The Experts below are selected from a list of 3813 Experts worldwide ranked by ideXlab platform
Duncan K. Maude - One of the best experts on this subject based on the ideXlab platform.
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High-field magnetotransmission investigation of natural graphite
Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011Co-Authors: N. Ubrig, Milan Orlita, Duncan K. Maude, P. Plochocka, P. Kossacki, O. Portugall, And G.l.j.a. RikkenAbstract:Magnetotransmission measurements in magnetic fields in the range B=20–60 T have been performed to probe the H- and K-point Landau level transitions in natural graphite. At the H point, two series of transitions, whose energy evolves as √B, are observed. A reduced Slonczewski-Weiss-McClure model with only two parameters to describe the intralayer (γ0) and interlayer (γ1) coupling correctly describes all observed transitions. Polarization-resolved measurements confirm that the observed apparent splitting of the H-point transitions at high magnetic field cannot be attributed to an asymmetry of the Dirac cone.
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Consistent interpretation of the low-temperature magnetotransport in graphite using the Slonczewski-Weiss-McClure 3D band-structure calculations.
Physical review letters, 2010Co-Authors: Johannes Schneider, Milan Orlita, Marek Potemski, Duncan K. MaudeAbstract:Magnetotransport of natural graphite and highly oriented pyrolytic graphite (HOPG) has been measured at mK temperatures. Quantum oscillations for both electron and hole carriers are observed with orbital angular momentum quantum number up to $N\approx90$. A remarkable agreement is obtained when comparing the data and the predictions of the Slonczewski--Weiss--McClure tight binding model for massive fermions. No evidence for Dirac fermions is observed in the transport data which is dominated by the crossing of the Landau bands at the Fermi level, corresponding to $dE/dk_z=0$, which occurs away from the $H$ point where Dirac fermions are expected.
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Reply to comment (arXiv:0907.2026v2) on "Consistent Interpretation of the Low-Temperature Magnetotransport in Graphite Using the Slonczewski-Weiss-McClure 3D Band-Structure Calculations" (arXiv:0902.1925)
arXiv: Mesoscale and Nanoscale Physics, 2010Co-Authors: Johannes Schneider, Milan Orlita, Marek Potemski, Duncan K. MaudeAbstract:Reply to comment (arXiv:0907.2026v2) on "Consistent Interpretation of the Low-Temperature Magnetotransport in Graphite Using the Slonczewski-Weiss-McClure 3D Band-Structure Calculations" (arXiv:0902.1925)
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Consistent interpretation of the low-temperature magnetotransport in graphite using the Slonczewski-Weiss-McClure 3D band-structure calculations.
Physical review letters, 2009Co-Authors: J M Schneider, Milan Orlita, Marek Potemski, Duncan K. MaudeAbstract:Magnetotransport of natural graphite and highly oriented pyrolytic graphite has been measured at mK temperatures. Quantum oscillations for both electron and hole carriers are observed with an orbital angular momentum quantum number up to N approximately 90. A remarkable agreement is obtained when comparing the data and the predictions of the Slonczewski-Weiss-McClure tight binding model for massive fermions. No evidence for Dirac fermions is observed in the transport data which are dominated by the crossing of the Landau bands at the Fermi level, corresponding to dE/dk_{z}=0, which occurs away from the H point where Dirac fermions are expected.
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Magneto-transmission of multi-layer epitaxial graphene and bulk graphite: A comparison
Solid State Communications, 2009Co-Authors: Milan Orlita, Mike Sprinkle, Claire Berger, Clément Faugeras, Gérard Martinez, Duncan K. Maude, Johannes Schneider, W. A. De Heer, Marek PotemskiAbstract:Abstract The magneto-transmission of a thin layer of bulk graphite is compared with spectra taken on multi-layer epitaxial graphene prepared by thermal decomposition of a SiC crystal. We focus on the spectral features evolving as B , which are evidence for the presence of Dirac fermions in both materials. Whereas the results on multi-layer epitaxial graphene can be interpreted within the model of 2D Dirac fermions, the data obtained on bulk graphite can only be explained taking into account the 3D nature of graphite, e.g. by using the standard Slonczewski–Weiss–McClure model.
