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Displaying records 21 to 30 of 42 records.
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21. Observations and modeling of normal-metal/insulator/superconductor refrigerator cooling from 300 mK to below 100 mK
Topic: Condensed Matter Physics
Published: Date unknown
Authors: Galen C O\'Neil, Peter J Lowell, Joel Nathan Ullom, Jason M Underwood
Abstract: In a refrigerator, heat is moved from one system to another and this movement requires an additional dissipated power. It is desirable to both isolate the cooled system, so that its temperature may differ from the bath, and to heatsink the heated sys ...

22. Origin of Universal Optical Conductivity and Optical Stacking Sequence Identification in Multilayer Graphene
Topic: Condensed Matter Physics
Published: 8/6/2009
Authors: Hongki Min, Allan H. MacDonald
Abstract: We predict that the optical conductivity of normal graphene multilayers is close to {sigma}^duni^=({pi}/2) e^u2^/h per layer over a broad range of frequencies. The origin of this behavior is an emergent chiral symmetry which is present in normal N-l ...

23. Parametric pumping of precession modes in ferromagnetic nanodisks
Topic: Condensed Matter Physics
Published: 3/26/2014
Authors: Feng Guo, Lyubov Belova, Robert D McMichael
Abstract: We report parametric excitation of magnetic precession modes in nanodisks using a parallel pumping configuration. The excitations are detected using a ferromagneitc resonance force microscopy method, and the parallel-pumped spectra reveal nonlinear c ...

24. Perspective on Probing Metallic Ferromagnetism with Electrons
Topic: Condensed Matter Physics
Published: 3/21/2011
Author: Daniel Thornton Pierce
Abstract: This article presents a brief review of some of the many insights gained about metallic ferromagnetism using spin-polarized electrons as probes. Aspects of metallic ferromagnetism discussed include spin-dependent electronic structure, spin-dependent ...

25. Propagation and control of nano-scale, magnetic droplet solitons
Topic: Condensed Matter Physics
Published: 6/11/2012
Authors: Thomas J Silva, Mark Hoefer, Matteo Sommacal
Abstract: The propagation and controlled manipulation of strongly nonlinear, two-dimensional solitonic states in a thin, anisotropic ferromagnet is theoretically demonstrated. It has been recently proposed that spin polarized currents in a nanocontact device c ...

26. Properties of magnetic barrier structures for superconducting-magnetic hybrid Josephson junctions
Topic: Condensed Matter Physics
Published: 7/7/2013
Authors: Burm Baek, Samuel Paul Benz, William H Rippard, Stephen E Russek, Paul David Dresselhaus, Horst Rogalla, Matthew R Pufall
Abstract: If Josephson and spintronic technologies can be successfully integrated to produce a cryogenic memory that can be controlled with single-flux quantum pulses, then they may enable ultra-low-power, high-speed computing. We have developed hybrid Josephs ...

27. Reply to "Comment on: 'Ultrafast Demagnetization Measurements Using Extreme Ultraviolet Light: Comparison of Electronic and Magnetic Contributions'Š
Topic: Condensed Matter Physics
Published: 9/4/2013
Authors: Justin M Shaw, Thomas J Silva, Hans Toya Nembach, Emrah Turgut, Patrik Grychtol, Chan La-O-Vorakiat, Henry Kapteyn, Margaret M. Murnane, Stefan Mathias, Martin Aeschlimann, Claus Schneider, Daniel E. Adams
Abstract: In the following, we show that the conclusions of our article titled "Ultrafast Demagnetization Measurements Using Extreme Ultraviolet Light: Comparison of Electronic and Magnetic Contributions" are correct. The Comment of Vodungbo {I}et al.{/I} arg ...

28. Shear Thinning Near the Critical Point of Xenon
Topic: Condensed Matter Physics
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...

29. Spin transport parameters in metallic multilayers determined by ferromagnetic resonance measurements of spin-pumping
Topic: Condensed Matter Physics
Published: 4/19/2013
Authors: Carl T. Boone, Hans Toya Nembach, Justin M Shaw, Thomas J Silva
Abstract: We measured spin-transport in nonferromagnetic (NM) metallic multilayers from the contribution to damping due to spin pumping from a ferromagnetic Co^d90^Fe^d10^ thin film. The multilayer stack consisted of NM^d1^/NM^d2^/Co^d90^Fe^d10^(2 nm)/NM^d2^/N ...

30. Spin-Transfer Nano-Oscillators
Topic: Condensed Matter Physics
Published: 1/7/2013
Authors: Stephen E Russek, Ranko R. Heindl, Thomas Cecil, William H Rippard
Abstract: Spin transfer nano-oscillators are small multilayer magnetic devices that undergo microwave oscillations and output a microwave voltage when a bias current is applied. The oscillation frequency is tunable, over a range of 0.5 GHz to 225 GHz, by vary ...

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