224 citations · 1.1k across the 32 of their papers we have counts for
32 papers
Impact of epitaxial strain relaxation on ferromagnetism in a freestanding La2/3Sr1/3MnO3 membrane
Ryuji Atsumi, Junichi Shiogai, Takumi Yamazaki +3
Manganite perovskites host emerging physical properties of strongly-correlated electrons with charge, spin, and lattice degrees of freedom. Using epitaxial lift-off technique, we r…
Lattice constants and magnetism of L10-ordered FePt under high pressure
S. Sawada, K. Okai, H. Fukui +10
We studied the relationship between the lattice constant and magnetism of L10-ordered FePt under high pressure by means of first-principles calculations and synchrotron x-ray measu…
Chirality-dependent spin current generation in a helimagnet: zero-field probe of chirality
Hidetoshi Masuda, Takeshi Seki, Jun-ichiro Ohe +3
In a magnetic texture, the spin of a conduction electron is forced to be aligned to the localized moment. As a result, the topology of the magnetic texture affects the electron dyn…
Enhancement of Spin-Charge Conversion Efficiency for CoSnS across Transition from Paramagnetic to Ferromagnetic Phase
Takeshi Seki, Yong-Chang Lau, Junya Ikeda +5
CoSnS (CSS) is one of the shandite compounds and becomes a magnetic Weyl semimetal candidate below the ferromagnetic phase transition temperature ($\textit{T}_\te…
Room-temperature chirality switching in a helimagnetic thin film
Hidetoshi Masuda, Takeshi Seki, Yoichi Nii +3
Helimagnetic structures, in which the magnetic moments are spirally ordered, host an internal degree of freedom called chirality (or helicity) corresponding to the handedness of th…
Intercorrelated anomalous Hall and spin Hall effect in kagome-lattice CoSnS-based shandite films
Yong-Chang Lau, Junya Ikeda, Kohei Fujiwara +5
Magnetic Weyl semimetals (mWSMs) are characterized by linearly dispersive bands with chiral Weyl node pairs associated with broken time reversal symmetry. One of the hallmarks of m…
Sm-Co-based amorphous alloy films for zero-field operation of transverse thermoelectric generation
Rajkumar Modak, Yuya Sakuraba, Takamasa Hirai +8
Transverse thermoelectric generation using magnetic materials is essential to develop active thermal engineering technologies, for which the improvements of not only the thermoelec…
Highly fcc-textured Pt-Al alloy films grown on MgO(001) showing enhanced spin Hall efficiency
Yong-Chang Lau, Takeshi Seki, Koki Takanashi
We report on a systematic comparative study of the spin Hall efficiency between highly face-centered cubic (fcc)-textured Pt-Al alloy films grown on MgO(001) and poorly-crystallize…
Spin Hall effect in a spin-1 chiral semimetal
Ke Tang, Yong-Chang Lau, Kenji Nawa +7
Spin-1 chiral semimetal is a new state of quantum matter hosting unconventional chiral fermions that extend beyond the common Dirac and Weyl fermions. B20-type CoSi is a prototypal…
Two-dimensionality of metallic surface conduction in Co3Sn2S2 thin films
Junya Ikeda, Kohei Fujiwara, Junichi Shiogai +4
Two-dimensional (2D) surface of the topological materials is an attractive channel for the electrical conduction reflecting the linearly-dispersive electronic bands. By applying a…
Magnetization switching induced by spin-orbit torque from Co2MnGa magnetic Weyl semimetal thin films
Ke Tang, Zhenchao Wen, Yong-Chang Lau +3
This study reports the magnetization switching induced by spin-orbit torque (SOT) from the spin current generated in Co2MnGa magnetic Weyl semimetal (WSM) thin films. We deposited…
High-temperature dependence of anomalous Ettingshausen effect in SmCo-type permanent magnets
Asuka Miura, Keisuke Masuda, Takamasa Hirai +6
The anomalous Ettingshausen effect (AEE) in SmCo-type permanent magnets has been investigated in the high-temperature range from room temperature to around 600 K. The anomalous…
