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Статті в журналах з теми "040406 Magnetism and Palaeomagnetism"
Borradaile, G. J., F. Lagroix, T. D. Hamilton, and D. A. Trebilcock. "Ophiolite Tectonics, Rock Magnetism and Palaeomagnetism, Cyprus." Surveys in Geophysics 31, no. 3 (December 10, 2009): 285–359. http://dx.doi.org/10.1007/s10712-009-9090-2.
Повний текст джерелаRadhakrishnamurty, C., and K. V. Subbarao. "Palaeomagnetism and rock magnetism of the Deccan traps." Journal of Earth System Science 99, no. 4 (December 1990): 669–80. http://dx.doi.org/10.1007/bf02840321.
Повний текст джерелаWells, Ray E. "Methods of rock magnetism and palaeomagnetism — Techniques and instrumentation." Marine Geology 65, no. 1-2 (May 1985): 192–93. http://dx.doi.org/10.1016/0025-3227(85)90053-2.
Повний текст джерелаBarton, C. E., and F. M. Peerdeman. "Palaeomagnetism, rock magnetism and evolution of the Great Barrier Reef." Exploration Geophysics 24, no. 2 (June 1993): 311–14. http://dx.doi.org/10.1071/eg993311.
Повний текст джерелаOrt, M. H., M. Porreca, and J. W. Geissman. "The use of palaeomagnetism and rock magnetism to understand volcanic processes: introduction." Geological Society, London, Special Publications 396, no. 1 (2015): 1–11. http://dx.doi.org/10.1144/sp396.17.
Повний текст джерелаSatyanarayana, K. V. V., Baldev R. Arora, and A. S. Janardhan. "Rock magnetism and palaeomagnetism of the Oddanchatram anorthosite, Tamil Nadu, South India." Geophysical Journal International 155, no. 3 (December 2003): 1081–92. http://dx.doi.org/10.1111/j.1365-246x.2003.02116.x.
Повний текст джерелаSagnotti, Leonardo, and Aldo Winkler. "Rock magnetism and palaeomagnetism of greigite-bearing mudstones in the Italian peninsula." Earth and Planetary Science Letters 165, no. 1 (January 1999): 67–80. http://dx.doi.org/10.1016/s0012-821x(98)00248-9.
Повний текст джерелаMcEnroe, Suzanne A., and Laurie L. Brown. "Palaeomagnetism, rock magnetism and geochemistry of Jurassic dykes and correlative redbeds, Massachusetts, USA." Geophysical Journal International 143, no. 1 (October 2000): 22–38. http://dx.doi.org/10.1046/j.1365-246x.2000.00193.x.
Повний текст джерелаFlorindo, Fabio, and Leonardo Sagnotti. "Palaeomagnetism and rock magnetism in the upper Pliocene Valle Ricca (Rome, Italy) section." Geophysical Journal International 123, no. 2 (November 1995): 340–54. http://dx.doi.org/10.1111/j.1365-246x.1995.tb06858.x.
Повний текст джерелаLangereis, C. G., and M. J. Dekkers. "Palaeomagnetism and rock magnetism of the Tortonian-Messinian boundary stratotype at Falconara, Sicily." Physics of the Earth and Planetary Interiors 71, no. 1-2 (April 1992): 100–111. http://dx.doi.org/10.1016/0031-9201(92)90032-q.
Повний текст джерелаДисертації з теми "040406 Magnetism and Palaeomagnetism"
Barron, Louise Lillias Margaret. "Effect of exchange and magnetostatic interactions on grain boundaries." Thesis, University of Edinburgh, 2011. http://hdl.handle.net/1842/5023.
Повний текст джерелаBhongsuwan, Tripob. "Research in rock magnetism and palaeomagnetism of recent sediments and palaeozoic to tertiary rocks in Thailand /." Luleå, 2000. http://epubl.luth.se/1402-1544/2000/28/index.html.
Повний текст джерелаMuxworthy, Adrian R. "Stability of magnetic remanence in multidomain magnetite." Thesis, University of Oxford, 1998. http://ora.ox.ac.uk/objects/uuid:bc70e665-4c54-4ab5-98fa-d43ccecd07a1.
Повний текст джерелаGregory, Laura C. "Active faulting and deformation of the Mongolian Altay Mountains." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:4bbed5b2-4597-4faa-b08c-c182d148c152.
Повний текст джерелаBourne, Mark David. "Palaeomagnetic and geochemical characterisation of geomagnetic excursions in the Quaternary." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:6315dfb6-052e-4c44-8bb1-7121cc485300.
Повний текст джерела(9751070), Vaibhav R. Ostwal. "SPINTRONIC DEVICES FROM CONVENTIONAL AND EMERGING 2D MATERIALS FOR PROBABILISTIC COMPUTING." Thesis, 2020.
