163 citations · 344 across the 17 of their papers we have counts for
17 papers
Generation of third-harmonic spin oscillation from strong spin precession induced by terahertz magnetic near fields
Zhenya Zhang, Fumiya Sekiguchi, Takahiro Moriyama +9
The ability to drive a spin system to state far from the equilibrium is indispensable for investigating spin structures of antiferromagnets and their functional nonlinearities for…
Effect of Non-stoichiometry on Magnetocaloric Properties of HoB2 Gas-Atomized Particles
Takafumi D. Yamamoto, Takeya Hiroyuki, Pedro Baptista de Castro +4
We fabricate gas-atomized particles by inductively melting electrode rods of HoB2-x (x = -0.3, 0, 0.3, and 1.0) and investigate the effect of non-stoichiometry on the phase fractio…
Magnetocaloric particles of the Laves phase compound HoAl2 prepared by electrode induction melting gas atomization
Takafumi D. Yamamoto, Hiroyuki Takeya, Akiko T. Saito +3
Processing magnetocaloric materials into magnetic refrigerant particles is an essential issue in developing high-performance magnetic refrigerators. Here, we succeed in stably prod…
Gas-atomized particles of giant magnetocaloric compound HoB2 for magnetic hydrogen liquefiers
Takafumi D. Yamamoto, Hiroyuki Takeya, Akiko T. Saito +4
The processing of promising magnetocaloric materials into spheres is one of the important issues on developing high-performance magnetic refrigeration systems. In the present study…
High-pressure synthesis of superconducting SnS using diamond anvil cell with boron-doped diamond heater
Ryo Matsumoto, Kensei Terashima, Satoshi Nakano +8
High-pressure techniques open exploration of functional materials in broad research fields. An established diamond anvil cell with a boron-doped diamond heater and transport measur…
Enhancement of giant refrigerant capacity in HoGdB alloys (0.1 x 0.4)
Pedro Baptista de Castro, Kensei Terashima, Takafumi D Yamamoto +8
Intending to optimize the giant magnetocaloric properties of HoB, we synthesized and magnetocalorically characterized HoGdB(0.1 x 0.4) alloy…
Effect of Dy substitution in the giant magnetocaloric properties of HoB
Pedro Baptista de Castro, Kensei Terashima, Takafumi D. Yamamoto +6
Recently, a massive magnetocaloric effect near the liquefaction temperature of hydrogen has been reported in the ferromagnetic material HoB. Here we investigate the effects o…
Machine Learning Guided Discovery of Gigantic Magnetocaloric Effect in HoB Near Hydrogen Liquefaction Temperature
Pedro Baptista de Castro, Kensei Terashima, Takafumi D Yamamoto +8
Magnetic refrigeration exploits the magnetocaloric effect which is the entropy change upon application and removal of magnetic fields in materials, providing an alternate path for…
Demonstration of Electric Double Layer Gating under High Pressure by the Development of Field-Effect Diamond Anvil Cell
Shintaro Adachi, Ryo Matsumoto, Sayaka Yamamoto +9
We have developed an approach to control the carrier density in various material under high pressure by the combination of an electric double layer transistor (EDLT) with a diamond…
Magnetic entropy change of ErAl2 magnetocaloric wires fabricated by a powder-in-tube method
Takafumi D. Yamamoto, Hiroyuki Takeya, Suguru Iwasaki +4
We report the fabrication of ErAl2 magnetocaloric wires by a powder-in-tube method (PIT) and the evaluation of magnetic entropy change through magnetization measurements. The magne…
Dynamical coupling of dilute magnetic impurities with quantum spin liquid state in the S = 3/2 dimer compound Ba3ZnRu2O9
Takafumi D. Yamamoto, Hiroki Taniguchi, Ichiro Terasaki
We have investigated the dilute magnetic impurity effect on the magnetic properties of a quantum spin liquid candidate Ba3ZnRu2O9 and a spin gapped compound Ba3CaRu2O9. The magneti…
Magneto-thermopower in the Weak Ferromagnetic Oxide CaRu0.8Sc0.2O3: An Experimental Test for the Kelvin Formula in a Magnetic Material
Takafumi D. Yamamoto, Hiroki Taniguchi, Yukio Yasui +3
We have measured the resistivity, the thermopower, and the specific heat of the weak ferromagnetic oxide CaRu0.8Sc0.2O3 in external magnetic fields up to 140 kOe below 80 K. We hav…
Cubic lead perovskite PbMoO3 with anomalous metallic behavior
Hiroshi Takatsu, Olivier Hernandez, Wataru Yoshimune +9
A previously unreported Pb-based perovskite PbMoO is obtained by high-pressure and high-temperature synthesis. This material crystallizes in the cubic structure at…
Ferromagnetic Cluster Glass Phase Embedded in a Paramagnetic and Metallic Host in Non-uniform Magnetic System CaRu_{1-x}Sc_{x}O_{3}
Takafumi D. Yamamoto, Atsuhiro Kotani, Hiroshi Nakajima +4
We have investigated both static and dynamic magnetic properties of polycrystalline CaRuScO system in order to clarify the role of Sc ions as a disorder for mag…
Non-uniform magnetic system driven by non-magnetic ion substitution in CaRu1-xScxO3:Two-component analysis
Takafumi D. Yamamoto, Ryuji Okazaki, Hiroki Taniguchi +1
We have studied magnetic and transport properties in polycrystalline CaRu1-xScxO3 for 0 =< x =< 0.20 in order to clarify the substitution effects of a non-magnetic trivalent ion. W…
Resonant Spin Wave Excitation by Terahertz Magnetic Near-field Enhanced with Split Ring Resonator
Y. Mukai, H. Hirori, T. Yamamoto +2
Excitation of antiferromagnetic spin waves in HoFeO crystal combined with a split ring resonator (SRR) is studied using terahertz (THz) electromagnetic pulses. The magnetic f…
Random Fan-Out State Induced by Site-Random Interlayer Couplings
Ryo Tamura, Naoki Kawashima, Takafumi Yamamoto +2
We study the low-temperature properties of a classical Heisenberg model with site-random interlayer couplings on the cubic lattice. This model is introduced as a simplified effecti…