The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
T. Tanaka - One of the best experts on this subject based on the ideXlab platform.
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indication of intrinsic spin hall effect in 4d and 5d Transition Metals
Physical Review B, 2011Co-Authors: M Morota, Hitoshi Kontani, T. Tanaka, Yasuhiro Niimi, Kohei Ohnishi, Takashi Kimura, Yoshichika OtaniAbstract:We have investigated spin Hall effects in 4$d$ and 5$d$ Transition Metals, Nb, Ta, Mo, Pd and Pt, by incorporating the spin absorption method in the lateral spin valve structure; where large spin current preferably relaxes into the Transition Metals, exhibiting strong spin-orbit interactions. Thereby nonlocal spin valve measurements enable us to evaluate their spin Hall conductivities. The sign of the spin Hall conductivity changes systematically depending on the number of $d$ electrons. This tendency is in good agreement with the recent theoretical calculation based on the intrinsic spin Hall effect.
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intrinsic spin hall effect and orbital hall effect in 4 d and 5 d Transition Metals
Physical Review B, 2008Co-Authors: T. Tanaka, Dai S. Hirashima, M. Naito, Hitoshi Kontani, T. Naito, K. Yamada, J. InoueAbstract:We study the intrinsic spin Hall conductivity (SHC) in various $5d$ Transition Metals (Ta, W, Re, Os, Ir, Pt, and Au) and $4d$ Transition Metals (Nb, Mo, Tc, Ru, Rh, Pd, and Ag) based on the Naval Research Laboratory tight-binding model, which enables us to perform quantitatively reliable analysis. In each metal, the obtained intrinsic SHC is independent of resistivity in the low resistive regime $(\ensuremath{\rho}l50\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\ensuremath{\Omega}\phantom{\rule{0.2em}{0ex}}\mathrm{cm})$ whereas it decreases in proportion to ${\ensuremath{\rho}}^{\ensuremath{-}2}$ in the high resistive regime. In the low resistive regime, the SHC takes a large positive value in Pt and Pd, both of which have approximately nine $d$ electrons per ion $({n}_{d}=9)$. On the other hand, the SHC takes a large negative value in Ta, Nb, W, and Mo, where ${n}_{d}l5$. In Transition Metals, a conduction electron acquires the trajectory-dependent phase factor that originates from the atomic wave function. This phase factor, which is reminiscent of the Aharonov--Bohm phase, is the origin of the SHC in paramagnetic Metals and that of the anomalous Hall conductivity in ferromagnetic Metals. Furthermore, each Transition metal shows huge and positive $d$-orbital Hall conductivity (OHC), independent of the strength of the spin-orbit interaction. Since the OHC is much larger than the SHC, it will be possible to realize an orbitronics device made of Transition Metals.
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Intrinsic spin Hall effect and orbital Hall effect in 4d and 5d Transition Metals
Physical Review B - Condensed Matter and Materials Physics, 2008Co-Authors: T. Tanaka, Dai S. Hirashima, M. Naito, Hitoshi Kontani, T. Naito, K. Yamada, J. InoueAbstract:We study the intrinsic spin Hall conductivity (SHC) in various $5d$-Transition Metals (Ta, W, Re, Os, Ir, Pt, and Au) and 4d-Transition Metals (Nb, Mo, Tc, Ru, Rh, Pd, and Ag) based on the Naval Research Laboratory tight-binding model, which enables us to perform quantitatively reliable analysis. In each metal, the obtained intrinsic SHC is independent of resistivity in the low resistive regime ($\rho < 50 \mu\Omega\text{cm}$) whereas it decreases in proportion to $\rho^{-2}$ in the high resistive regime. In the low resistive regime, the SHC takes a large positive value in Pt and Pd, both of which have approximately nine $d$-electrons per ion ($n_d=9$). On the other hand, the SHC takes a large negative value in Ta, Nb, W, and Mo where $n_d
