Photon Factory Activity Report 2004 #22 Part B (2005)
Instrumentation and Technique

15B1/2003G003

Coextensive observation on magnetization and magnetostriction of ironEtsuo ARAKAWA*1, Koichi MORI2, Hidetaka NISHIGAITSU1, Koh-ichi MARUYAMA3, andNoriyuki AIZAWA1
1
Tokyo Gakugei University, Tokyo 184-8501, Japan
2
Ibaraki Prefectural University of Health Sciences, Ibaraki 300-0394, Japan
3
Institute for Molecular Science, Okazaki 444-8585, Japan(a)Normalized Magnetostriction,
λ(H)/λ100 (arb. u.)

Magnetostrictive coefficients have been seldom
observed by X-rays, because the sensitivity was poor.
Recently, a new technique of X-rays has been developed
and overcome the sensitivity [1]. Usually, a confirmation
on saturation magnetization is always necessary tomeasure the quantitative magnetostrictive coefficients.
We noticed that the technique could be extended toobserve the magnetostrictive behaviors during
magnetization process [2, 3]. An extended technique waspossible to observe the magnetostriction as a function ofboth intensities of the magnetic field and themagnetization [2, 3]. We tried to apply the extended new10.50–101(b)Normalized Magnetostriction,
λ(H)/λ100 (arb. u.)

Relative Magnetization,
M(H)/Ms (arb. u.)

10.5

0–10

1

Relative Magnetization,
M(H)/Ms (arb. u.)
Fig. 1. Magnetostrictive behaviors during cyclic magnetization at room
temperature, (a) (100) and (b) (110) specimen surfaces. Solid marks ofcircles and squares were observed when H is ascending. Open marks ofthem indicated the points measured at zero applied magnetic fields.
Solid and broken curves were guides to the eye for ascending anddescending H, respectively. The broken curves were replication of thesolid curves for descending H. After Arakawa et. al, [3].

270

Users' Reporttechnique to iron specimens at room temperature.
White X-rays from a bending magnet weremonochromatized at Fe K absorption edge, 7.111 keV,
1.744 Å, by a Si(331) double-crystal monochromator.
The X-ray beam was incident on the specimen of (100)or (110)-oriented iron single crystal, 99.94+%(Monocrystals Co.) as π-polarization. The beamirradiated area at specimen surface was 2.0 mm horizontal
× 2.0 mm vertical. Each specimen was a disk of 6.0 mm
diameter and 2.0 mm thick in size. The surface side used
was polished sub-micron. The specimen was set on agoniometer so that the iron 200 or 220 symmetry
diffraction, corresponding Bragg angle was 37.4˚ or 59.3˚,
would take place in the horizontal plane. The [001] axis
was set parallel to the vertical direction. The specimen
was magnetized along the [001] axis by an electromagnet
for a resonant X-ray magnetic diffraction in the transverse
configuration of the magnetization. Applied maximum
magnetic fields were 12 kOe. We measured thediffraction intensity with a small sized Si solid-statedetector (SSD) [3].
As shown in Fig. 1, the magnetostrictive behaviors as afunction of the magnetization for the specimens of (100)and (110) planes were observed [3]. The magnetostriction
and the magnetization in the figure were exhibited as
normalized magnetostriction, λ(H)/ λ100, and relative
magnetization, M(H)/ MS, where a parameter H was themagnetic field applied. It should be emphasized that they
were simultaneously observed at exactly coextensive
specimen volumes by X-ray diffraction at arbitrary H [2,3]. Note that the magnetostriction observed in thisconfiguration was converted from its perpendicularcomponent [1, 3].
We would be able to discuss the magnetostrictive
behaviors during cyclic magnetization with this technique[3]. This would be one of the advantage points on ourextended new technique.
The magnetostrictive behaviors of the iron specimensin Fig. 1 also showed dependency on their indices ofdiffraction or surface planes. Our technique was sensitive
to the indices [3]. This would be one of the usefulexamples to apply our new technique.
[1] Etsuo Arakawa et al, accepted in IEEE Trans. Magn.
(2005).
[2] Etsuo Arakawa et. al, submitting to Japan Patent,Patent Application Number 2005-093200 (2005).
[3] Etsuo Arakawa et al, to be submitting.
* arakawae@u-gakugei.ac.jp