61 citations · 191 across the 21 of their papers we have counts for
21 papers
Tunable competing optical excitation pathways in the topological surface states of BiTe
Shin Yokoyama, Takahito Takeda, Nagi Suzuki +9
Understanding coherent optical responses of topological surface states (TSSs) requires disentangling excitation pathways from the electronic band structure. Here, using angle-resol…
Intrinsic low-spin state and strain-tunable anomalous Hall scaling in high-quality SrRuO3 (111) films
Harunori Shiratani, Yuki K. Wakabayashi, Yoshiharu Krockenberger +6
The (111)-oriented 4d ferromagnetic perovskite SrRuO3 (SRO) offers a unique triangular-lattice geometry, making it a promising platform for exploring Berry-curvature-driven and spi…
Epitaxial lift-off of LaSrMnO membranes enabled by BaO sacrificial layers and restoration of the Curie temperature
Takahito Takeda, Daigo Matsubara, Yuki K. Wakabayashi +7
Ultrathin complex-oxide membranes provide a powerful platform for strain engineering, interfacial control, and heterogeneous integration; however, their formation remains constrain…
Magnetic anisotropy related to hybridization between Fe 3 and As 4 orbitals in a bcc Fe-As thin film
Takahito Takeda, Karumuri Sriharsha, Seiji Aota +9
The magnetic anisotropy (MA) of Fe-based ferromagnetic thin films has been extensively studied for device applications. The examined material is a new Fe-based ferromagnetic thin f…
Single monolayer ferromagnetic perovskite SrRuO3 with high conductivity and strong ferromagnetism
Yuki K. Wakabayashi, Masaki Kobayashi, Yoshiharu Krockenberger +4
Achieving robust ferromagnetism and high conductivity in atomically thin oxide materials is critical for advancing spintronic technologies. Here, we report the growth of a highly c…
Giant memory function based on the magnetic field history of resistive switching under a constant bias voltage
Masaya Kaneda, Shun Tsuruoka, Hikari Shinya +8
Memristors, which are characterized by their unique input-voltage-history-dependent resistance, have garnered significant attention for the exploration of next-generation in-memory…
Correlated Ligand Electrons in the Transition-Metal Oxide SrRuO
Yuichi Seki, Yuki K. Wakabayashi, Takahito Takeda +9
In transition-metal compounds, the transition-metal d electrons play an important role in their physical properties; however, the effects of the electron correlation between the li…
SrRuO3 under tensile strain: Thickness-dependent electronic and magnetic properties
Yuki K. Wakabayashi, Masaki Kobayashi, Yuichi Seki +6
The burgeoning fields of spintronics and topological electronics require materials possessing a unique combination of properties: ferromagnetism, metallicity, and chemical stabilit…
Mechanism of ferromagnetism enhancement in a La Sr MnO membrane released from epitaxial strain
Takahito Takeda, Takuma Arai, Kohei Yamagami +4
Recent studies have shown that the magnetic properties of the ferromagnetic perovskite oxide La Sr MnO (LSMO) grown on an SrTiO3 (STO) substrate, such as its ma…
Identification of electronic dimensionality reduction in semiconductor quantum well structures
Takahito Takeda, Kengo Takase, Vladimir N. Strocov +2
Two-dimensional (2D) systems, such as high-temperature superconductors, surface states of topological insulators, and layered materials, have been intensively studied using vacuum-…
Allotropic transition of Dirac semimetal α-Sn to superconductor β-Sn induced by irradiation of focused ion beam
Kohdai Inagaki, Keita Ishihara, Tomoki Hotta +9
Diamond-type structure allotrope α-Sn is attracting much attention as a topological Dirac semimetal (TDS). In this study, we demonstrate that α-Sn undergoes a phase transition to a…
Imaging emergent exotic quasiparticle state in a frustrated transition metal oxide
Yuita Fujisawa, Anjana Krishnadas, Chia-Hsiu Hsu +10
The existence of rich Fermiology in anomalous metal phase in exotic superconductors has attracted considerable interests, as exemplified in copper, iron-based, and intermetallic fr…
Isotropic orbital magnetic moments in magnetically anisotropic SrRuO3 films
Yuki K. Wakabayashi, Masaki Kobayashi, Yukiharu Takeda +6
Epitaxially strained SrRuO3 films have been a model system for understanding the magnetic anisotropy in metallic oxides. In this paper, we investigate the anisotropy of the Ru 4d a…
Ferromagnetism induced by hybridization of Fe 3d orbitals with ligand InSb bands in n-type ferromagnetic semiconductor (In,Fe)Sb
Ryo Okano, Tomoki Hotta, Takahito Takeda +8
Fe-doped III-V ferromagnetic semiconductor (FMS) (In,Fe)Sb is a promising material for spintronic device applications because of the n-type carrier conduction and the ferromagnetis…
Magnetic anisotropy of the van der Waals ferromagnet CrGeTe studied by angular-dependent XMCD
M. Suzuki, B. Gao, G. Shibata +12
The van der Waals ferromagnet CrGeTe (CGT) has a two-dimensional crystal structure where each layer is stacked through van der Waals force. We have investigated the nat…
Development of magnetism in Fe-doped magnetic semiconductors: Resonant photoemission and x-ray magnetic circular dichroism studies of (Ga,Fe)As
Takahito Takeda, Shoya Sakamoto, Le Duc Anh +8
Fe-doped III-V ferromagnetic semiconductors (FMSs) such as (In,Fe)As, (Ga,Fe)Sb, (In,Fe)Sb, and (Al,Fe)Sb are promising materials for spintronic device applications because of the…
Single-domain perpendicular magnetization induced by the coherent O 2p-Ru 4d hybridized state in an ultra-high-quality SrRuO3 film
Yuki K. Wakabayashi, Masaki Kobayashi, Yukiharu Takeda +8
We investigated the Ru 4d and O 2p electronic structure and magnetic properties of an ultra-high-quality SrRuO3 film on SrTiO3 grown by machine-learning-assisted molecular beam epi…
Itinerant ferromagnetism mediated by giant spin polarization of metallic ligand band in van der Waals magnet Fe5GeTe2
K. Yamagami, Y. Fujisawa, B. Driesen +15
We investigate near-Fermi-energy (EF) element-specific electronic and spin states of ferromagnetic van der Waals (vdW) metal Fe5GeTe2. The soft x-ray angle-resolved photoemission s…
Evolution of the Fe-3 impurity band state as the origin of high Curie temperature in p-type ferromagnetic semiconductor (Ga,Fe)Sb
Takahito Takeda, Shoya Sakamoto, Kohsei Araki +8
(Ga,Fe)Sb is one of the promising ferromagnetic semiconductors for spintronic device applications because its Curie temperature () is above 300 K when the Fe…
Tailoring Magnetism in Self-intercalated Cr1+δTe2 Epitaxial Films
Y. Fujisawa, M. Pardo-Almanza, J. Garland +13
Magnetic transition metal dichalcogenide (TMD) films have recently emerged as promising candidates to host novel magnetic phases relevant to next-generation spintronic devices. How…
Hybridization between the ligand band and Fe-3 orbitals in the p-type ferromagnetic semiconductor (Ga,Fe)Sb
Takahito Takeda, Masahiro Suzuki, Le Duc Anh +13
(Ga,Fe)Sb is a promising ferromagnetic semiconductor for practical spintronic device applications because its Curie temperature () is above room temperature. However, th…