Claudio Serpico - One of the best experts on this subject based on the ideXlab platform.
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Micromagnetic study of statistical switching in magnetic tunnel junctions stabilized by perpendicular shape anisotropy
Physica B: Condensed Matter, 2020Co-Authors: Massimiliano D'aquino, S. Perna, Claudio SerpicoAbstract:Abstract Magnetic tunnel junctions with free layer thermally stabilized by the combined action of perpendicular magneto-crystalline and shape anisotropy are considered. The spin-transfer torque driven switching dynamics is studied. Analytical formulas for switching time statistical distributions and write-error rate are derived under the assumption of ballistic dynamics. The analytical results are compared with full micromagnetic and macrospin simulations based on stochastic Landau-Lifshitz-Gilbert-Slonczewski equation. This comparison reveals quantitative agreement with the proposed analytical theory.
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Spin torque in the framework of random magnetization dynamics driven by a jump-noise process
Physica B: Condensed Matter, 2014Co-Authors: G. Bertotti, Claudio Serpico, Z. Liu, Andrew Lee, Isaak D. MayergoyzAbstract:Abstract It is demonstrated that the Slonczewski spin-torque term can be naturally derived from the equation for magnetization dynamics driven by a jump-noise process. The central point of the derivation is the modification of transition probability rate of the jump-noise process caused by spin-polarized current injection. This modification results in two distinct terms in the expected value of the jump-noise process: the traditional one corresponding to the Landau–Lifshitz damping and another one representing the Slonczewski spin-torque term.
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Analysis of power spectral density of random Landau-Lifshitz-Slonczewski dynamics by using stochastic processes on graphs
Journal of Applied Physics, 2008Co-Authors: Isaak D. Mayergoyz, Claudio Serpico, Giorgio Bertotti, R. Bonin, Massimiliano D'aquinoAbstract:A technique for computing the autocorrelation function and power spectral density of stochastic Landau-Lifshitz-Slonczewski dynamics is presented. This technique is based on the mathematical machinery of stochastic processes on graphs.
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Spin-torque-driven magnetization dynamics in nanomagnets subject to magnetic fields perpendicular to the sample plane
Journal of Applied Physics, 2006Co-Authors: R. Bonin, Giorgio Bertotti, Isaak D. Mayergoyz, Claudio SerpicoAbstract:We analytically solve the Landau-Lifshitz-Gilbert equation with the addition of the spin-torque term proposed by Slonczewski [J. Magn. Magn. Mater. 159, L1 (1996)] for the case of external magnetic field perpendicular to the sample plane. By using methods of nonlinear dynamical system theory we construct the complete stability diagram of the spin-torque-driven dynamics in the field-current control plane. Our predictions are compared with recent experimental results.
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Analysis of random Landau-Lifshitz dynamics by using stochastic processes on graphs
Journal of Applied Physics, 2006Co-Authors: G. Bertotti, Isaak D. Mayergoyz, Claudio SerpicoAbstract:A randomly perturbed Landau-Lifshitz-Slonczewski equation is transformed into a stochastic differential equation for free energy. The stochastic differential equation is defined in graphs that reflect the energy landscape of magnetic system. The stochastic differential equation for energy contains additional thermally generated drift terms that may appreciably affect slow time-scale magnetization dynamics. The effect of these thermal drift terms on energy distribution near equilibria and limit cycles (self-oscillations) is discussed.
Jiangwei Cao - One of the best experts on this subject based on the ideXlab platform.
