Operation of a fast polarization-switching source at the Photon Factory

Tsuchiya, K.; Shioya, Tatsuro; Aoto, Tomohiro; Harada, Kentaro; Obina, T.; Sakamaki, Masako; Amemiya, Kenta

doi:10.1088/1742-6596/425/13/132017

Cited by 20 publications

(9 citation statements)

References 6 publications

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“…With the advent of x-ray FELs in the last 10 years [2][3][4][5], a new era of x-ray science has arrived. Currently, the light source community is continuing to develop more sophisticated schemes in pursuit of, e.g., fast polarization switching [5][6][7][8][9][10][11][12][13][14][15][16][17], full coherence [18][19][20][21][22][23][24], compact x-ray configurations [25][26][27][28], and multicolor operation [29][30].…”

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confidence: 99%

“…Therefore, multiundulator techniques have been developed for high-repetition rate polarization switching: (1) Two canted EPUs simultaneously deliver two angularly distinct photon beams with different polarization states, and the fast polarization switching is accomplished by alternately selecting one of the two angularly separated photon beams with a mechanical chopper [15]. (2) The electron beam is actively switched between two EPUs by a fast kick system and is thus capable of delivering one radiation pulse at a time with different polarization [16]. (3) Adjusting the phase between two successive EPUs changes the intensity of circular polarized radiation and thus allows fast polarization switching from circular to linear in a hybrid undulators system [17].…”

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confidence: 99%

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Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Deng

Zhang

Feng

et al. 2014

Phys. Rev. ST Accel. Beams

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Polarization switching of light sources is required over a wide spectral range to investigate the symmetry of matter. In this paper, we report the first experimental demonstration of the crossed-planar undulators technique at a seeded free-electron laser, which holds great promise for the full control and fast switching of the polarization of short-wavelength radiation. In the experiment, the polarization state of the coherent radiation at the second harmonic of the seed laser is switched successfully. The experimental results confirm the theory and pave the way for applying the crossed-planar undulators technique for seeded x-ray free-electron lasers.

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confidence: 99%

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confidence: 99%

Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Deng

Zhang

Feng

et al. 2014

Phys. Rev. ST Accel. Beams

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“…All the XMCD spectra were recorded at room temperature in the fluorescence-yield mode. The polarization switching between opposite circular polarizations was applied to the XMCD measurement [7,8]. The XMCD measurements were performed in an applied mag- netic field of 500 Oe.…”

Section: Methodsmentioning

confidence: 99%

Observation of Fe/BaTiO<sub>3 </sub>Interface State by X-Ray Absorption Spectroscopy

Sakamaki

Amemiya

2015

e-J. Surf. Sci. Nanotech.

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Electric field-induced change of magnetic properties in ferromagnetic Fe thin film grown on a ferroelectric BaTiO3 (BTO) substrate is studied by means of x-ray absorption spectroscopy. We find that a few nm Fe oxide layer exists at the Fe/BTO interface when the Fe thickness is 8 nm, in which the film shows in-plane magnetization. The x-ray magnetic circular dichroism analysis reveals that the coercive field, Hc, of Fe shows a hysteresis behavior as a function of the electric field, and larger Hc is observed at ∼ ±3 kV/cm. On the other hand, it is found from the extended x-ray absorption fine structure analysis that the Fe-O bond distance shows a similar electric field dependence to that of Hc, and shorter distance is observed at ∼ ±3 kV/cm. Therefore, it is assumed that the Hc strongly depends on the ferroelectric domain structure of BTO, and larger Hc is observed for the multidomain structure. We suppose that shrinking of the Fe-O distance caused by the domain formation leads to an enhancement of Hc due to the island-like localization of the interface Fe oxide.

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“…The polarization switching between opposite circular polarizations was also applied [6,7]. FeCo films with different Fe-Co compositions were grown on a 1 mmthick BTO(001) substrate in a high vacuum chamber by a * This paper was presented at the 7th International Symposium .…”

Section: Methodsmentioning

confidence: 99%

Voltage-Induced Changes in Magnetism of FeCo/BaTiO<sub>3 </sub>Thin Films Studied by X-Ray Absorption Spectroscopy

Amemiya

Sakamaki

2015

e-J. Surf. Sci. Nanotech.

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Voltage-induced changes in the magnetic properties of FeCo thin films grown on a BaTiO3 substrate are investigated by means of the X-ray magnetic circular dichroism (XMCD). The magnetization curves show different effects of the applied voltages depending on the Fe-Co compositions, which are ranging from Fe67Co33 to Fe25Co75. The XMCD spectra suggest that magnetization of the Fe50Co50 film at the saturation state are different between the positive and negative applied voltages, while those for other compositions have no detectable dependence on the applied voltage. The peculiar behavior for Fe50Co50 could be related to the abrupt change in the density of state at the Fermi level.

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Operation of a fast polarization-switching source at the Photon Factory

Cited by 20 publications

References 6 publications

Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Observation of Fe/BaTiO<sub>3 </sub>Interface State by X-Ray Absorption Spectroscopy

Voltage-Induced Changes in Magnetism of FeCo/BaTiO<sub>3 </sub>Thin Films Studied by X-Ray Absorption Spectroscopy

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