Interlayer exchange coupling through Ir-doped Cu spin Hall material
Hiroto Masuda, Takeshi Seki, Yong-Chang Lau +2
Metallic superlattices where the magnetization vectors in the adjacent ferromagnetic layers are antiferromagnetically coupled by the interlayer exchange coupling through nonmagneti…
Perpendicularly Magnetized Ni / Pt (001) Epitaxial Superlattice
T. Seki, M. Tsujikawa, K. Ito +4
A perpendicularly magnetized ferromagnetic layer is an important building block for recent/future highdensity spintronic memory applications. This paper reports on the fabrication…
Fermi Level Controlled Ultrafast Demagnetization Mechanism in Half-Metallic Heusler Alloy
Santanu Pan, Takeshi Seki, Koki Takanashi +1
The electronic band structure-controlled ultrafast demagnetization mechanism in Co2FexMn1-xSi Heusler alloy is underpinned by systematic variation of composition. We find the spin-…
Spin-mediated charge-to-heat current conversion phenomena in ferromagnetic binary alloys
Asuka Miura, Ryo Iguchi, Takeshi Seki +2
Spin-mediated charge-to-heat current conversion phenomena, i.e., the anomalous Ettingshausen effect (AEE) and the anisotropic magneto-Peltier effect (AMPE), have been investigated…
High spin mixing conductance and spin interface transparency at Heusler alloy and Pt interface
Braj Bhusan Singh, Koustuv Roy, Pushpendra Gupta +3
Ferromagnetic materials exhibiting low magnetic damping () and moderately high saturation magnetization are required from the viewpoints of generation, transmission and detectio…
Element-selective tracking ultrafast demagnetization process in Co/Pt multilayer thin films by the resonant magneto-optical Kerr effect
Kohei Yamamoto, Souliman El Moussaoui, Yasuyuki Hirata +8
We examined the photo-induced dynamics of ferromagnetic Co/Pt thin films demonstrating perpendicular magnetic anisotropy with element specificity using resonant polar magneto-optic…
Tunability of domain structure and magnonic spectra in antidot arrays of Heusler alloy
Sougata Mallick, Sucheta Mondal, Takeshi Seki +8
Materials suitable for magnonic crystals demand low magnetic damping and long spin wave (SW) propagation distance. In this context Co based Heusler compounds are ideal candidates f…
Large Spin Anomalous Hall Effect in L1-FePt: Symmetry and Magnetization Switching
Takeshi Seki, Satoshi Iihama, Tomohiro Taniguchi +1
We quantitatively evaluate a spin anomalous Hall effect (SAHE), generating spin angular momentum flow (spin current, ), in an L1-FePt ferromagnet by exploiting…
Fe-Sn nanocrystalline films for flexible magnetic sensors with high thermal stability
Y. Satake, K. Fujiwara, J. Shiogai +2
The interplay of magnetism and spin-orbit coupling on an Fe kagome lattice in Fe3Sn2 crystal produces a unique band structure leading to an order of magnitude larger anomalous Hall…
Spin-charge conversion in NiMnSb Heusler alloy films
Zhenchao Wen, Zhiyong Qiu, Sebastian Tolle +7
Half-metallic Heusler alloys are attracting considerable attention because of their unique half-metallic band structures which exhibit high spin polarization and yield huge magneto…
Ultrafast demagnetization of Pt magnetic moment in L1-FePt probed by hard x-ray free electron laser
Kohei Yamamoto, Yuya Kubota, Motohiro Suzuki +15
We demonstrate ultrafast magnetization dynamics in a 5d transition metal using circularly-polarized x-ray free electron laser in the hard x-ray region. A decay time of light-induce…
Spin-Hall and Anisotropic Magnetoresistance in Ferrimagnetic Co-Gd / Pt layers
W. Zhou, T. Seki, T. Kubota +2
We present the Co-Gd composition dependence of the spin-Hall magnetoresistance (SMR) and anisotropic magnetoresistance (AMR) for ferrimagnetic Co100-xGdx / Pt bilayers. With Gd con…