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tuning Slonczewski like torque and dzyaloshinskii moriya interaction by inserting a pt spacer layer in ta cofeb mgo structures
Applied Physics Letters, 2018Co-Authors: Yifei Chen, Qihan Zhang, Junxue Jia, Yuqiang Zheng, Ying Wang, Xiaolong Fan, Jiangwei CaoAbstract:Slonczewski-like torque and the Dzyaloshinskii–Moriya interaction (DMI) are important factors in current-induced magnetization switching and domain-wall motion seen in ferromagnetic metal (FM)/heavy metal (HM) structures. We demonstrate the tuning of both factors by inserting a thin Pt layer between Ta and CoFeB in the Ta/CoFeB/MgO structures. The results suggest that the Slonczewski-like torque and DMI decreases with increasing Pt thickness (tPt) in the range 0–1 nm. In consequence, the critical switching current density from the induced spin-orbit torque (SOT) increases whereas the required in-plane field for deterministic switching decreases. The sign of the DMI reverses around tPt = 1 nm, confirming that D has the opposite sign at the Ta/CoFeB and Pt/CoFeB interfaces; but its intensity saturates at tPt = 3 nm, suggesting that several interface monolayers may contribute to the DMI. Our results verifies that a thin HM interlayer may be a suitable route to tailor the SOTs and DMI at the HM/FM interface, as well as the current-induced magnetization switching in these structures.Slonczewski-like torque and the Dzyaloshinskii–Moriya interaction (DMI) are important factors in current-induced magnetization switching and domain-wall motion seen in ferromagnetic metal (FM)/heavy metal (HM) structures. We demonstrate the tuning of both factors by inserting a thin Pt layer between Ta and CoFeB in the Ta/CoFeB/MgO structures. The results suggest that the Slonczewski-like torque and DMI decreases with increasing Pt thickness (tPt) in the range 0–1 nm. In consequence, the critical switching current density from the induced spin-orbit torque (SOT) increases whereas the required in-plane field for deterministic switching decreases. The sign of the DMI reverses around tPt = 1 nm, confirming that D has the opposite sign at the Ta/CoFeB and Pt/CoFeB interfaces; but its intensity saturates at tPt = 3 nm, suggesting that several interface monolayers may contribute to the DMI. Our results verifies that a thin HM interlayer may be a suitable route to tailor the SOTs and DMI at the HM/FM interface, ...
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Tuning Slonczewski-like torque and Dzyaloshinskii–Moriya interaction by inserting a Pt spacer layer in Ta/CoFeB/MgO structures
Applied Physics Letters, 2018Co-Authors: Yifei Chen, Qihan Zhang, Junxue Jia, Yuqiang Zheng, Ying Wang, Xiaolong Fan, Jiangwei CaoAbstract:Slonczewski-like torque and the Dzyaloshinskii–Moriya interaction (DMI) are important factors in current-induced magnetization switching and domain-wall motion seen in ferromagnetic metal (FM)/heavy metal (HM) structures. We demonstrate the tuning of both factors by inserting a thin Pt layer between Ta and CoFeB in the Ta/CoFeB/MgO structures. The results suggest that the Slonczewski-like torque and DMI decreases with increasing Pt thickness (tPt) in the range 0–1 nm. In consequence, the critical switching current density from the induced spin-orbit torque (SOT) increases whereas the required in-plane field for deterministic switching decreases. The sign of the DMI reverses around tPt = 1 nm, confirming that D has the opposite sign at the Ta/CoFeB and Pt/CoFeB interfaces; but its intensity saturates at tPt = 3 nm, suggesting that several interface monolayers may contribute to the DMI. Our results verifies that a thin HM interlayer may be a suitable route to tailor the SOTs and DMI at the HM/FM interface, as well as the current-induced magnetization switching in these structures.Slonczewski-like torque and the Dzyaloshinskii–Moriya interaction (DMI) are important factors in current-induced magnetization switching and domain-wall motion seen in ferromagnetic metal (FM)/heavy metal (HM) structures. We demonstrate the tuning of both factors by inserting a thin Pt layer between Ta and CoFeB in the Ta/CoFeB/MgO structures. The results suggest that the Slonczewski-like torque and DMI decreases with increasing Pt thickness (tPt) in the range 0–1 nm. In consequence, the critical switching current density from the induced spin-orbit torque (SOT) increases whereas the required in-plane field for deterministic switching decreases. The sign of the DMI reverses around tPt = 1 nm, confirming that D has the opposite sign at the Ta/CoFeB and Pt/CoFeB interfaces; but its intensity saturates at tPt = 3 nm, suggesting that several interface monolayers may contribute to the DMI. Our results verifies that a thin HM interlayer may be a suitable route to tailor the SOTs and DMI at the HM/FM interface, ...