Знайти повний текст джерелаNovel computational paradigms based on non-von Neumann architectures are being extensively explored for modern data-intensive applications and big-data problems. One direction in this context is to harness the intrinsic physics of spintronics devices for the implementation of nanoscale and low-power building blocks of such emerging computational systems. For example, a Probabilistic Spin Logic (PSL) that consists of networks of p-bits has been proposed for neuromorphic computing, Bayesian networks, and for solving optimization problems. In my work, I will discuss two types of device-components required for PSL: (i) p-bits mimicking binary stochastic neurons (BSN) and (ii) compound synapses for implementing weighted interconnects between p-bits. Furthermore, I will also show how the integration of recently discovered van der Waals ferromagnets in spintronics devices can reduce the current densities required by orders of magnitude, paving the way for future low-power spintronics devices.
First, a spin-device with input-output isolation and stable magnets capable of generating tunable random numbers, similar to a BSN, was demonstrated. In this device, spin-orbit torque pulses are used to initialize a nano-magnet with perpendicular magnetic anisotropy (PMA) along its hard axis. After removal of each pulse, the nano-magnet can relax back to either of its two stable states, generating a stream of binary random numbers. By applying a small Oersted field using the input terminal of the device, the probability of obtaining 0 or 1 in binary random numbers (P) can be tuned electrically. Furthermore, our work shows that in the case when two stochastic devices are connected in series, “P” of the second device is a function of “P” of the first p-bit and the weight of the interconnection between them. Such control over correlated probabilities of stochastic devices using interconnecting weights is the working principle of PSL.
Next my work focused on compact and energy efficient implementations of p-bits and interconnecting weights using modified spin-devices. It was shown that unstable in-plane magnetic tunneling junctions (MTJs), i.e. MTJs with a low energy barrier, naturally fluctuate between two states (parallel and anti-parallel) without any external excitation, in this way generating binary random numbers. Furthermore, spin-orbit torque of tantalum is used to control the time spent by the in-plane MTJ in either of its two states i.e. “P” of the device. In this device, the READ and WRITE paths are separated since the MTJ state is read by passing a current through the MTJ (READ path) while “P” is controlled by passing a current through the tantalum bar (WRITE path). Hence, a BSN/p-bit is implemented without energy-consuming hard axis initialization of the magnet and Oersted fields. Next, probabilistic switching of stable magnets was utilized to implement a novel compound synapse, which can be used for weighted interconnects between p-bits. In this experiment, an ensemble of nano-magnets was subjected to spin-orbit torque pulses such that each nano-magnet has a finite probability of switching. Hence, when a series of pulses are applied, the total magnetization of the ensemble gradually increases with the number of pulses
applied similar to the potentiation and depression curves of synapses. Furthermore, it was shown that a modified pulse scheme can improve the linearity of the synaptic behavior, which is desired for neuromorphic computing. By implementing both neuronal and synaptic devices using simple nano-magnets, we have shown that PSL can be realized using a modified Magnetic Random Access Memory (MRAM) technology. Note that MRAM technology exists in many current foundries.
To further reduce the current densities required for spin-torque devices, we have fabricated heterostructures consisting of a 2-dimensional semiconducting ferromagnet (Cr2Ge2Te6) and a metal with spin-orbit coupling metal (tantalum). Because of properties such as clean interfaces, perfect crystalline nanomagnet structure and sustained magnetic moments down to the mono-layer limit and low current shunting, 2D ferromagnets require orders of magnitude lower current densities for spin-orbit torque switching than conventional metallic ferromagnets such as CoFeB.
Книги з теми "040406 Magnetism and Palaeomagnetism"
Geissman, John William, M. H. Ort, and M. Porreca. The use of palaeomagnetism and rock magnetism to understand volcanic processes. London: The Geological Society, 2015.
Знайти повний текст джерелаI. Rockmagnetism, palaeomagnetism and environmental magnetism. Oxford, England: Pergamon, 1999.
Знайти повний текст джерелаCollinson, D. Methods in Rock Magnetism and Palaeomagnetism: Techniques And Instrumentation. Springer, 2013.
Знайти повний текст джерелаCollinson, D. Methods in Rock Magnetism and Palaeomagnetism: Techniques and Instrumentation. Springer, 2013.
Знайти повний текст джерелаЧастини книг з теми "040406 Magnetism and Palaeomagnetism"
Collinson, D. W. "The Magnetism of Ordinary Chondrites and SNC Meteorites: Possible Implications for Ancient Solar System Magnetic Fields." In Geomagnetism and Palaeomagnetism, 279–95. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0905-2_22.
Повний текст джерела"Palaeomagnetism and Mineral Magnetism." In Looking into the Earth, 139–61. Cambridge University Press, 2000. http://dx.doi.org/10.1017/cbo9780511810305.011.
Повний текст джерелаSTACEY, F. D. "The Measurement of Stress Effects in Rock Magnetism." In Methods in Palaeomagnetism, 589–92. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4832-2894-5.50094-x.
Повний текст джерелаCREER, K. M. "The Production of High Magnetic Fields for Experiments in Rock Magnetism." In Methods in Palaeomagnetism, 541–50. Elsevier, 2013. http://dx.doi.org/10.1016/b978-1-4832-2894-5.50091-4.
Повний текст джерелаLowrie, William. "7. The Earth’s magnetic field." In Geophysics: A Very Short Introduction, 106–26. Oxford University Press, 2018. http://dx.doi.org/10.1093/actrade/9780198792956.003.0007.
Повний текст джерела