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You searched on: Topic Area: Condensed Matter Physics

Displaying records 1 to 10 of 44 records.
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1. Radiative damping in wave guide based FMR measured via analysis of perpendicular standing spin waves in sputtered Permalloy films
Topic: Condensed Matter Physics
Published: 11/17/2015
Authors: Thomas J Silva, Justin M Shaw, Hans Toya Nembach, Mathias Weiler, Martin Schoen
Abstract: The damping α of the spinwave resonances in 75 nm, 120 nm, and 200 nm -thick Permalloy films is measured via vector-network- analyzer ferromagnetic-resonance (VNA-FMR). Inductive coupling between the sample and the waveguide leads to an addition ...

2. Controlling the electronic structure of graphene using surface-adsorbate interactions
Topic: Condensed Matter Physics
Published: 7/21/2015
Authors: Piotr Matyba, Adra V. Carr, Cong Chen, David L. Miller, Thomas Orlando, Stefan Mathias, Mark W Keller, Henry C. Kapteyn, Margaret M. Murnane
Abstract: Hybridization of atomic orbitals in graphene on Ni(111) opens up a large energy gap of ≈2.8 eV between nonhybridized states at the K point. Here we use alkali-metal adsorbate to reduce and even eliminate this energy gap, and also identify a new ...

3. Spin-scattering rates in metallic thin films measured by ferromagnetic resonance damping enhanced by spin-pumping
Topic: Condensed Matter Physics
Published: 6/12/2015
Authors: Carl T. Boone, Justin M Shaw, Hans Toya Nembach, Thomas J Silva
Abstract: We determined the spin-transport properties of Pd and Pt thin films by measuring the increase in ferromagnetic resonance damping due to spin-pumping in ferromagnetic (FM)-nonferromagnetic metal (NM) multilayers with varying NM thicknesses. The increa ...

4. Tunable Spin Qubit Coupling Mediated by a Multi-Electron Quantum Dot
Topic: Condensed Matter Physics
Published: 6/4/2015
Authors: Vanita Srinivasa, Haitan Xu, Jacob M Taylor
Abstract: We present an approach for entangling electron spin qubits localized on spatially separated impurity atoms or quantum dots via a multi-electron, two-level quantum dot. The effective exchange interaction mediated by the dot can be understood as the si ...

5. Molecular dynamics simulation of thermal ripples in graphene with bond-order-informed harmonic constraints
Topic: Condensed Matter Physics
Published: 11/7/2014
Author: Alexander Y Smolyanitsky
Abstract: We describe the results of atomistic molecular dynamics simulations of thermal rippling in graphene, obtained with a simple, low computational cost, harmonic constraint model. The constraint stiffness values are calculated directly from the bond ...

6. 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 ...

7. Comment on ŠDetection of Microwave Spin Pumping Using the Inverse Spin Hall EffectŠ
Topic: Condensed Matter Physics
Published: 1/27/2014
Authors: Thomas J Silva, Mathias A. Weiler, Hans Toya Nembach, Justin M Shaw
Abstract: In a recent Letter, Hahn et al. reported on the detection of an ac voltage in a yttrium iron garnet (YIG)/platinum (Pt) bilayer under the condition of parametrically excited resonance. The authors observe an ac voltage at the frequency of the magneti ...

8. 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 ...

9. Giant Secondary Grain Growth in Cu Films on Sapphire
Topic: Condensed Matter Physics
Published: 8/1/2013
Authors: David L. Miller, Mark W Keller, Justin M Shaw, Katherine P. Rice, Robert R Keller, Kyle M. Diederichsen
Abstract: Single crystal metal films on insulating substrates are attractive for microelectronics and other applications, but they are difficult to achieve on macroscopic length scales. The conventional approach to obtaining such films is epitaxial growth at h ...

10. 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 ...

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