684 citations · 3.2k across the 51 of their papers we have counts for
16 papers · 1 filter
Observation of charge-to-spin conversion with giant efficiency at NiFe/BiWO interface
Saikat Das, Satoshi Sugimoto, Varun Kumar Kushwaha +2
Magnetization switching using spin-orbit torque offers a promising route to developing non-volatile memory technologies. The prerequisite, however, is the charge-to-spin current co…
Deterministic influence of substrate-induced oxygen vacancy diffusion on thin film growth
Saikat Das, Tadakatsu Ohkubo, Shinya Kasai +1
In oxide epitaxy, the growth temperature and background oxygen partial pressure are considered as the most critical factors that control the phase stability of an oxide thin film.…
Gate-tuned quantum Hall states in Dirac semimetal (Cd1-xZnx)3As2
Shinichi Nishihaya, Masaki Uchida, Yusuke Nakazawa +4
The recent discovery of topological Dirac semimetals (DSM) has provoked intense curiosity not only on Weyl physics in solids, but also on topological phase transitions originating…
Structural characterisation of high-mobility Cd3As2 films crystallised on SrTiO3
Yusuke Nakazawa, Masaki Uchida, Shinichi Nishihaya +4
Cd3As2 has long been known as a high-mobility semiconductor. The recent finding of a topological semimetal state in this compound has demanded growth of epitaxial films with high c…
Quantum Hall states observed in thin films of Dirac semimetal Cd3As2
Masaki Uchida, Yusuke Nakazawa, Shinichi Nishihaya +9
A well known semiconductor Cd3As2 has reentered the spotlight due to its unique electronic structure and quantum transport phenomena as a topological Dirac semimetal. For elucidati…
Evolution of Insulator-Metal Phase Transitions in Epitaxial Tungsten Oxide Films during Electrolyte-Gating
Shinichi Nishihaya, Masaki Uchida, Yusuke Kozuka +2
An interface between an oxide and an electrolyte gives rise to various processes as exemplified by electrostatic charge accumulation/depletion and electrochemical reactions such as…
All-in-all-out magnetic domain wall conduction in pyrochlore iridate heterointerface
T. C. Fujita, M. Uchida, Y. Kozuka +4
Pyrochlore oxides possessing "all-in-all-out" spin ordering have attracted burgeoning interest as a rich ground of emergent states. This ordering has two distinct types of magnetic…
Effective Carrier Doping and Metallization in LaxSr2-x-yBayIrO4-delta Thin Films
M. Ito, M. Uchida, Y. Kozuka +2
We fabricate LaxSr2-x-yBayIrO4-delta thin films by pulsed laser deposition, in an effort to realize the effective carrier doping and metallization in the Sr2IrO4 system. We design…
All-in-all-out magnetic domain size in pyrochlore iridate thin films as probed by local magnetotransport
T. C. Fujita, M. Uchida, Y. Kozuka +4
Pyrochlore iridates have attracted growing attention because of a theoretical prediction of a possible topological semimetal phase originating from all-in-all-out spin ordering. Re…
Odd-parity magnetoresistance in pyrochlore iridate thin films with broken time-reversal symmetry
T. C. Fujita, Y. Kozuka, M. Uchida +3
A new class of materials termed topological insulators have been intensively investigated due to their unique Dirac surface state carrying dissipationless edge spin currents. Recen…
Field-direction control of the type of charge carriers in nonsymmorphic IrO2
M. Uchida, W. Sano, K. S. Takahashi +5
In the quest for switching of the charge carrier type in conductive materials, we focus on nonsymmorphic crystals, which are expected to have highly anisotropic folded Fermi surfac…
Quantum Hall Effect on Top and Bottom Surface States of Topological Insulator (Bi1-xSbx)2Te3 Films
R. Yoshimi, A. Tsukazaki, Y. Kozuka +6
The three-dimensional (3D) topological insulator (TI) is a novel state of matter as characterized by two-dimensional (2D) metallic Dirac states on its surface. Bi-based chalcogenid…
Challenges and opportunities of ZnO-related single crystalline heterostructures
Y. Kozuka, A. Tsukazaki, M. Kawasaki
Recent technological advancement in ZnO heterostructures has expanded the possibility of device functionalities to various kinds of applications. In order to extract novel device f…
Epitaxially Stabilized EuMoO3: A New Itinerant Ferromagnet
Yusuke Kozuka, Hidenobu Seki, Takahiro C. Fujita +7
Synthesizing metastable phase often opens new functions in materials but is a challenging topic. Thin film techniques have advantages to form materials which do not exist in nature…
Precise calibration of Mg concentration in MgxZn1-xO thin films grown on ZnO substrates
Y. Kozuka, J. Falson, Y. Segawa +3
The growth techniques for MgxZn1-xO thin films have advanced at a rapid pace in recent years, enabling the application of this material to a wide range of optical and electrical ap…
Ultrafast optical control of magnetization in EuO thin films
T. Makino, F. Liu, T. Yamasaki +6
All-optical pump-probe detection of magnetization precession has been performed for ferromagnetic EuO thin films at 10 K. We demonstrate that the circularly-polarized light can be…