Y. Tokunaga
YOU?
Author Swipe
View article: Dynamic control of ferroic domain patterns by thermal quenching
Dynamic control of ferroic domain patterns by thermal quenching Open
Controlling domain structures in ferroic materials is key to manipulating their functionality. Typically, quasi-static electric or magnetic fields are used to transform ferroic domains. In contrast, metallurgy employs rapid thermal quenche…
View article: Experimental determination of tetramer molecular orbital states in lacunar spinel <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>GaNb</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:math> via hard x-ray photoemission spectroscopy
Experimental determination of tetramer molecular orbital states in lacunar spinel via hard x-ray photoemission spectroscopy Open
In AM4X8 lacunar spinel systems, the formation of structural clusters in Td symmetry has led to the systems and its properties being commonly described by a M4 molecular orbital picture and its associated spin, charge, and orbital degrees …
View article: Piezoelectric Transition in a Nonpyroelectric Gyroidal Metal–Organic Framework
Piezoelectric Transition in a Nonpyroelectric Gyroidal Metal–Organic Framework Open
Among the thirty-two crystallographic point groups, 432 is the only one that lacks an inversion center but does not exhibit piezoelectricity. A gyroidal structure belongs to point group 432 and shows characteristic physical properties attr…
View article: Imaging of a multiferroic domain wall in a non-multiferroic environment
Imaging of a multiferroic domain wall in a non-multiferroic environment Open
View article: Contrasting magnetothermal conductivity in sibling Co-based honeycomb-lattice antiferromagnets
Contrasting magnetothermal conductivity in sibling Co-based honeycomb-lattice antiferromagnets Open
Honeycomb-lattice antiferromagnets have attracted wide attention for\nexploration of exotic heat transport and their interplay with magnetic\nexcitations. In this work, we have revealed a contrasting behavior in the\nmagneto-thermal conduc…
View article: Spin-lattice-coupled helical magnetic order in breathing pyrochlore magnets, CuAlCr$_{4}$S$_{8}$ and CuGaCr$_{4}$S$_{8}$
Spin-lattice-coupled helical magnetic order in breathing pyrochlore magnets, CuAlCr$_{4}$S$_{8}$ and CuGaCr$_{4}$S$_{8}$ Open
We report low-temperature powder X-ray and neutron diffraction studies on breathing pyrochlore magnets Cu$M$Cr$_{4}$S$_{8}$ ($M$ = Al, Ga), which undergo a magnetic transition at $T_{\rm N} \approx$ 21 and 31 K for {$M$ = Al and Ga, respec…
View article: Cluster rearrangement by chiral charge order in lacunar spinel GaNb$_4$Se$_8$
Cluster rearrangement by chiral charge order in lacunar spinel GaNb$_4$Se$_8$ Open
Transition-metal atoms with d electrons sometimes form clusters in crystals, which significantly affects the physical properties. Such a cluster formation frequently accompanies a change in the crystal system, leading to the presence of do…
View article: CSD 2245476: Experimental Crystal Structure Determination
CSD 2245476: Experimental Crystal Structure Determination Open
An entry from the Inorganic Crystal Structure Database, the world’s repository for inorganic crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely availabl…
View article: Real‐Space Observation of Ligand Hole State in Cubic Perovskite SrFeO<sub>3</sub>
Real‐Space Observation of Ligand Hole State in Cubic Perovskite SrFeO<sub>3</sub> Open
An anomalously high valence state sometimes shows up in transition‐metal oxide compounds. In such systems, holes tend to occupy mainly the ligand p orbitals, giving rise to interesting physical properties such as superconductivity in cupra…
View article: Field-induced magnetic structures in the chiral polar antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Ni</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>InSbO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>
Field-induced magnetic structures in the chiral polar antiferromagnet Open
We have performed 115In-NMR spectroscopy for Ni2InSbO6 with corundum-related crystal structure to reveal magnetic structures that develop in high magnetic fields. At low fields Ni2InSbO6 shows a helical magnetic order with a long wavelengt…
