, and T. Ishikawa, Rev. Sci. Instrum. 74, 19 (2003).

Related experimental techniques

modulation spectroscopy, helicity modulation technique, XMCD, X-ray magnetic circular dichroism, X-ray magnetic scattering, X-ray magnetic reflectometry

Questionnaire

Ease of measurement

Middle

Ease of analysis

Middle

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

Two-three shifts