The Experts below are selected from a list of 131391 Experts worldwide ranked by ideXlab platform
Zhou Zhou Sun - One of the best experts on this subject based on the ideXlab platform.
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Theoretical Limit in the magnetization reversal of stoner particles.
Physical review letters, 2007Co-Authors: Xiangrong Wang, Zhou Zhou SunAbstract:Magnetization reversal of uniaxial Stoner particles under the Slonczewski spin-transfer torques of polarized electric currents is investigated. Based on the modified Landau-Lifshitz-Gilbert equation of magnetization dynamics, the Theoretical Limit of critical currents required to reverse a magnetization with an arbitrary polarized current is obtained. Under a constant polarization degree and constant current amplitude, the optimal current pulse for the fastest magnetization reversal is derived. These results can be used as benchmarks to evaluate different reversal strategies besides other possible usages.
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Theoretical Limit of the minimal magnetization switching field and the optimal field pulse for Stoner particles.
Physical review letters, 2006Co-Authors: Zhou Zhou Sun, Xiangrong WangAbstract:The Theoretical Limit of the minimal magnetization switching field and the optimal field pulse design for uniaxial Stoner particles are investigated. Two results are obtained. One is the existence of a Theoretical Limit of the smallest magnetic field out of all possible designs. It is shown that the Limit is proportional to the damping constant in the weak damping regime and approaches the Stoner-Wohlfarth (SW) Limit at large damping. For a realistic damping constant, this Limit is more than 10 times smaller than that of so-called precessional magnetization reversal under a noncollinear static field. The other is on the optimal field pulse design: if the magnitude of a magnetic field does not change, but its direction can vary during a reversal process, there is an optimal design that gives the shortest switching time. The switching time depends on the field magnitude, damping constant, and magnetic anisotropy.
Xiangrong Wang - One of the best experts on this subject based on the ideXlab platform.
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Theoretical Limit in the magnetization reversal of stoner particles.
Physical review letters, 2007Co-Authors: Xiangrong Wang, Zhou Zhou SunAbstract:Magnetization reversal of uniaxial Stoner particles under the Slonczewski spin-transfer torques of polarized electric currents is investigated. Based on the modified Landau-Lifshitz-Gilbert equation of magnetization dynamics, the Theoretical Limit of critical currents required to reverse a magnetization with an arbitrary polarized current is obtained. Under a constant polarization degree and constant current amplitude, the optimal current pulse for the fastest magnetization reversal is derived. These results can be used as benchmarks to evaluate different reversal strategies besides other possible usages.
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Theoretical Limit of the minimal magnetization switching field and the optimal field pulse for Stoner particles.
Physical review letters, 2006Co-Authors: Zhou Zhou Sun, Xiangrong WangAbstract:The Theoretical Limit of the minimal magnetization switching field and the optimal field pulse design for uniaxial Stoner particles are investigated. Two results are obtained. One is the existence of a Theoretical Limit of the smallest magnetic field out of all possible designs. It is shown that the Limit is proportional to the damping constant in the weak damping regime and approaches the Stoner-Wohlfarth (SW) Limit at large damping. For a realistic damping constant, this Limit is more than 10 times smaller than that of so-called precessional magnetization reversal under a noncollinear static field. The other is on the optimal field pulse design: if the magnitude of a magnetic field does not change, but its direction can vary during a reversal process, there is an optimal design that gives the shortest switching time. The switching time depends on the field magnitude, damping constant, and magnetic anisotropy.
Pierre-cyrille Heam - One of the best experts on this subject based on the ideXlab platform.
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A Theoretical Limit for safety verification techniques with regular fix-point computations
Information Processing Letters, 2008Co-Authors: Yohan Boichut, Pierre-cyrille HeamAbstract:In computer aided verification, the reachability problem is particularly relevant for safety analyses. Given a regular tree language L, a term t and a relation R, the reachability problem consists in deciding whether there exist a positive integer n and terms t"0,t"1,...,t"n such that t"[email protected]?L, t"n=t and for every 0=
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A Theoretical Limit for Safety Verification Techniques with Regular Fix-point Computations
2008Co-Authors: Yohan Boichut, Pierre-cyrille HeamAbstract:In computer aided verification, the reachability problem is particularly relevant for safety analyses. Given a regular tree language L, a term t and a relation R, the reachability problem consists in deciding whether a sequence of terms, beginning with a term of L and terminating on t and such that two successive terms of this sequence are in relation according to R, is constructable. In this case, the term t is said to be reachable, otherwise it is said unreachable. This problem is decidable for particular kinds of relations, but it is known to be undecidable in general, even if L is finite. Several approaches to tackle the unreachability problem are based on the computation of an R-closed regular language containing L. In this paper we show a Theoretical Limit to this kind of approaches for this problem.
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A Theoretical Limit for Safety Verification Techniques with Regular Fix-point Computations
Information Processing Letters, 2008Co-Authors: Yohan Boichut, Pierre-cyrille HeamAbstract:In computer aided verification, the reachability problem is particularly relevant for safety analyses. Given a regular tree language L, a term t and a relation R, the reachability problem consists in deciding whether there exist a positive integer n and terms t0,t1,...,tn such that t0set membership, variantL, tn=t and for every 0less-than-or-equals, slanti
Christian Enz - One of the best experts on this subject based on the ideXlab platform.
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Theoretical Limit of low temperature subthreshold swing in field effect transistors
IEEE Electron Device Letters, 2020Co-Authors: Arnout Beckers, Farzan Jazaeri, Christian EnzAbstract:This letter reports a temperature-dependent Limit for the subthreshold swing in MOSFETs that deviates from the Boltzmann Limit at deep-cryogenic temperatures. Below a critical temperature, the derived Limit saturates to a value that is independent of temperature and proportional to the characteristic decay of a band tail. The proposed expression tends to the Boltzmann Limit when the decay of the band tail tends to zero. Since the saturation is universally observed in different types of MOSFETs (regardless of dimension or semiconductor material), this suggests that an intrinsic mechanism is responsible for the band tail.
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revised Theoretical Limit of the subthreshold swing in field effect transistors
arXiv: Mesoscale and Nanoscale Physics, 2018Co-Authors: Arnout Beckers, Farzan Jazaeri, Christian EnzAbstract:This letter reports a temperature-dependent Limit for the subthreshold swing in MOSFETs that deviates from the Boltzmann Limit at deep-cryogenic temperatures. Below a critical temperature, the derived Limit saturates to a value that is independent of temperature and proportional to the extent of a band tail. Since the saturation is universally observed in different types of MOSFETs (regardless of dimension or semiconductor material), the band tail is attributed to the finite periodicity of the lattice in a semiconductor volume, and to a lesser extent to additional lattice perturbations such as defects or disorder.
Weiya Zhang - One of the best experts on this subject based on the ideXlab platform.
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pushing concentration of stationary solar concentrators to the Limit
Optics Express, 2010Co-Authors: Roland Winston, Weiya ZhangAbstract:We give the Theoretical Limit of concentration allowed by nonimaging optics for stationary solar concentrators after reviewing sun–earth geometry in direction cosine space. We then discuss the design principles that we follow to approach the maximum concentration along with examples including a hollow CPC trough, a dielectric CPC trough, and a 3D dielectric stationary solar concentrator which concentrates sun light four times (4x), eight hours per day year around.
