978 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Kyoto UniversityJP223 papers
- The University of TokyoJP53 papers
- The University of OsakaJP48 papers
- Kyoto Bunkyo UniversityJP45 papers
- Tohoku UniversityJP29 papers
- Japan Science and Technology AgencyJP26 papers
- Brookhaven National LaboratoryUS19 papers
- High Energy Accelerator Research OrganizationJP18 papers
- National Institute of Advanced Industrial Science and TechnologyJP18 papers
- Spintronics Research Network of JapanJP16 papers
- Korea Advanced Institute of Science and TechnologyKR13 papers
- Tokyo Institute of TechnologyJP13 papers
33 papers · 1 filter
Probing thermal magnon current mediated by coherent magnon via nitrogen-vacancy centers in diamond
Dwi Prananto, Yuta Kainuma, Kunitaka Hayashi +3
Currently, thermally excited magnons are being intensively investigated owing to their potential in computing devices and thermoelectric conversion technologies. We report the dete…
Prediction of topological Hall effect in a driven magnetic domain wall
Kab-Jin Kim, Masahito Mochizuki, Teruo Ono
We investigate the possible emergence of topological Hall effect (THE) in a driven magnetic DW. Numerical simulation based on the Landau-Lifshitz-Gilbert-Slonczewski (LLGS) equatio…
Vanishing skyrmion Hall effect at the angular momentum compensation temperature of a ferrimagnet
Yuushou Hirata, Duck-Ho Kim, Se Kwon Kim +14
Charged particles exhibit the Hall effect in the presence of magnetic fields. Analogously, ferromagnetic skyrmions with non-zero topological charges and finite fictitious magnetic…
Room Temperature Electrically Detected Nuclear Spin Coherence of NV Centers in Diamond
Hiroki Morishita, Satoshi Kobayashi, Masanori Fujiwara +4
We demonstrate electrical detection of the N nuclear spin coherence of NV centers at room temperature. Nuclear spins are candidates for quantum memories in quantum-informati…
Microscopic origin of electric-field-induced modulation of Curie temperature in cobalt
Fuyuki Ando, Kihiro T. Yamada, Tomohiro Koyama +5
The Curie temperature is one of the most fundamental physical properties of ferromagnetic materials and can be described by Weiss molecular field theory with the exchange interacti…
Transport Coefficients of Dirac Ferromagnet: Effects of Vertex Corrections
Junji Fujimoto
As a strongly spin-orbit coupled metallic model with ferromagnetism, we have considered an extended Stoner model to the relativistic regime, named Dirac ferromagnet in three dimens…
Electric field-induced creation and directional motion of domain walls and skyrmion bubbles
Chuang Ma, Xichao Zhang, Jing Xia +7
Magnetization dynamics driven by an electric field could provide long-term benefits to information technologies because of its ultralow power consumption. Meanwhile, the Dzyaloshin…
Intrinsic and Extrinsic Spin Hall Effects of Dirac Electrons
Takaaki Fukazawa, Hiroshi Kohno, Junji Fujimoto
We investigate the spin Hall effect (SHE) of electrons described by the Dirac equation, which is used as an effective model near the -points in bismuth. By considering short-ran…
Finite shot noise and electron heating at quantized conductance in high-mobility quantum point contacts
Tatsuya Muro, Yoshitaka Nishihara, Shota Norimoto +8
We report a precise experimental study on the shot noise of a quantum point contact (QPC) fabricated in a GaAs/AlGaAs based high-mobility two-dimensional electron gas (2DEG). The c…
Snell's Law for Spin Waves
Johannes Stigloher, Martin Decker, Helmut S. Körner +9
We report the experimental observation of Snell's law for magneto-static spin waves in thin ferromagnetic Permalloy films by imaging incident, refracted and reflected waves. We use…
Anomalous behavior of 1/f noise in graphene near the charge neutrality point
Shunpei Takeshita, Sadashige Matsuo, Takahiro Tanaka +6
We investigate the noise in single layer graphene devices from equilibrium to far from equilibrium and found that the 1/f noise shows an anomalous dependence on the source-drain bi…
Radio-frequency capacitance spectroscopy of metallic nanoparticles