J. Inoue - One of the best experts on this subject based on the ideXlab platform.
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intrinsic spin hall effect and orbital hall effect in 4 d and 5 d Transition Metals
Physical Review B, 2008Co-Authors: T. Tanaka, Dai S. Hirashima, M. Naito, Hitoshi Kontani, T. Naito, K. Yamada, J. InoueAbstract:We study the intrinsic spin Hall conductivity (SHC) in various $5d$ Transition Metals (Ta, W, Re, Os, Ir, Pt, and Au) and $4d$ Transition Metals (Nb, Mo, Tc, Ru, Rh, Pd, and Ag) based on the Naval Research Laboratory tight-binding model, which enables us to perform quantitatively reliable analysis. In each metal, the obtained intrinsic SHC is independent of resistivity in the low resistive regime $(\ensuremath{\rho}l50\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\ensuremath{\Omega}\phantom{\rule{0.2em}{0ex}}\mathrm{cm})$ whereas it decreases in proportion to ${\ensuremath{\rho}}^{\ensuremath{-}2}$ in the high resistive regime. In the low resistive regime, the SHC takes a large positive value in Pt and Pd, both of which have approximately nine $d$ electrons per ion $({n}_{d}=9)$. On the other hand, the SHC takes a large negative value in Ta, Nb, W, and Mo, where ${n}_{d}l5$. In Transition Metals, a conduction electron acquires the trajectory-dependent phase factor that originates from the atomic wave function. This phase factor, which is reminiscent of the Aharonov--Bohm phase, is the origin of the SHC in paramagnetic Metals and that of the anomalous Hall conductivity in ferromagnetic Metals. Furthermore, each Transition metal shows huge and positive $d$-orbital Hall conductivity (OHC), independent of the strength of the spin-orbit interaction. Since the OHC is much larger than the SHC, it will be possible to realize an orbitronics device made of Transition Metals.
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Intrinsic spin Hall effect and orbital Hall effect in 4d and 5d Transition Metals
Physical Review B - Condensed Matter and Materials Physics, 2008Co-Authors: T. Tanaka, Dai S. Hirashima, M. Naito, Hitoshi Kontani, T. Naito, K. Yamada, J. InoueAbstract:We study the intrinsic spin Hall conductivity (SHC) in various $5d$-Transition Metals (Ta, W, Re, Os, Ir, Pt, and Au) and 4d-Transition Metals (Nb, Mo, Tc, Ru, Rh, Pd, and Ag) based on the Naval Research Laboratory tight-binding model, which enables us to perform quantitatively reliable analysis. In each metal, the obtained intrinsic SHC is independent of resistivity in the low resistive regime ($\rho < 50 \mu\Omega\text{cm}$) whereas it decreases in proportion to $\rho^{-2}$ in the high resistive regime. In the low resistive regime, the SHC takes a large positive value in Pt and Pd, both of which have approximately nine $d$-electrons per ion ($n_d=9$). On the other hand, the SHC takes a large negative value in Ta, Nb, W, and Mo where $n_d
Hitoshi Kontani - One of the best experts on this subject based on the ideXlab platform.
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indication of intrinsic spin hall effect in 4d and 5d Transition Metals
Physical Review B, 2011Co-Authors: M Morota, Hitoshi Kontani, T. Tanaka, Yasuhiro Niimi, Kohei Ohnishi, Takashi Kimura, Yoshichika OtaniAbstract:We have investigated spin Hall effects in 4$d$ and 5$d$ Transition Metals, Nb, Ta, Mo, Pd and Pt, by incorporating the spin absorption method in the lateral spin valve structure; where large spin current preferably relaxes into the Transition Metals, exhibiting strong spin-orbit interactions. Thereby nonlocal spin valve measurements enable us to evaluate their spin Hall conductivities. The sign of the spin Hall conductivity changes systematically depending on the number of $d$ electrons. This tendency is in good agreement with the recent theoretical calculation based on the intrinsic spin Hall effect.
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intrinsic spin hall effect and orbital hall effect in 4 d and 5 d Transition Metals
Physical Review B, 2008Co-Authors: T. Tanaka, Dai S. Hirashima, M. Naito, Hitoshi Kontani, T. Naito, K. Yamada, J. InoueAbstract:We study the intrinsic spin Hall conductivity (SHC) in various $5d$ Transition Metals (Ta, W, Re, Os, Ir, Pt, and Au) and $4d$ Transition Metals (Nb, Mo, Tc, Ru, Rh, Pd, and Ag) based on the Naval Research Laboratory tight-binding model, which enables us to perform quantitatively reliable analysis. In each metal, the obtained intrinsic SHC is independent of resistivity in the low resistive regime $(\ensuremath{\rho}l50\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\ensuremath{\Omega}\phantom{\rule{0.2em}{0ex}}\mathrm{cm})$ whereas it decreases in proportion to ${\ensuremath{\rho}}^{\ensuremath{-}2}$ in the high resistive regime. In the low resistive regime, the SHC takes a large positive value in Pt and Pd, both of which have approximately nine $d$ electrons per ion $({n}_{d}=9)$. On the other hand, the SHC takes a large negative value in Ta, Nb, W, and Mo, where ${n}_{d}l5$. In Transition Metals, a conduction electron acquires the trajectory-dependent phase factor that originates from the atomic wave function. This phase factor, which is reminiscent of the Aharonov--Bohm phase, is the origin of the SHC in paramagnetic Metals and that of the anomalous Hall conductivity in ferromagnetic Metals. Furthermore, each Transition metal shows huge and positive $d$-orbital Hall conductivity (OHC), independent of the strength of the spin-orbit interaction. Since the OHC is much larger than the SHC, it will be possible to realize an orbitronics device made of Transition Metals.
