Development of a soft X-ray magnetic circular dichroism spectrometer using a 1.9 T electromagnet at BL25SU of SPring-8

Nakamura, Tetsuya; Matsuki, Takayuki; Guo, Fang; Matsushita, Teruo; Wakita, Takanori; Hirono, T.; Takeuchi, Yahiko; Kobayashi, Keisuke

doi:10.1016/j.elspec.2005.01.146

Cited by 68 publications

(33 citation statements)

References 11 publications

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“…The XAS and XMCD investigations were performed with the magnetic circular dichroism measurement system at beamline BL25SU [34] of SPring-8. The helicity switching of the circularly polarised radiation was performed by twin helical undulators.…”

Section: Methodsmentioning

confidence: 99%

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Ouardi¹,

Fecher²,

Kubota³

et al. 2015

J. Phys. D: Appl. Phys.

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Abstract.Using circularly polarised radiation and a combination of bulk-sensitive hard X-ray photoelectron spectroscopy and X-ray-absorption spectroscopy (XAS) we studied the electronic and magnetic structure of epitaxial Mn 1.8 Co 1.2 Ga thin films. Spin resolved Bloch spectral functions, density of states as well as charge and magnetisation densities were investigated by a first-principles analysis of full potential, fully relativistic Korringa-Kohn-Rostoker calculations of the electronic structure. The valence states were experimentally investigated by using linear dichroism in the angular distribution and comparing the results to spin-resolved densities of states. The linear dichroism in the valence band enabled a symmetry analysis of the contributing states. The spectra were in good agreement with the theoretical partial density of states. The element-specific, spin-resolved, unoccupied densities of states for Co and Mn were analysed by using XAS and X-ray magnetic circular dichroism (XMCD) at the L 3,2 edges. The spectra were influenced by strong correlation effects. XMCD was used to extract the site resolved magnetic moments. The experimental values of m Mn = 0.7 µ B and m Co = 1.05 µ B agree very well with the calculated magnetic moments. Magnetic circular dichroism in angle-resolved photoelectron spectroscopy at the Mn and Co 2p core level exhibited a pronounced magnetic dichroism and confirmed the localised character of the Mn d valence states.

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Section: Methodsmentioning

confidence: 99%

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Ouardi¹,

Fecher²,

Kubota³

et al. 2015

J. Phys. D: Appl. Phys.

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“…The XMCD measurements were performed using the magnetic circular dichroism measurement system at the BL25SU [29,30] beamline of SPring-8. The helicity switching of the circularly polarized radiation is performed by twin helical undulators.…”

Section: Methodsmentioning

confidence: 99%

Electronic, magnetic, and structural properties of the ferrimagnet Mn2CoSn

et al. 2011

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The magnetic ground state of the Heusler compound Mn2CoSn was predicted to be nearly halfmetallic ferrimagnetic with a high spin polarization by ab initio electronic structure calculations.Mn2CoSn was synthesized, and the magnetic behavior of the compound was studied using SQUID magnetometry and x-ray magnetic circular dichroism. The experimental values were found to be in fair accordance with the theoretical predictions. The electronic structure and the crystal structure of Mn2CoSn were characterized comprehensively using x-ray powder diffraction, 119 Sn Mössbauer spectroscopy, nuclear magnetic resonance, and hard x-ray photoelectron spectroscopy. LBNL Disclaimer

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“…They installed a dedicated measurement vacuum chamber system with an electromagnet that can apply variable magnetic fields of up to 1.9 T to a sample in ultra-high vacuum. 42) By combination of the helicity-switching technique and this apparatus, XMCD measurements at an arbitrary magnetic field and, therefore, the ESMH measurements have become feasible. A schematic drawing of the XMCD apparatus is shown in Fig.…”

Section: Soft-x-ray Regionmentioning

confidence: 99%

“…At the soft-X-ray beamline, BL25SU, helicity switching using the twin helical undulators 38,39) has greatly improved the measurement accuracy of XMCD 40,41) and accomplished an elementspecific magnetic hysteresis measurement (ESMH). 42) The element specificity of XMCD is intensively applied to studies of interfacial spins of exchange bias films for spintronics devices. A depth profile of magnetic moments in the exchange bias bilayers has also been investigated by XMCD experiments in the reflection geometry.…”

