70 citations · 388 across the 17 of their papers we have counts for
17 papers
Topological surface states induced by the magnetic proximity effect
Soichiro Fukuoka, Le Duc Anh, Masayuki Ishida +4
The combination of magnetism and topological properties in one material platform is attracting significant attention due to the potential of realizing low power consumption and err…
Numerical analysis of voltage-controlled magnetization switching operation in magnetic-topological-insulator-based devices
Takashi Komine, Takahiro Chiba
We theoretically investigate influences of electronic circuit delay, noise and temperature on write-error-rate (WER) in voltage-controlled magnetization switching operation of a ma…
Direct observation of current-induced nonlinear spin torque in Pt-Py bilayers
Toshiyuki Kodama, Nobuaki Kikuchi, Takahiro Chiba +3
We experimentally observe nonlinear spin torque in metallic bilayers of platinum and permalloy by means of spin-torque ferromagnetic-resonance (ST-FMR) under massive dc current inj…
Temperature profile of the Thomson-effect-induced heat release/absorption in junctionless single conductors
Takahiro Chiba, Ryo Iguchi, Takashi Komine +2
The Thomson effect induces heat release or absorption under the simultaneous application of a charge current and a temperature gradient to conductors. Here, we theoretically invest…
Voltage-control of damping constant in magnetic-insulator/topological-insulator bilayers
Takahiro Chiba, Alejandro O. Leon, Takashi Komine
The magnetic damping constant is a critical parameter for magnetization dynamics and the efficiency of memory devices and magnon transport. Therefore, its manipulation by electric…
Elemental topological Dirac semimetal α-Sn with high quantum mobility
Le Duc Anh, Kengo Takase, Takahiro Chiba +3
α-Sn with a diamond-type crystal structure provides an ideal avenue to investigate novel topological properties owing to its rich diagram of topological phases and simple elemental…
Thermoelectric refrigerator based on asymmetric surfaces of a magnetic topological insulator
Takahiro Chiba, Takashi Komine
Thermoelectric (TE) refrigeration such as Peltier cooler enables a unique opportunity in electric energy to directly convert thermal energy. Here, we propose a TE module with both…
Voltage-driven Magnetization Switching via Dirac Magnetic Anisotropy and Spin--orbit Torque in Topological-insulator-based Magnetic Heterostructures
Takahiro Chiba, Takashi Komine
Electric-field control of magnetization dynamics is fundamentally and technologically important for future spintronic devices. Here, based on electric-field control of both magneti…
Giant gate-controlled odd-parity magnetoresistance in one-dimensional channels with a magnetic proximity effect
Kosuke Takiguchi, Le Duc Anh, Takahiro Chiba +3
According to Onsager's principle, electrical resistance of general conductors behaves as an even function of external magnetic field . Only in special circumstances, which i…
Giant gate-controlled proximity magnetoresistance in semiconductor-based ferromagnetic/nonmagnetic bilayers
Kosuke Takiguchi, Le Duc Anh, Takahiro Chiba +3
The evolution of information technology has been driven by the discovery of new forms of large magnetoresistance (MR), such as giant magnetoresistance (GMR) and tunnelling magnetor…
Magnetic-proximity-induced magnetoresistance on topological insulators
Takahiro Chiba, Saburo Takahashi, Gerrit E. W. Bauer
We theoretically study the magnetoresistance (MR) of two-dimensional massless Dirac electrons as found on the surface of three-dimensional topological insulators (3D TIs) that is c…
Electric-Field-Induced Spin Resonance in Antiferromagnetic Insulators: Inverse Process of the Dynamical Chiral Magnetic Effect
Akihiko Sekine, Takahiro Chiba
We propose a realization of the electric-field-induced antiferromagnetic resonance. We consider three-dimensional antiferromagnetic insulators with spin-orbit coupling characterize…
Magnetization damping in noncollinear spin valves with antiferromagnetic interlayer couplings
Takahiro Chiba, Gerrit E. W. Bauer, Saburo Takahashi
We study the magnetic damping in the simplest of synthetic antiferromagnets, i.e. antiferromagnetically exchange-coupled spin valves in which applied magnetic fields tune the magne…
Current-induced spin torque resonance of a magnetic insulator
Michael Schreier, Takahiro Chiba, Arthur Niedermayr +7
Pure spin currents transport angular momentum without an associated charge flow. This unique property makes them attractive for spintronics applications, such as torque induced mag…
Current-induced spin torque resonance of magnetic insulators affected by field-like spin-orbit torques and out-of-plane magnetizations
Takahiro Chiba, Michael Schreier, Gerrit E. W. Bauer +1
The spin-torque ferromagnetic resonance (ST-FMR) in a bilayer system consisting of a magnetic insulator such as Y3Fe5O12 and a normal metal with spin-orbit interaction such as Pt i…
Current-induced spin torque resonance of magnetic insulators
Takahiro Chiba, Gerrit E. W. Bauer, Saburo Takahashi
We formulate a theory of the AC spin Hall magnetoresistance (SMR) in a bilayer system consisting of a magnetic insulator such as yttrium iron garnet (YIG) and a heavy metal such as…
Spin torque transistor revisited
Takahiro Chiba, Gerrit E. W. Bauer, Saburo Takahashi
This paper reports on the improvement of the differential current gain in the spin-torque transistor based on two independent innovations, viz.the use of magnetic insulators and th…