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18 Jan 2010

Volume 96, Issue 3, Articles (03xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 96, 033101 (2010); http://dx.doi.org/10.1063/1.3291849 (3 pages)

Ferruccio Pisanello, Luigi Martiradonna, Godefroy Leménager, Piernicola Spinicelli, Angela Fiore, Liberato Manna, Jean-Pierre Hermier, Roberto Cingolani, Elisabeth Giacobino, Massimo De Vittorio, and Alberto Bramati
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Physical properties of La0.7Ba0.3MnO3−δ complex oxide thin films grown by pulsed laser deposition technique

P. Orgiani, R. Ciancio, A. Galdi, S. Amoruso, and L. Maritato

Appl. Phys. Lett. 96, 032501 (2010); http://dx.doi.org/10.1063/1.3292588 (3 pages) | Cited 4 times

Online Publication Date: 22 January 2010

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We report on transport properties of oxide manganite La0.7Ba0.3MnO3−δ (LBMO) thin films deposited by pulsed laser deposition (PLD) technique. Detailed analysis of heavy-ion stoichiometric composition has been carried out as a function of laser-pulse fluence and ambient oxygen pressure. Depositions using high-fluence (6 J/cm2) and low oxygen pressure (10−2 mbar) provide the optimal heavy-ion stoichiometric ratio in the LBMO samples. Deviations from the optimal LBMO stoichiometry are observed when decreasing the laser fluence or increasing the background oxygen pressure. This behavior is interpreted by considering the influence of the experimental deposition conditions on the plume dynamics. All these findings provide clear insights on the PLD-growth of manganites and, more in general, of complex oxide materials.
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73.61.Ng Insulators
72.60.+g Mixed conductivity and conductivity transitions
71.30.+h Metal-insulator transitions and other electronic transitions
68.55.aj Insulators
81.15.Fg Pulsed laser ablation deposition

Influence of length and measurement geometry on magnetoimpedance in La0.7Sr0.3MnO3

A. Rebello and R. Mahendiran

Appl. Phys. Lett. 96, 032502 (2010); http://dx.doi.org/10.1063/1.3293292 (3 pages) | Cited 3 times

Online Publication Date: 22 January 2010

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We show that ac magnetoresistance at room temperature in La0.7Sr0.3MnO3 is extremely high ( ≈ −47% in μ0H = 100 mT, f = 3–5 MHz), and magnetic field dependence of reactance exhibits a double peak behavior. However, magnitudes of the ac magnetoresistance and magnetoreactance for a fixed length of the sample (li) decrease with decreasing separation (lv) between voltage probes unlike the dc magnetoresistance. On the contrary, change in li has a negligible influence on magnetoimpedance when lv is fixed. Our results indicate that high frequency electrical transport is sensitive to local variations in the magnetic permeability.
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75.47.Lx Magnetic oxides
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
72.20.My Galvanomagnetic and other magnetotransport effects

Guided nucleation of superconductivity on a graded magnetic substrate

M. V. Milošević, W. Gillijns, A. V. Silhanek, A. Libál, F. M. Peeters, and V. V. Moshchalkov

Appl. Phys. Lett. 96, 032503 (2010); http://dx.doi.org/10.1063/1.3293300 (3 pages) | Cited 2 times

Online Publication Date: 22 January 2010

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We demonstrate the controlled spatial nucleation of superconductivity in a thin film deposited on periodic arrays of ferromagnetic dots with gradually increasing diameter. The perpendicular magnetization of the dots induces vortex-antivortex molecules in the sample, with the number of (anti)vortices increasing with magnet size. The resulting gradient of antivortex density between the dots predetermines local nucleation of superconductivity in the sample as a function of the applied external field and temperature. In addition, the compensation between the applied magnetic field and the antivortices results in an unprecedented enhancement of the critical temperature.
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74.78.-w Superconducting films and low-dimensional structures
74.25.Ha Magnetic properties including vortex structures and related phenomena
74.10.+v Occurrence, potential candidates
74.25.Wx Vortex pinning (includes mechanisms and flux creep)

Direct observation of high velocity current induced domain wall motion

L. Heyne, J. Rhensius, A. Bisig, S. Krzyk, P. Punke, M. Kläui, L. J. Heyderman, L. Le Guyader, and F. Nolting

Appl. Phys. Lett. 96, 032504 (2010); http://dx.doi.org/10.1063/1.3291067 (3 pages) | Cited 6 times

Online Publication Date: 22 January 2010

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We study fast vortex wall propagation in Permalloy wires induced by 3 ns short current pulses with sub 100 ps rise time using high resolution magnetic imaging at zero field. We find a constant domain wall displacement after each current pulse as well as current induced domain wall structure changes, even at these very short timescales. The domain wall velocities are found to be above 100 m/s and independent of the domain wall spin structure. Comparison to experiments with longer pulses points to the pulse shape as the origin of the high velocities.
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75.60.Ch Domain walls and domain structure
74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)

Magnetization reversal process in Fe/FePt films

Jai-Lin Tsai, Hsin-Te Tzeng, and Guo-Bin Lin

Appl. Phys. Lett. 96, 032505 (2010); http://dx.doi.org/10.1063/1.3293444 (3 pages) | Cited 8 times

Online Publication Date: 22 January 2010

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A soft/hard Fe/FePt bilayer with perpendicular magnetization was prepared on a glass substrate. Controlling the Fe layer thickness allowed modification of the hysteresis loops from rigid magnet with perpendicular magnetization to exchange-spring like magnet with parallel magnetization due to the nanoscale soft/hard interface coupling. For rigid magnetic films, the magnetization was reversed at a single switching field and interpreted by the two-spin model. In an exchange-spring like film, the in-plane magnetization reversal process was in two-steps and resulted from domain wall nucleation and propagation from the Fe layer into the FePt layer.
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75.60.Jk Magnetization reversal mechanisms
75.50.Ss Magnetic recording materials
75.30.Et Exchange and superexchange interactions
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.70.Kw Domain structure (including magnetic bubbles and vortices)
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