Section: Historical Reviewmentioning

confidence: 99%

Recent Progress of the X-ray Magnetic Circular Dichroism Technique for Element-Specific Magnetic Analysis

Nakamura

Suzuki

2013

J. Phys. Soc. Jpn.

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Recent trend of the X-ray magnetic circular dichroism (XMCD) spectroscopy-based technique and the related scientific topics at SPring-8 are reviewed. At the third-generation synchrotron radiation facility, the key developments in the XMCD technique include i) significant improvements in the accuracy and sensitivity of XMCD measurements with a quick helicity switching of circularly polarized X-rays, ii) introduction of extreme conditions (strong pulsed magnetic field and high pressures), and iii) new experimental setup using the high-brilliance X-ray source (microfocusing, reflection geometry, and high-pressure cells). These achievements have effectively extended the capability of the XMCD technique, a unique magnetic probe with an element-specificity, providing fundamental scientific insights in spintronics and magnetic recording devices, magnetic nanoparticles, and magnetism under high-magnetic field and high pressures.KEYWORDS: X-ray magnetic circular dichroism, element specific magnetic hysteresis, synchrotron radiation X-rays Historical ReviewElement-specific magnetic measurements are widely recognized as a powerful experimental technique for the study of magnetic materials and have previously been exploited mainly by Mössbauer spectroscopy. For the last 30 years, an energy-tunable and polarized X-ray source at synchrotron radiation facilities has given rather expansive possibilities of element-specific magnetic measurements using X-ray spectroscopy. Indeed, X-ray magnetic circular dichroism (XMCD) spectroscopy 1,2) has become one of the leading techniques for element-specific magnetic measurement using a resonant effect in the core-shell absorption with circularly polarized X-ray photons.The XMCD effect was first observed at the Fe K edge in the hard-X-ray region in 1987 by Schütz et al.3) In their experiment, an XMCD spectrum of pure iron was obtained by reversing the direction of magnetic fields applied to a sample, and the circularly polarized X-rays were provided by the off-orbital radiation from a bending magnet (off-plane method).3) The recorded XMCD signal was quite small, of the order of ÁI=I $ 5 Â 10 À3 . Subsequently, XMCD spectra at the L 2;3 edges of rare-earth elements [4][5][6] and at the L 2;3 edges of 5d metals in some alloys with 3d transition metals were also reported. 7) XMCD measurements over a wide energy range that is similar to the extended X-ray absorption fine structure (EXAFS), called magnetic EXAFS, in Fe and Gd 3 Fe 5 O 12 showed a capability of analyses of local magnetic structures using dichroic effects. 8,9) In the soft-X-ray region, the first XMCD spectrum at the Ni L 2;3 edges in a Ni single crystal was reported by Chen et al. in 1990. 10) The circularly polarized soft X-rays were obtained by the off-plain method, similar to the previous XMCD measurement at the Fe K edge.3) The intensity of the observed XMCD signal was about 8% with respect to the resonant absorption, the so called white line, and was much larger than that recorded at the K edge. The strong XMCD value at the...

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Development of a soft X-ray magnetic circular dichroism spectrometer using a 1.9 T electromagnet at BL25SU of SPring-8

Cited by 68 publications

References 11 publications

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Electronic, magnetic, and structural properties of the ferrimagnet Mn2CoSn

Recent Progress of the X-ray Magnetic Circular Dichroism Technique for Element-Specific Magnetic Analysis

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Development of a soft X-ray magnetic circular dichroism spectrometer using a 1.9 T electromagnet at BL25SU of SPring-8

Cited by 68 publications

References 11 publications

Magnetic dichroism study on Mn1.8Co1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Magnetic dichroism study on Mn1.8Co1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Electronic, magnetic, and structural properties of the ferrimagnet Mn2CoSn

Recent Progress of the X-ray Magnetic Circular Dichroism Technique for Element-Specific Magnetic Analysis

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Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy

Magnetic dichroism study on Mn_1.8Co_1.2Ga thin film using a combination of x-ray absorption and photoemission spectroscopy