Determination of the element-specific complex permittivity using a soft x-ray phase modulator

Kubota, Yuya; Hikita, Yasuyuki; Miyawaki, Jun; Akai, H.; Hobara, Rei; Yamamoto, Shûji; Yamamoto, Kohei; Someya, T.; Takubo, Kou; Yokoyama, Yuichi; Araki, Mayuko; Taguchi, M.; Harada, Yoshihisa; Wadati, H.; Tsunoda, Masakiyo; Kinjo, Ryota; Kagamihata, Akihiro; Seike, T.; Takeuchi, Masao; Tanaka, Takashi; Shin, Sung‐Chul; Matsuda, Ichiro

doi:10.1103/physrevb.96.214417

Cited by 11 publications

(16 citation statements)

References 32 publications

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“…As shown in Figure 1, the polarization change of a segmented cross U is much advanced than those of a segmented U and a long U. A segmented cross undulator in SPring-8 BL07LSU can attain polarization switching of 13 Hz (a period of 77 ms) at the experimental station during user operation mode of the storage ring [8]. Moreover, the phase shifter itself has been reported to work even at frequencies higher than 30 Hz (a period of 33 ms) [36].…”

Section: Resultsmentioning

confidence: 99%

“…In this case, all the three phase shifters take the same amount of change but opposite in sign between the center one and the other two. By sinusoidal variation of a phase shift amplitude between π/2 and −π/2 by time with a frequency, ν, the light switches between left-and right-handed circular polarizations through the 45°-tilted linear polarization in one cycle, 1/ν [8]. It is noteworthy that the tilted linear polarization appears in a frequency of 2ν.…”

Section: Simulation a Designmentioning

confidence: 99%

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Segmented Undulator for Extensive Polarization Controls in ≤1 nm-rad Emittance Rings

Matsuda

Yamamoto

Miyawaki

et al. 2019

e-J. Surf. Sci. Nanotechnol.

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We designed a segmented undulator composed of four units of an APPLE undulator, such as an APPLE-II, and three phase-shifters. By simulating the optical performance in a 1-nm-rad emittance ring of synchrotron radiation, the novel undulator generates various polarized light that have high flux, high polarization, and fast-switching with a marginal perturbation to an electron beam in the storage ring. Varieties of polarization combinations in undulator segments allow for novel research, such as experiments using orbital angular momentum in X-ray photons. Furthermore, they provide a high flux third harmonic beam for both linear and circular polarizations, extending the photon energy range significantly at a beamline. The high degree of freedom in polarization controls of the segmented undulator provides opportunities for new experiments with low-emittance synchrotron radiation or X-ray free electron lasers.

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Section: Resultsmentioning

confidence: 99%

Section: Simulation a Designmentioning

confidence: 99%

Segmented Undulator for Extensive Polarization Controls in ≤1 nm-rad Emittance Rings

Matsuda

Yamamoto

Miyawaki

et al. 2019

e-J. Surf. Sci. Nanotechnol.

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“…On the other hand, irradiation of linearly polarized light on a magnetic sample results in magneto-optical Kerr or Faraday effect. The magneto-optical Kerr effect (MOKE) is resonantly enhanced when the probing photon energy is tuned at the absorption edge (X-ray MOKE, XMOKE) [31,42]. These magneto-optical spectroscopies with soft X-ray provide magnetic information of a sample with elementselectivity.…”

Section: Soft X-ray Magneto-optical Spectroscopymentioning

confidence: 99%

“…Figure 23(a) presents the geometric setup for an experiment of longitudinal MOKE (L-MOKE), performed at SPring-8 BL07LSU [31]. A sample, the magnetic heterostructure of Ta/Cu/Fe/MgO, was illuminated by the s-polarized light at an incident angle (ϕ i ) of 80 • with respect to the surface normal.…”

Section: Soft X-ray Magneto-optical Spectroscopymentioning

confidence: 99%

“…Followed by the Introduction (Section 1), we describe, the principle, design, and optimization of the light source in Section 2. In Section 3, we introduce examples of experiments with the polarized soft X-rays that are uniquely operated by SCU [31][32][33]. At last (Section 4), we give future prospects with discussion of the technical improvements of the segmented undulator [34] and the usage in the advanced experiments.…”

Section: Introductionmentioning

confidence: 99%

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Fast and versatile polarization control of X-ray by segmented cross undulator at SPring-8

et al. 2021

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An X-ray is the well-known probe to examine structure of materials, including our own bodies. The X-ray beam, especially at the wavelength of nanometers, has also become significant to directly investigate electronic states of a sample. Such an X-ray is called a soft X-ray and polarization dependence of the light-matter interaction further unveils the microscopic properties, such as orbitals or spins of electrons. Generation of high brilliant beams of the polarized X-ray has linked to development of our experimental science, and it has been made by radiation from relativistic electrons at the synchrotron radiation facilities over the world. Recently, we constructed a new polarization-controlled X-ray source, the segmented cross undulator, at SPring-8, the largest synchrotron radiation facility in the world. The operation is based on interference of X-ray beams, which is sharply contrast to the conventional method of regulating electron trajectory by the mechanical control of magnets. The paradigm shift opened the measurement innovations and allowed us to design new experimental approaches to capture signals that have been hidden in materials. The present review describes the novel X-ray source with the principle of operation and the technical details of optimization. Examples of the frontier spectroscopies that use unique optical properties of the source are introduced, followed by the future prospects for next generation synchrotron radiation facilities.

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A study on the relationship of magnetic moments orientation in L10 FePt network nanostructured film by electron energy-loss magnetic chiral dichroism using semi-core excitation spectra

Makino

Rusz

Wang

et al. 2022

Journal of Magnetism and Magnetic Materials

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Determination of the element-specific complex permittivity using a soft x-ray phase modulator

Cited by 11 publications

References 32 publications

Segmented Undulator for Extensive Polarization Controls in ≤1 nm-rad Emittance Rings

Segmented Undulator for Extensive Polarization Controls in ≤1 nm-rad Emittance Rings

Fast and versatile polarization control of X-ray by segmented cross undulator at SPring-8

A study on the relationship of magnetic moments orientation in L10 FePt network nanostructured film by electron energy-loss magnetic chiral dichroism using semi-core excitation spectra

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