View article: Field-induced magnetic structures in the chiral polar antiferromagnet Ni$_2$InSbO$_6$
Field-induced magnetic structures in the chiral polar antiferromagnet Ni$_2$InSbO$_6$ Open
We have performed $^{115}$In-NMR spectroscopy for Ni$_{2}$InSbO$_6$ with corundum-related crystal structure to reveal magnetic structures that develop in high magnetic fields. At low fields Ni$_{2}$InSbO$_6$ shows a helical magnetic order …
View article: Second Harmonic Detection of Antiferromagnetism in MnTiO<sub>3</sub>
Second Harmonic Detection of Antiferromagnetism in MnTiO<sub>3</sub> Open
View article: Breathing pyrochlore magnet CuGaCr$_{4}$S$_{8}$: Magnetic, thermodynamic, and dielectric properties
Breathing pyrochlore magnet CuGaCr$_{4}$S$_{8}$: Magnetic, thermodynamic, and dielectric properties Open
We investigate the crystallographic and magnetic properties of a chromium-based thiospinel CuGaCr$_{4}$S$_{8}$. From a synchrotron x-ray diffraction experiment and structural refinement, Cu and Ga atoms are found to occupy the tetrahedral …
View article: Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets
Double dome structure of the Bose–Einstein condensation in diluted S = 3/2 quantum magnets Open
View article: Real-Space Observation of Ligand Hole State in Cubic Perovskite SrFeO$_3$
Real-Space Observation of Ligand Hole State in Cubic Perovskite SrFeO$_3$ Open
An anomalously high valence state sometimes shows up in transition-metal oxide compounds. In such systems, holes tend to occupy mainly the ligand $p$ orbitals, giving rise to interesting physical properties such as superconductivity in cup…
View article: Magnetoelectrocaloric effect of multiferroic GdFeO3
Magnetoelectrocaloric effect of multiferroic GdFeO3 Open
We report an experimental demonstration of the magnetoelectrocaloric effect (MECE) in multiferroic $\mathrm{GdFeO_3}$. The temperature of the magnetic material changes when an external electric field is suddenly changed. MECE is the larges…
View article: Magnetic structure of the two-dimensional XY antiferromagnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>CoSi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math> studied using single-crystal neutron diffraction
Magnetic structure of the two-dimensional XY antiferromagnet studied using single-crystal neutron diffraction Open
We report a combined polarized and unpolarized neutron diffraction study on a multiferroic Sr2CoSi2O7 (SCSO) single crystal below and above the antiferromagnetic ordering temperature TN = 6.5 K. Unpolarized neutron diffraction measurements…
View article: Spin-lattice and magnetoelectric couplings enhanced by orbital degrees of freedom in polar magnets
Spin-lattice and magnetoelectric couplings enhanced by orbital degrees of freedom in polar magnets Open
Orbital degrees of freedom mediating an interaction between spin and lattice were predicted to raise strong magnetoelectric effect, i.e. realize an efficient coupling between magnetic and ferroelectric orders. However, the effect of orbita…
View article: Magnetic-Field-Induced Antiferromagnetic–Antiferromagnetic Phase Transition in Quasi-Two-Dimensional Multiferroic Material Ba<sub>2</sub>FeSi<sub>2</sub>O<sub>7</sub>
Magnetic-Field-Induced Antiferromagnetic–Antiferromagnetic Phase Transition in Quasi-Two-Dimensional Multiferroic Material Ba<sub>2</sub>FeSi<sub>2</sub>O<sub>7</sub> Open
We investigate the magnetoelectric property of a quasi-two-dimensional magnet Ba2FeSi2O7. An in-plane magnetic field induces a phase transition that is accompanied by only a small magnetization anomaly but apparent electric polarization ch…
View article: Topological thermal Hall effect of magnons in magnetic skyrmion lattice
Topological thermal Hall effect of magnons in magnetic skyrmion lattice Open
Topological transport of fermions is governed by the Chern numbers of the energy bands lying below the Fermi energy. For bosons, e.g., phonons and magnons in a crystal, topological transport is dominated by the Chern number of the lowest e…
