Bulletin of the American Physical Society
9th Annual Meeting of the Northwest Section of the APS
Volume 52, Number 6
Thursday–Saturday, May 17–19, 2007; Pocatello, Idaho
Session E2: Condensed Matter Physics II |
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Chair: Chris Berven, University of Idaho Room: PSUB Bear River Room |
Saturday, May 19, 2007 2:00PM - 2:36PM |
E2.00001: Surface Plasmon Optical Transmission Sensors Invited Speaker: |
Saturday, May 19, 2007 2:36PM - 3:12PM |
E2.00002: Impurity-controlled valence, spin, and orbital state in Sr3Ru2O7. Invited Speaker: |
Saturday, May 19, 2007 3:12PM - 3:30PM |
E2.00003: Coffee Break
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Saturday, May 19, 2007 3:30PM - 3:42PM |
E2.00004: Ultra-soft Magnetic Thin Films Deposited by Obliquely Energetic Fe Nanoclusters Daniel Meyer, M. Faheem, Amit Sharma, Alan Mcconnaughery, Jamie Hass, Ryan Souza, You Qiang We have generated magnetically ultra-soft films by energetic cluster impact. The charged nanoclusters ($\sim $ 40{\%} of all particles) were accelerated onto substrates held at potentials of 0, 5, and 15 kV. The substrates were tilted at an angle of 30 degrees to the incident beam to generate elliptically shaped particles and thereby induce shape anisotropy. Visible changes of the film structure were observed for increasing potential with 0 kV sample being black due to the porous nature of the soft landed clusters. For the 5 and 15 kV samples, the films take on a metallic sheen due to the increased density. Dramatic magnetic softening of the films was observed for samples with applied potentials, and hence higher packing fractions, in agreement with the random anisotropy model. The coercivity (Hc) at 0 kV was measured to be 78 Oe. Along the easy axis the Hc of the 5 and 15 kV samples were 0.497 and 0.651 Oe respectively. Along the hard axis the Hc were 2.06 and 2.46 Oe. The Hc perpendicular to the substrates was 9.86 and 6.7 Oe. Hence, definite shape anisotropy is observed for the 5 and 15 kV samples with approximately a 70{\%} increase in coercivity of the hard axis relative to the easy axis. In this experiment we have demonstrated a novel technique for directly controlling film morphology and thereby ability to tailor magnetic characteristics for applications in high frequency inductors. [Preview Abstract] |
Saturday, May 19, 2007 3:42PM - 3:54PM |
E2.00005: Algorithms for the Control of Low Dimensional Chaos in the presence of System Parameter Drift Thomas Olsen, Kjell Schroder, Katherine Carriker, Bonita Squires, Kara Yedinak, Richard Wiener The chaotic formation of Taylor-Vortex pairs in Modified Taylor- Couette flow with hourglass geometry may be controlled by the application of Recursive Proportional Feedback algorithm\footnote{Rollins \textit{et al}, Phys. Rev. E \textbf{47}, R780 (1993).}$^{,}$\footnote{Wiener \textit{et al}, Phys. Rev. Lett. \textbf{83}, 2340 (1999).}. We consider other algorithms that might be effective in the same context. We continue our studies of their effectiveness. We present numerical simulations and analysis to determine the stability and robustness of these new algorithms as the parameters that define the system drift. [Preview Abstract] |
Saturday, May 19, 2007 3:54PM - 4:06PM |
E2.00006: Spin propagation in vacuum and in two-dimensional electronic systems Jean-Francois Van Huele, Bailey Hsu The spin degree of freedom is an important tool to understand and manipulate the complexity of quantum systems. It is also a physical system that is evolving in space and time and gives rise to spin currents that may or may not be associated with the dynamics of electromagnetic particles. We review the ways at our disposal to describe and analyze space-time evolution of single and multiple spins in electromagnetic fields that are either externally applied in vacuum or that are generated in confined environments through spin-orbit couplings. [Preview Abstract] |
Saturday, May 19, 2007 4:06PM - 4:18PM |
E2.00007: Spin-Orbit Mediated Anisotropic Spin-Spin Coupling Suhas Gangadharaiah, Jianmin Sun, Oleg Starykh We study spin-spin interaction between electrons localized in spatially separated quantum dots. We show that in the presence of single electron spin-orbit interaction (of Rashba type) in the dots and Coulomb interactions between electrons, a new anisotropic coupling between spins emerges. Unlike the standard exchange this coupling does not require overlap of the wavefunctions, and as a result becomes dominant for large distance between the dots. [Preview Abstract] |
Saturday, May 19, 2007 4:18PM - 4:30PM |
E2.00008: Spin-orbit induced spin-density wave in a quantum wire Jianmin Sun, suhas Gangadharaiah, Oleg Starykh We study an interacting quantum wire in the presence of magnetic field and spin-orbit interaction.We show that in weak spin-orbit and strong magnetic field,the spin-density wave(SDW) state is stabilized when the magnetic field and spin-orbit axes are orthogonal.The spin ordering takes place along the direction of spin-orbit axis and perpendicular to the magnetic field. We next analyze charge transport in the presence of single weak impurity. We find with the SDW state stabilized single particle backscattering off a nonmagnetic impurity becomes irrelevant. The sensitivity of the SDW state, and hence the charge transport, to the mutual orientation and magnitude of the magnetic and spin-orbit terms can be used for the experimental verification of this novel spin- orbit mediated state. [Preview Abstract] |
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