Marek Potemski - One of the best experts on this subject based on the ideXlab platform.
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Consistent interpretation of the low-temperature magnetotransport in graphite using the Slonczewski-Weiss-McClure 3D band-structure calculations.
Physical review letters, 2010Co-Authors: Johannes Schneider, Milan Orlita, Marek Potemski, Duncan K. MaudeAbstract:Magnetotransport of natural graphite and highly oriented pyrolytic graphite (HOPG) has been measured at mK temperatures. Quantum oscillations for both electron and hole carriers are observed with orbital angular momentum quantum number up to $N\approx90$. A remarkable agreement is obtained when comparing the data and the predictions of the Slonczewski--Weiss--McClure tight binding model for massive fermions. No evidence for Dirac fermions is observed in the transport data which is dominated by the crossing of the Landau bands at the Fermi level, corresponding to $dE/dk_z=0$, which occurs away from the $H$ point where Dirac fermions are expected.
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Reply to comment (arXiv:0907.2026v2) on "Consistent Interpretation of the Low-Temperature Magnetotransport in Graphite Using the Slonczewski-Weiss-McClure 3D Band-Structure Calculations" (arXiv:0902.1925)
arXiv: Mesoscale and Nanoscale Physics, 2010Co-Authors: Johannes Schneider, Milan Orlita, Marek Potemski, Duncan K. MaudeAbstract:Reply to comment (arXiv:0907.2026v2) on "Consistent Interpretation of the Low-Temperature Magnetotransport in Graphite Using the Slonczewski-Weiss-McClure 3D Band-Structure Calculations" (arXiv:0902.1925)
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Consistent interpretation of the low-temperature magnetotransport in graphite using the Slonczewski-Weiss-McClure 3D band-structure calculations.
Physical review letters, 2009Co-Authors: J M Schneider, Milan Orlita, Marek Potemski, Duncan K. MaudeAbstract:Magnetotransport of natural graphite and highly oriented pyrolytic graphite has been measured at mK temperatures. Quantum oscillations for both electron and hole carriers are observed with an orbital angular momentum quantum number up to N approximately 90. A remarkable agreement is obtained when comparing the data and the predictions of the Slonczewski-Weiss-McClure tight binding model for massive fermions. No evidence for Dirac fermions is observed in the transport data which are dominated by the crossing of the Landau bands at the Fermi level, corresponding to dE/dk_{z}=0, which occurs away from the H point where Dirac fermions are expected.
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Magneto-transmission of multi-layer epitaxial graphene and bulk graphite: A comparison
Solid State Communications, 2009Co-Authors: Milan Orlita, Mike Sprinkle, Claire Berger, Clément Faugeras, Gérard Martinez, Duncan K. Maude, Johannes Schneider, W. A. De Heer, Marek PotemskiAbstract:Abstract The magneto-transmission of a thin layer of bulk graphite is compared with spectra taken on multi-layer epitaxial graphene prepared by thermal decomposition of a SiC crystal. We focus on the spectral features evolving as B , which are evidence for the presence of Dirac fermions in both materials. Whereas the results on multi-layer epitaxial graphene can be interpreted within the model of 2D Dirac fermions, the data obtained on bulk graphite can only be explained taking into account the 3D nature of graphite, e.g. by using the standard Slonczewski–Weiss–McClure model.
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A consistent interpretation of the low temperature magneto-transport in graphite using the Slonczewski--Weiss--McClure 3D band structure calculations
2009Co-Authors: Johannes Schneider, Milan Orlita, Marek Potemski, Duncan K. MaudeAbstract:Magnetotransport of natural graphite and highly oriented pyrolytic graphite (HOPG) has been measured at mK temperatures. Quantum oscillations for both electron and hole carriers are observed with orbital angular momentum quantum number up to $N\approx90$. A remarkable agreement is obtained when comparing the data and the predictions of the Slonczewski--Weiss--McClure tight binding model for massive fermions. No evidence for Dirac fermions is observed in the transport data which is dominated by the crossing of the Landau bands at the Fermi level, corresponding to $dE/dk_z=0$, which occurs away from the $H$ point where Dirac fermions are expected.