View article: Terahertz spectroscopy of spin excitations in magnetoelectric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>LiFePO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math> in high magnetic fields
Terahertz spectroscopy of spin excitations in magnetoelectric in high magnetic fields Open
We investigated the spin excitations of magnetoelectric LiFePO4 by THz absorption spectroscopy in magnetic fields up to 33 T. By studying their selection rules, we found not only magnetic-dipole, but also electric-dipole active (electromag…
View article: Complex magnetic phase diagram with a small phase pocket in a three-dimensional frustrated magnet <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>CuInCr</mml:mi></mml:mrow><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">S</mml:mi></mml:mrow><mml:mn>8</mml:mn></mml:msub></mml:math>
Complex magnetic phase diagram with a small phase pocket in a three-dimensional frustrated magnet Open
Frustrated magnets with a strong spin-lattice coupling can show rich magnetic\nphases and the associated fascinating phenomena. A promising platform is the\nbreathing pyrochlore magnet CuInCr$_{4}$S$_{8}$ with localized $S=3/2$\nCr$^{3+}$ …
View article: Enhancement of giant magnetoelectric effect in Ni-doped <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CaBaCo</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>
Enhancement of giant magnetoelectric effect in Ni-doped Open
The polar magnet CaBaCo$_{4}$O$_{7}$ is known to exhibit the largest\nmagnetic-field-driven electric polarization change ($\\Delta P$) associated with\nan antiferromagnetic (AFM)-ferrimagnetic (FIM) transition in a narrow\ntemperature rang…
View article: <i>In Situ</i> Electric-Field Control of THz Nonreciprocal Directional Dichroism in the Multiferroic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>CoGe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
<i>In Situ</i> Electric-Field Control of THz Nonreciprocal Directional Dichroism in the Multiferroic Open
Nonreciprocal directional dichroism, also called the optical-diode effect, is an appealing functional property inherent to the large class of noncentrosymmetric magnets. However, the in situ electric control of this phenomenon is challengi…
View article: Switching of antiferromagnetic states in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi>LiCoPO</mml:mi></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:math> as investigated via the magnetoelectric effect
Switching of antiferromagnetic states in as investigated via the magnetoelectric effect Open
The linear magnetoelectric (ME) effect allows for the selection or switching\nbetween two antiferromagnetic (AFM) states via the application of large\nelectric ($E$) and magnetic ($H$) fields. Once an AFM state is selected, it is\npreserve…
View article: Author Correction: Vital role of magnetocrystalline anisotropy in cubic chiral skyrmion hosts
Author Correction: Vital role of magnetocrystalline anisotropy in cubic chiral skyrmion hosts Open
View article: Vital role of magnetocrystalline anisotropy in cubic chiral skyrmion hosts
Vital role of magnetocrystalline anisotropy in cubic chiral skyrmion hosts Open
View article: Author response for "Microfluidic rapid quantification of Salmonella enterica serovar Typhimurium collected from chicken meat using immunomagnetic separation after formaldehyde treatment"
Author response for "Microfluidic rapid quantification of Salmonella enterica serovar Typhimurium collected from chicken meat using immunomagnetic separation after formaldehyde treatment" Open
View article: Magnetic Order and Sign of the Dzyaloshinskii–Moriya Interaction in 2-D Antiferromagnet Ba<sub>2</sub>CoGe<sub>2</sub>O<sub>7</sub> Under Applied Magnetic Field
Magnetic Order and Sign of the Dzyaloshinskii–Moriya Interaction in 2-D Antiferromagnet Ba<sub>2</sub>CoGe<sub>2</sub>O<sub>7</sub> Under Applied Magnetic Field Open
International audience
View article: Frustration-driven magnetic fluctuations as the origin of the low-temperature skyrmion phase in Co7Zn7Mn6
Frustration-driven magnetic fluctuations as the origin of the low-temperature skyrmion phase in Co7Zn7Mn6 Open