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      Hybrid spintronics and straintronics: A magnetic technology for ultra low energy computing and signal processing

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          Abstract

          The authors show that the magnetization of a magnetostrictive/piezoelectric multiferroic single-domain shape-anisotropic nanomagnet can be switched with very small voltages that generate strain in the magnetostrictive layer. This can be the basis of ultralow power computing and signal processing. With appropriate material choice, the energy dissipated per switching event can be reduced to 45 kT at room temperature for a switching delay of 100 ns and 70 kT for a switching delay of 10 ns, if the energy barrier separating the two stable magnetization directions is 32 kT. Such devices can be powered by harvesting energy exclusively from the environment without the need for a battery.

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          Intrinsic and non-local Gilbert damping in polycrystalline nickel studied by Ti:Sapphire laser fs spectroscopy

          The use of femtosecond laser pulses generated by a Ti:Sapphire laser system allows us to gain an insight into the magnetization dynamics on time scales from sub-picosecond up to 1 ns directly in the time domain. This experimental technique is used to excite a polycrystalline nickel (Ni) film optically and probe the dynamics afterwards. Different spin wave modes (the Kittel mode, perpendicular standing spin-wave modes (PSSW) and dipolar spin-wave modes (Damon-Eshbach modes)) are identified as the Ni thickness is increased. The Kittel mode allows determination of the Gilbert damping parameter alpha extracted from the magnetization relaxation time tau_alpha. The non-local damping by spin currents emitted into a non-magnetic metallic layer of vanadium (V), palladium (Pd) and the rare earth dysprosium (Dy) are studied for wedge-shaped Ni films 1 nm-30 nm. The damping parameter increases from alpha=0.045 intrinsic for nickel to alpha>0.10 for the heavy materials, such as Pd and Dy, for the thinnest Ni films below 10 nm thickness. Also, for the thinnest reference Ni film thickness, an increased magnetic damping below 4 nm is observed. The origin of this increase is discussed within the framework of line broadening by locally different precessional frequencies within the laser spot region.
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            Anomalous thermal expansion and magnetostriction of single crystal Tb<inf>.27</inf>Dy<inf>.73</inf>Fe<inf>2</inf>

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              Experimental Investigation of Terfenol-D's Elastic Modulus

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                Author and article information

                Journal
                11 January 2011
                Article
                10.1063/1.3624900
                1101.2222
                7584ed55-f1cc-485d-8a48-2f9194dcf12b

                http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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                Custom metadata
                Appl. Phys. Lett., 99, 063108 (2011)
                cond-mat.mes-hall

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