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11 Oct 2010

Volume 97, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 97, 154101 (2010); http://dx.doi.org/10.1063/1.3479052 (3 pages)

Younggeun Park, Yeonho Choi, Debkishore Mitra, Taewook Kang, and Luke P. Lee
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Reduction of low-frequency 1/f noise in Al–AlOx–Al tunnel junctions by thermal annealing

J. K. Julin, P. J. Koppinen, and I. J. Maasilta

Appl. Phys. Lett. 97, 152501 (2010); http://dx.doi.org/10.1063/1.3500823 (3 pages) | Cited 5 times

Online Publication Date: 11 October 2010

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We report that annealing Al–AlOx–Al tunnel junctions in a vacuum chamber at temperature of 400 °C reduces the characteristic 1/f noise in the junctions, in some cases by an order of magnitude. Both ultrahigh vacuum and high vacuum fabricated samples demonstrated a significant reduction in the 1/f noise level. Temperature dependence of the noise was studied between 4.2 and 340 K, with a linear dependence below 100 K, but a faster increase above. The results are consistent with a model where the density of charge trapping two level-systems within the tunneling barrier is reduced by the annealing process.
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72.70.+m Noise processes and phenomena
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
73.40.Gk Tunneling

Mapping of localized spin-wave excitations by near-field Brillouin light scattering

J. Jersch, V. E. Demidov, H. Fuchs, K. Rott, P. Krzysteczko, J. Münchenberger, G. Reiss, and S. O. Demokritov

Appl. Phys. Lett. 97, 152502 (2010); http://dx.doi.org/10.1063/1.3502599 (3 pages) | Cited 8 times

Online Publication Date: 13 October 2010

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We report on the experimental study of the spatial characteristics of high-frequency spin-wave modes localized at the edges of micrometer-size in-plane magnetized permalloy ellipses. Using a near-field Brillouin light scattering technique, we have mapped the modes with the spatial resolution of few tens of nanometers. We show that the width of the localization area strongly depends on the applied magnetic field and reduces to about 85 nm for high fields. We also demonstrate that the existing theoretical models do not appropriately describe spatial characteristics of the modes.
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75.75.-c Magnetic properties of nanostructures
75.30.Ds Spin waves
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.50.Bb Fe and its alloys
75.50.Tt Fine-particle systems; nanocrystalline materials
78.35.+c Brillouin and Rayleigh scattering; other light scattering

Low damping resonant magnetoelectric sensors

Henry Greve, Eric Woltermann, Robert Jahns, Stephan Marauska, Bernhard Wagner, Reinhard Knöchel, Manfred Wuttig, and Eckhard Quandt

Appl. Phys. Lett. 97, 152503 (2010); http://dx.doi.org/10.1063/1.3497277 (3 pages) | Cited 21 times

Online Publication Date: 13 October 2010

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The signal of magnetic sensors based on resonant cantilevers comprised of elastically coupled piezoelectric and magnetostrictive materials increases as the damping decreases. Here, we demonstrate that air damping which normally is suppressed by evacuation can also be substantially reduced by lowering the resonance frequency. We show that a Si-cantilever structured to include a seismic mass features a resonant magnetoelectric coupling coefficient of 1.8 kV/cmOe at 330 Hz in air.
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07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
85.70.Ec Magnetostrictive, magnetoacoustic, and magnetostatic devices
07.55.-w Magnetic instruments and components

Direct communication between magnetic tunnel junctions for nonvolatile logic fan-out architecture

Andrew Lyle, Jonathan Harms, Shruti Patil, Xiaofeng Yao, David J. Lilja, and Jian-Ping Wang

Appl. Phys. Lett. 97, 152504 (2010); http://dx.doi.org/10.1063/1.3499427 (3 pages)

Online Publication Date: 14 October 2010

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We experimentally demonstrated a magnetic tunnel junction (MTJ) based circuit that allows direct communication between elements without intermediate sensing amplifiers. The input of the circuit consists of three MTJs connected in parallel. The direct communication is realized by connecting the output in series with the input and applying voltage across the series connections. Combining the circuit with complementary metal oxide semiconductor current mirrors allows for fan-out to multiple outputs. The change in resistance at the input resulted in a voltage swing across the output of 150–200 mV for the closest input states which is sufficient to realize all of the Boolean primitives.
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85.75.Ff Reprogrammable magnetic logic
84.30.Sk Pulse and digital circuits
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