J. C. Frake, S. Kano, C. Ciccarelli +6
Recent years have seen great progress in our understanding of the electronic properties of nanomaterials in which at least one dimension measures less than 100 nm. However, contact…
Shot Noise Induced by Nonequilibrium Spin Accumulation
Tomonori Arakawa, Junichi Shiogai, Mariusz Ciorga +8
When an electric current passes across a potential barrier, the partition process of electrons at the barrier gives rise to the shot noise, reflecting the discrete nature of the el…
Experimental Proof of Universal Conductance Fluctuation in Quasi-1D Epitaxial BiSe Wires
Sadashige Matsuo, Kensaku Chida, Daichi Chiba +8
We report on conductance fluctuation in quasi-one-dimensional wires made of epitaxial BiSe thin film. We found that this type of fluctuation decreases as the wire lengt…
Low-frequency and shot noises in CoFeB/MgO/CoFeB magnetic tunneling junctions
Tomonori Arakawa, Takahiro Tanaka, Kensaku Chida +7
The low-frequency and shot noises in spin-valve CoFeB/MgO/CoFeB magnetic tunneling junctions were studied at low temperature. The measured 1/f noise around the magnetic hysteresis…
Observation of finite excess noise in the voltage-biased quantum Hall regime as a precursor for breakdown
Kensaku Chida, Tomonori Arakawa, Sadashige Matsuo +7
We performed noise measurements in a two-dimensional electron gas to investigate the nonequilibrium quantum Hall effect (QHE) state. While excess noise is perfectly suppressed arou…
Spin-Polarized Ground States and Ferromagnetic Order Induced by Low-Coordinated Surface Atoms and Defects in Nanoscale Magnesium Oxide
Takashi Uchino, Toshinobu Yoko
We investigate the effect of low-coordinated surface atoms on the defect-induced magnetism in MgO nanocrystallites using hybrid density functional theory calculations. It has been…
Signature of Coherent Transport in Epitaxial Spinel-based Magnetic Tunnel Junctions Probed by Shot Noise Measurement
Takahiro Tanaka, Tomonori Arakawa, Kensaku Chida +7
We measured the shot noise in fully epitaxial Fe/MgAl2OX/Fe-based magnetic tunneling junctions (MTJs). While the Fano factor to characterize the shot noise is very close to unity i…
Shot noise suppression in InGaAs/InGaAsP quantum channels
Yoshitaka Nishihara, Shuji Nakamura, Kensuke Kobayashi +3
We have measured the shot noise in a quantum point contact (QPC) fabricated by using InGaAs/InGaAsP heterostructure, whose conductance can be electrically tuned by the gate voltage…
Weak Antilocalization and Conductance Fluctuation in a Sub-micrometer-sized Wire of Epitaxial Bi2Se3
Sadashige Matsuo, Tomohiro Koyama, Kazutoshi Shimamura +9
In this study, we address the phase coherent transport in a sub-micrometer-sized Hall bar made of epitaxial Bi2Se3 thin film by probing the weak antilocalization (WAL) and the magn…
Work fluctuation theorem for a classical circuit coupled to a quantum conductor
Y. Utsumi, D. S. Golubev, M. Marthaler +2
We propose a setup for a quantitative test of the quantum fluctuation theorem. It consists of a quantum conductor, driven by an external voltage source, and a classical inductor-ca…
Shot Noise Induced by Electron-nuclear Spin-flip Scattering in a Nonequilibrium Quantum Wire
Kensaku Chida, Masayuki Hashisaka, Yoshiaki Yamauchi +5
We study the shot noise (nonequilibrium current fluctuation) associated with dynamic nuclear polarization in a nonequilibrium quantum wire (QW) fabricated in a two-dimensional elec…
Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions
Tomonori Arakawa, Koji Sekiguchi, Shuji Nakamura +7
We measured the shot noise in the CoFeB/MgO/CoFeB-based magnetic tunneling junctions with a high tunneling magnetoresistance ratio (over 200% at 3 K). Although the Fano factor in t…
Symmetry and Nonstoichiometry as Possible Origin of Ferromagnetism in Nanoscale oxides
Takashi Uchino, Toshinobu Yoko
We show through density functional theory calculations that extended magnetic states can inherently occur in oxides as the size of the crystals is reduced down to the nanometer sca…