Milan Orlita - One of the best experts on this subject based on the ideXlab platform.
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High-field magnetotransmission investigation of natural graphite
Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011Co-Authors: N. Ubrig, Milan Orlita, Duncan K. Maude, P. Plochocka, P. Kossacki, O. Portugall, And G.l.j.a. RikkenAbstract:Magnetotransmission measurements in magnetic fields in the range B=20–60 T have been performed to probe the H- and K-point Landau level transitions in natural graphite. At the H point, two series of transitions, whose energy evolves as √B, are observed. A reduced Slonczewski-Weiss-McClure model with only two parameters to describe the intralayer (γ0) and interlayer (γ1) coupling correctly describes all observed transitions. Polarization-resolved measurements confirm that the observed apparent splitting of the H-point transitions at high magnetic field cannot be attributed to an asymmetry of the Dirac cone.
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Consistent interpretation of the low-temperature magnetotransport in graphite using the Slonczewski-Weiss-McClure 3D band-structure calculations.
Physical review letters, 2010Co-Authors: Johannes Schneider, Milan Orlita, Marek Potemski, Duncan K. MaudeAbstract:Magnetotransport of natural graphite and highly oriented pyrolytic graphite (HOPG) has been measured at mK temperatures. Quantum oscillations for both electron and hole carriers are observed with orbital angular momentum quantum number up to $N\approx90$. A remarkable agreement is obtained when comparing the data and the predictions of the Slonczewski--Weiss--McClure tight binding model for massive fermions. No evidence for Dirac fermions is observed in the transport data which is dominated by the crossing of the Landau bands at the Fermi level, corresponding to $dE/dk_z=0$, which occurs away from the $H$ point where Dirac fermions are expected.
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Reply to comment (arXiv:0907.2026v2) on "Consistent Interpretation of the Low-Temperature Magnetotransport in Graphite Using the Slonczewski-Weiss-McClure 3D Band-Structure Calculations" (arXiv:0902.1925)
arXiv: Mesoscale and Nanoscale Physics, 2010Co-Authors: Johannes Schneider, Milan Orlita, Marek Potemski, Duncan K. MaudeAbstract:Reply to comment (arXiv:0907.2026v2) on "Consistent Interpretation of the Low-Temperature Magnetotransport in Graphite Using the Slonczewski-Weiss-McClure 3D Band-Structure Calculations" (arXiv:0902.1925)
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Consistent interpretation of the low-temperature magnetotransport in graphite using the Slonczewski-Weiss-McClure 3D band-structure calculations.
Physical review letters, 2009Co-Authors: J M Schneider, Milan Orlita, Marek Potemski, Duncan K. MaudeAbstract:Magnetotransport of natural graphite and highly oriented pyrolytic graphite has been measured at mK temperatures. Quantum oscillations for both electron and hole carriers are observed with an orbital angular momentum quantum number up to N approximately 90. A remarkable agreement is obtained when comparing the data and the predictions of the Slonczewski-Weiss-McClure tight binding model for massive fermions. No evidence for Dirac fermions is observed in the transport data which are dominated by the crossing of the Landau bands at the Fermi level, corresponding to dE/dk_{z}=0, which occurs away from the H point where Dirac fermions are expected.
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Magneto-transmission of multi-layer epitaxial graphene and bulk graphite: A comparison
Solid State Communications, 2009Co-Authors: Milan Orlita, Mike Sprinkle, Claire Berger, Clément Faugeras, Gérard Martinez, Duncan K. Maude, Johannes Schneider, W. A. De Heer, Marek PotemskiAbstract:Abstract The magneto-transmission of a thin layer of bulk graphite is compared with spectra taken on multi-layer epitaxial graphene prepared by thermal decomposition of a SiC crystal. We focus on the spectral features evolving as B , which are evidence for the presence of Dirac fermions in both materials. Whereas the results on multi-layer epitaxial graphene can be interpreted within the model of 2D Dirac fermions, the data obtained on bulk graphite can only be explained taking into account the 3D nature of graphite, e.g. by using the standard Slonczewski–Weiss–McClure model.
