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14 Sep 2009

Volume 95, Issue 11, Articles (11xxxx)

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Appl. Phys. Lett. 95, 113101 (2009); http://dx.doi.org/10.1063/1.3197646 (3 pages)

Jesse J. Cole, En-Chiang Lin, Chad R. Barry, and Heiko O. Jacobs
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Structural and magnetic phenomena in Ni53Mn25Al22 thin film prepared by rf magnetron sputtering

Vijay Kumar Srivastava, Saurabh Kumar Srivastava, Ratnamala Chatterjee, Govind Gupta, S. M. Shivprasad, and A. K. Nigam

Appl. Phys. Lett. 95, 114101 (2009); http://dx.doi.org/10.1063/1.3222940 (3 pages) | Cited 1 time

Online Publication Date: 16 September 2009

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Magnetic and structural properties of Ni–Mn–Al thin films are investigated. It is demonstrated that the annealed film shows L21 phase at room temperature. Magnetometry measurements reveal that the annealed film is ferromagnetic and a first order transition in magnetization versus temperature measurement confirms that the martensite to austenite transition occurs around room temperature. Transmission electron microscopy measurements confirm that this structural change occurs just below room temperature. The splitting of Mn 2p3/2 level in x-ray photoelectron spectroscopy core level spectra of the annealed Ni–Mn–Al film, confirms that the origin of magnetism is definitely correlated with the local magnetic moment at the Mn atoms.
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75.70.Ak Magnetic properties of monolayers and thin films
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.30.Cr Saturation moments and magnetic susceptibilities
81.15.Cd Deposition by sputtering
79.60.Dp Adsorbed layers and thin films
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Temperature-dependent luminescence of Ce3+ in gallium-substituted garnets

Rachael A. Hansel, S. W. Allison, and D. G. Walker

Appl. Phys. Lett. 95, 114102 (2009); http://dx.doi.org/10.1063/1.3216583 (2 pages) | Cited 9 times

Online Publication Date: 16 September 2009

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The luminescent lifetime of cerium-doped yttrium aluminum garnet has been determined as a function of temperature and as a function of gallium content. We have shown that increasing gallium content decreases the decay lifetime and results in luminescence quenching at lower temperatures. The results are quantitatively explained using a configurational coordinate diagram.
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78.55.Hx Other solid inorganic materials
61.72.up Other materials
75.50.Gg Ferrimagnetics

Sensor based on extending the concept of fidelity to classical waves

Biniyam Tesfaye Taddese, James Hart, Thomas M. Antonsen, Edward Ott, and Steven M. Anlage

Appl. Phys. Lett. 95, 114103 (2009); http://dx.doi.org/10.1063/1.3232214 (3 pages) | Cited 5 times

Online Publication Date: 18 September 2009

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We propose and demonstrate a remote sensor scheme by applying the quantum mechanical concept of fidelity loss to classical waves. The sensor makes explicit use of time-reversal invariance and spatial reciprocity in a wave chaotic system to sensitively and remotely measure the presence of small perturbations. The loss of fidelity is measured through a classical wave analog of the Loschmidt echo by employing a single-channel time-reversal mirror to rebroadcast a probe signal into the perturbed system. We also introduce the use of exponential amplification of the probe signal to partially overcome the effects of propagation losses and to vary the sensitivity.
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07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
43.28.We Measurement methods and instrumentation for remote sensing and for inverse problems
43.25.Cb Macrosonic propagation, finite amplitude sound; shock waves

Left-handed behavior and low-loss passband in a ferromagnetic sandwich structure

Fang Xu, Yang Bai, Lijie Qiao, Hongjie Zhao, and Ji Zhou

Appl. Phys. Lett. 95, 114104 (2009); http://dx.doi.org/10.1063/1.3233899 (3 pages) | Cited 3 times

Online Publication Date: 18 September 2009

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The electromagnetic properties of a ferromagnetic-dielectric-ferromagnetic sandwich structure were studied by experiment and simulation. In the transmission spectra, an obvious passband emerges in the broad forbidden band of ferromagnetic resonance because the strong coupling of two resonating ferrite slabs excites a propagating mode. The passband has ultralow loss ( ∼ −1 dB) due to the feature of surface wave and the bias magnetic field pump. A negative phase evolution of propagating wave occurs in the second slab only based on the magnetic resonance. The ultralow insertion loss of passband and magnetotunability endow the sandwich structure a promising application future.
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76.50.+g Ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance
42.70.-a Optical materials
71.20.-b Electron density of states and band structure of crystalline solids
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Gg Ferrimagnetics
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
77.22.Ch Permittivity (dielectric function)

Tunable optofluidic switch via hydrodynamic control of laminar flow rate

Y. C. Seow, S. P. Lim, and H. P. Lee

Appl. Phys. Lett. 95, 114105 (2009); http://dx.doi.org/10.1063/1.3229887 (3 pages) | Cited 10 times

Online Publication Date: 18 September 2009

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This letter reports a tunable planar optofluidic switch as illustrated by three laminar flow streams introduced into a focusing chamber. Different width of liquid core can be tuned via the imposed flow rate of these three laminar flow streams. The hydrodynamic tunability of the core-cladding interfaces is the key to realize microscale optical switching via total internal reflection. The optical switching capability is demonstrated having good agreement with optical simulations. The optofluidic optical switch can achieve a switching speed of 1.56 Hz and beyond with the potential for a seamless integration with other lab-on-a-chip devices for optical sensing applications.
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85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
47.85.Np Fluidics
42.79.Ta Optical computers, logic elements, interconnects, switches; neural networks
47.15.-x Laminar flows
47.85.L- Flow control
47.61.Fg Flows in micro-electromechanical systems (MEMS) and nano-electromechanical systems (NEMS)
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