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X-ray detected ferromagnetic resonance spectroscopy for observation of spin and orbital currents
https://repo.qst.go.jp/records/2003232
https://repo.qst.go.jp/records/20032327249fa0c-5dbb-438b-9b91-f4ec927df001
| アイテムタイプ | 会議発表用資料 / Presentation(1) | |||||||
|---|---|---|---|---|---|---|---|---|
| 公開日 | 2026-04-22 | |||||||
| タイトル | ||||||||
| タイトル | X-ray detected ferromagnetic resonance spectroscopy for observation of spin and orbital currents | |||||||
| 言語 | en | |||||||
| 言語 | ||||||||
| 言語 | eng | |||||||
| 資源タイプ | ||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||||
| 資源タイプ | conference presentation | |||||||
| 著者 |
Ueno Tetsuro
× Ueno Tetsuro
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| 抄録 | ||||||||
| 内容記述 | Ferromagnetic resonance (FMR) and X-ray magnetic circular dichroism (XMCD) spectroscopy are powerful techniques for investigating ferromagnetic materials and spintronic devices. X-ray detected ferromagnetic resonance (XFMR) spectroscopy, which combines FMR and XMCD, enables element-selective analysis of spin dynamics in the GHz frequency range [1]. Furthermore, direct observation of AC spin currents in magnetic heterostructures is possible using XFMR spectroscopy by exploiting its element selectivity [2].We have developed an XFMR spectrometer at BL-19B of the Photon Factory (PF), KEK. The spectrometer consists of a UHV chamber with a sample manipulator, a microwave circuit that generates high-order harmonics of the PF master oscillator frequency, and a detection system for X-ray excited optical luminescence (XEOL) from the sample substrate. By tuning the delay between microwave and X-ray pulses, we successfully obtained a sinusoidal XFMR signal, confirming spin precession in permalloy [3].To realize XFMR spectroscopy with high-brilliance soft and tender X-rays, we have also developed another XFMR spectrometer at BL13U of NanoTerasu, a 3 GeV synchrotron radiation facility in Sendai, Japan. This setup is expected to enable time-resolved XMCD measurements. TR-XMCD spectra will be analyzed using machine-learning-based methods to investigate the dynamics of spin and orbital magnetic moments, i.e., spin and orbital currents.This work was supported by the QST President’s Strategic Grant (QST Advanced Study Laboratory), the QST–Tohoku University Matching Research Support Program, JSPS KAKENHI (Grant Nos. JP15K17458 and JP18K13984), the Shimadzu Science Foundation, the Hyogo Science and Technology Association, the Murata Science and Education Foundation, and the Innovative Science and Technology Initiative for Security (Grant No. JPJ004596), ATLA, Japan. XFMR experiments were conducted at the Photon Factory (Proposal Nos. 2018MP001, 2021PF-G020, 2022G072, and 2024G565) and NanoTerasu (Proposal Nos. 2025A9018 and 2025B9007).[1] C. Klewe et al., Synchrotron Radiation News 33, 12 (2020).[2] J. Li et al., Phys. Rev. Lett. 117, 076602 (2016).[3] T. Ueno et al., In preparation. | |||||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||||
| 内容記述 | Conference on Laser and Synchrotron Radiation Combination Experiment 2026 (LSC2026) | |||||||
| 発表年月日 | ||||||||
| 日付 | 2026-04-22 | |||||||
