Ryuji Fujita: Publications

Layer-Dependent Magnetic Domains in Atomically Thin Fe5GeTe2

ACS Nano 16: 7 (2022)

Authors:

Ryuji Fujita, Pedram Bassirian, Zhengxian Li, Yanfeng Guo, Mohamad A. Mawass, Florian Kronast, Gerrit van der Laan, Thorsten Hesjedal

Abstract:

Imaging Nucleation and Propagation of Pinned Domains in Few-Layer Fe5-xGeTe2

ACS Nano 17:17 (2023)

Authors:

Michael Hogen, Ryuji Fujita, Anthony K.C. Tan, Alexandra Geim, Michael Pitts, Zhengxian Li, Lucio Stefan, Thorsten Hesjedal, Mete Atature

Abstract:

Strain-Modulated Ferromagnetism at an Intrinsic van der Waals Heterojunction

Advanced Functional Materials 34: 36 (2024)

Authors:

Ryuji Fujita, Gautam Gurung, Mohamad-Assaad Mawass, Alevtina Smekhova, Florian Kronast, Alexander Kang-Jun Toh, Anjan Soumyanarayanan, Pin Ho, Angadjit Singh, Emily Heppell, Dirk Backes, Francesco Maccherozzi, Kenji Watanabe, Takashi Taniguchi, Daniel A. Mayoh, Geetha Balakrishnan, Gerrit van der Laan, Thorsten Hesjedal

Abstract:

Room-temperature in-plane ferromagnetism in Co-substituted Fe5GeTe2 investigated by magnetic x-ray spectroscopy and microscopy

2D Materials 12:2 (2025)

Authors:

Emily Heppell, Ryuji Fujita, Gautam Gurung, Jheng-Cyuan Lin, Andrew F. May, Michael Foerster, M. Waqas Khaliq, Miguel Angel Nino, Manuel Valvidares, Javier Herrero-Martin, Pierluigi Gargiani, Kenji Watanabe, Takashi Taniguchi, Dirk Backes, Gerrit van der Laan, Thorsten Hesjedal

Abstract:

Room-temperature in-plane ferromagnetism in Co-substituted Fe 5 GeTe 2 investigated by magnetic x-ray spectroscopy and microscopy

2D Materials IOP Publishing 12:2 (2025) 025001

Authors:

Emily Heppell, Ryuji Fujita, Gautam Gurung, Jheng-Cyuan Lin, Andrew F May, Michael Foerster, M Waqas Khaliq, Miguel Angel Niño, Manuel Valvidares, Javier Herrero-Martín, Pierluigi Gargiani, Kenji Watanabe, Takashi Taniguchi, Dirk Backes, Gerrit van der Laan, Thorsten Hesjedal

Abstract:

The exploration of two-dimensional (2D) van der Waals ferromagnets has revealed intriguing magnetic properties with significant potential for spintronics applications. In this study, we examine the magnetic properties of Co-doped Fe5GeTe2 using x-ray photoemission electron microscopy (XPEEM) and x-ray magnetic circular dichroism (XMCD), complemented by density functional theory calculations. Our XPEEM measurements reveal that the Curie temperature ( TC) of a bilayer of (CoxFe 1−x) 5−δGeTe2 (with x = 0.28) reaches ∼300 K—a notable enhancement over most 2D ferromagnets in the ultrathin limit. Interestingly, the TC shows only a small dependence on film thickness (bulk TC≈340 K), in line with the observed in-plane (IP) magnetic anisotropy and robust IP exchange coupling. XMCD measurements indicate that the spin moments for both Fe and Co are significantly reduced compared to the theoretical values. These insights highlight the potential of Co-doped Fe5GeTe2 for stable, high-temperature ferromagnetic applications in 2D materials.

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Ryuji Fujita

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Layer-Dependent Magnetic Domains in Atomically Thin Fe5GeTe2

Authors:

Abstract:

Imaging Nucleation and Propagation of Pinned Domains in Few-Layer Fe5-xGeTe2

Authors:

Abstract:

Strain-Modulated Ferromagnetism at an Intrinsic van der Waals Heterojunction

Authors:

Abstract:

Room-temperature in-plane ferromagnetism in Co-substituted Fe5GeTe2 investigated by magnetic x-ray spectroscopy and microscopy

Authors:

Abstract:

Room-temperature in-plane ferromagnetism in Co-substituted Fe 5 GeTe 2 investigated by magnetic x-ray spectroscopy and microscopy

Authors:

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Ryuji Fujita

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Layer-Dependent Magnetic Domains in Atomically Thin Fe5GeTe2

Authors:

Abstract:

Imaging Nucleation and Propagation of Pinned Domains in Few-Layer Fe5-xGeTe2

Authors:

Abstract:

Strain-Modulated Ferromagnetism at an Intrinsic van der Waals Heterojunction

Authors:

Abstract:

Room-temperature in-plane ferromagnetism in Co-substituted Fe5GeTe2 investigated by magnetic x-ray spectroscopy and microscopy

Authors:

Abstract:

Room-temperature in-plane ferromagnetism in Co-substituted Fe 5 GeTe 2 investigated by magnetic x-ray spectroscopy and microscopy

Authors:

Abstract: