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Displaying records 31 to 40 of 111 records.
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31. Non-white frequency noise in spin torque oscillators and its effect on spectral linewidth
Topic: Condensed Matter Physics
Published: 8/1/2010
Authors: Mark W Keller, Matthew R Pufall, William H Rippard, Thomas J Silva
Abstract: We measure the power spectral density of frequency fluctuations from the output voltage waveform of nanocontact spin torque oscillators over timescales up to 50 ms. We facilitate digitization of the waveform by using a mixer to convert oscillator sig ...

32. Band Structure of ABC-Stacked Graphene Trilayers
Topic: Condensed Matter Physics
Published: 7/9/2010
Authors: Fan Zhang, Bhagawan Sahu, Hongki Min, Allan H. MacDonald
Abstract: The ABC-stacked N-layer-graphene family of two-dimensional electron systems is described at low energies by two remarkably flat bands with Bloch states that have strongly momentum-dependent phase differences between carbon \pi-orbital amplitudes on ...

33. Observation of Transparency of Erbium-doped Silicon nitride in photonic crystal nanobeam cavities
Topic: Condensed Matter Physics
Published: 6/14/2010
Authors: Yiyang Gong, Maria Makarova, Selcuk Yerci, Rui Li, Martin J Stevens, Burm Baek, Sae Woo Nam, Luca Dal Negro, Jelena Vuckovic
Abstract: One dimensional nanobeam photonic crystal cavities are fabricated in an Er-doped amorphous silicon nitride layer. Photoluminescence from the cavities around 1.54 mm is studied at cryogenic and room temperatures at different optical pump powers. The ...

34. Effects of disorder and internal dynamics on vortex wall propagation
Topic: Condensed Matter Physics
Published: 5/26/2010
Authors: Hongki Min, Robert D McMichael, Michael J Donahue, Jacques Miltat, Mark D Stiles
Abstract: Experimental measurements of domain wall propagation are typically interpreted by comparison to ideal models that ignore the effects of extrinsic disorder and the internal dynamics of domain wall structures. Using micromagnetic simulations we study v ...

35. Modification of edge mode dynamics of oxidized Ni^d80^Fe^d20^ thin film edges
Topic: Condensed Matter Physics
Published: 5/20/2010
Authors: Meng Zhu, Robert D McMichael
Abstract: We use ''edge mode'' ferromagnetic resonance (FMR) to probe the magentic properties of oxidized Ni^d80^Fe^d20^ (Py) nanostripe edges. The oxidation is carried out using either oxygen plasma or thermal annealing in an oxygen ambient ...

36. Density functional theory study of clean, hydrated, and defective alumina (1-102) surfaces
Topic: Condensed Matter Physics
Published: 4/1/2010
Authors: Sara E. Mason, Christopher R. Iceman, Thomas P. Trainor, Anne Marie Chaka
Abstract: We report an ab initio thermodynamic analysis of the a-Al2O3 (1-102) surface aimed at understanding the experimentally observed terminations over a range of surface preparation conditions, as well as a novel stoichiometric model for the (2x1) surface ...

37. Characterization of Soluble Anthradithiophene Derivatives
Topic: Condensed Matter Physics
Published: 3/18/2010
Authors: Brad Conrad, Calvin Chan, Marsha A. Loth, John E Anthony, David J Gundlach
Abstract: We will discuss the growth and electrical measurements of a newly developed, partially fluorinated anthradithiophene (F-ADT) derivative with tert-butyldiphenylsilyl (TBDMS) side groups. Single crystals of the material can be readily grown and device ...

38. Optimization of spin-valve parameters for magnetic bead trapping and manipulation
Topic: Condensed Matter Physics
Published: 2/6/2010
Authors: Wendy R. Altman, John M Moreland, Stephen E Russek, Victor M. Bright
Abstract: Magneto-optic Kerr effect (MOKE) and magnetoresistance (MR) measurements were used to measure the switching characteristics of spin-valve (SV) arrays currently being developed to trap and release superparamagnetic beads within a fluid medium. The eff ...

39. Spin-transfer dynamics in spin valves with out-of-plane magnetized CoNi free layers
Topic: Condensed Matter Physics
Published: 1/29/2010
Authors: William H Rippard, Alina M Deac, Matthew R Pufall, Justin M Shaw, Mark W Keller, Stephen E Russek, Gerrit E Bauer, Claudio Serpico
Abstract: We have measured spin-transfer-induced dynamics in magnetic nanocontact devices having a perpendicularly magnetized Co/Ni free layer and an in-plane magnetized CoFe fixed layer. The frequencies and powers of the excitations agree well with the predic ...

40. Phase Diagram of Magnetic Nanodisks measured by SEMPA
Topic: Condensed Matter Physics
Published: 1/20/2010
Authors: Seok-Hwan Chung, Robert D McMichael, Daniel Thornton Pierce, John Unguris
Abstract: We use Scanning Electron Microscopy with Polarization Analysis (SEMPA) to image the magnetic domain structures of individual ferromagnetic nanodisks with different diameters and thicknesses, and thereby determine the phase diagram of the magnetic gro ...

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