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Intrinsic spin Hall effect and orbital Hall effect in 4d and 5d Transition Metals
Physical Review B - Condensed Matter and Materials Physics, 2008Co-Authors: T. Tanaka, Dai S. Hirashima, M. Naito, Hitoshi Kontani, T. Naito, K. Yamada, J. InoueAbstract:We study the intrinsic spin Hall conductivity (SHC) in various $5d$-Transition Metals (Ta, W, Re, Os, Ir, Pt, and Au) and 4d-Transition Metals (Nb, Mo, Tc, Ru, Rh, Pd, and Ag) based on the Naval Research Laboratory tight-binding model, which enables us to perform quantitatively reliable analysis. In each metal, the obtained intrinsic SHC is independent of resistivity in the low resistive regime ($\rho < 50 \mu\Omega\text{cm}$) whereas it decreases in proportion to $\rho^{-2}$ in the high resistive regime. In the low resistive regime, the SHC takes a large positive value in Pt and Pd, both of which have approximately nine $d$-electrons per ion ($n_d=9$). On the other hand, the SHC takes a large negative value in Ta, Nb, W, and Mo where $n_d
Yoshichika Otani - One of the best experts on this subject based on the ideXlab platform.
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indication of intrinsic spin hall effect in 4d and 5d Transition Metals
Physical Review B, 2011Co-Authors: M Morota, Hitoshi Kontani, T. Tanaka, Yasuhiro Niimi, Kohei Ohnishi, Takashi Kimura, Yoshichika OtaniAbstract:We have investigated spin Hall effects in 4$d$ and 5$d$ Transition Metals, Nb, Ta, Mo, Pd and Pt, by incorporating the spin absorption method in the lateral spin valve structure; where large spin current preferably relaxes into the Transition Metals, exhibiting strong spin-orbit interactions. Thereby nonlocal spin valve measurements enable us to evaluate their spin Hall conductivities. The sign of the spin Hall conductivity changes systematically depending on the number of $d$ electrons. This tendency is in good agreement with the recent theoretical calculation based on the intrinsic spin Hall effect.
Jürgen Hafner - One of the best experts on this subject based on the ideXlab platform.
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ital ab ital initio molecular dynamics for open shell Transition Metals
Physical Review B, 1993Co-Authors: Georg Kresse, Jürgen HafnerAbstract:We show that quantum-mechanical molecular-dynamics simulations in a finite-temperature local-density approximation based on the calculation of the electronic ground state and of the Hellmann-Feynman forces after each time step are feasible for liquid noble and Transition Metals. This is possible with the use of Vanderbilt-type ultrasoft'' pseudopotentials and efficient conjugate-gradient techniques for the determination of the electronic ground state. Results for liquid copper and vanadium are presented.
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Ab initio molecular dynamics for open-shell Transition Metals
Phys. Rev. B, 1993Co-Authors: Georg Kresse, Jürgen HafnerAbstract:Ab initio molecular dynamics for open-shell Transition Metals G. Kresse and J. Hafner Phys. Rev. B 48, 13115 – Published 1 November 1993 Citing Articles (2,293) ABSTRACT We show that quantum-mechanical molecular-dynamics simulations in a finite-temperature local-density approximation based on the calculation of the electronic ground state and of the Hellmann-Feynman forces after each time step are feasible for liquid noble and Transition Metals. This is possible with the use of Vanderbilt-type ‘‘ultrasoft’’ pseudopotentials and efficient conjugate-gradient techniques for the determination of the electronic ground state. Results for liquid copper and vanadium are presented. Received 2 July 1993 DOI: AUTHORS & AFFILIATIONS G. Kresse and J. Hafner Institut für Theoretische Physik Technische Universiät Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria
