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21 Dec 2009

Volume 95, Issue 25, Articles (25xxxx)

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Appl. Phys. Lett. 95, 251105 (2009); http://dx.doi.org/10.1063/1.3275666 (3 pages)

D. Stehr, C. M. Morris, D. Talbayev, M. Wagner, H. C. Kim, A. J. Taylor, H. Schneider, P. M. Petroff, and M. S. Sherwin
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Vortex domain wall chirality rectification due to the interaction with end domain spin structures in permalloy nanowires

E.-S. Wilhelm, D. McGrouther, L. Heyne, A. Bisig, and M. Kläui

Appl. Phys. Lett. 95, 252501 (2009); http://dx.doi.org/10.1063/1.3275576 (3 pages) | Cited 3 times

Online Publication Date: 21 December 2009

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The interaction of vortex domain walls with the end domain spin structure present at the rectangular end of a ferromagnetic nanowire is investigated using Lorentz transmission electron microscopy. When vortex walls are moved with short field pulses towards the wire end an end vortex is formed, whose chirality is independent of the original vortex wall chirality but is determined by the spin configuration of the end domain. This acts as a domain wall chirality “rectifier,” which could be useful for applications based on domain walls. The observed chirality transformations are reproduced by micromagnetic simulations showing a complex reversal mechanism.
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75.60.Ch Domain walls and domain structure
75.50.Bb Fe and its alloys
75.60.Jk Magnetization reversal mechanisms
61.46.Km Structure of nanowires and nanorods (long, free or loosely attached, quantum wires and quantum rods, but not gate-isolated embedded quantum wires)
75.78.Cd Micromagnetic simulations

The influence of the antiferromagnetic boundary on the magnetic property of La2NiMnO6

Xianjie Wang, Yu Sui, Yao Li, Lu Li, Xingquan Zhang, Yang Wang, Zhiguo Liu, Wenhui Su, and Jinke Tang

Appl. Phys. Lett. 95, 252502 (2009); http://dx.doi.org/10.1063/1.3267053 (3 pages) | Cited 4 times

Online Publication Date: 21 December 2009

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Polycrystalline La2NiMnO6 compounds were fabricated at different temperatures and their magnetic properties were investigated. Although the antiferromagnetic antisite disorder degree changes a little, the antiferromagnetic coupling intensity increases with increasing synthesized temperature. When La2NiMnO6 sample was cooled at 100 Oe from room temperature to 10 K, exchange bias was observed. Our results confirm that the exchange bias should originate from the coupling between the ferromagnetic La2NiMnO6 and antiferromagnetic antiphase boundaries.
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75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Pp Magnetic semiconductors
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
61.72.J- Point defects and defect clusters
75.50.Dd Nonmetallic ferromagnetic materials
75.50.Ee Antiferromagnetics

High magnetic field matching effects in NbN films induced by template grown dense ferromagnetic nanowires arrays

X. Hallet, M. Mátéfi-Tempfli, S. Michotte, L. Piraux, J. Vanacken, V. V. Moshchalkov, and S. Mátéfi-Tempfli

Appl. Phys. Lett. 95, 252503 (2009); http://dx.doi.org/10.1063/1.3276557 (3 pages) | Cited 5 times

Online Publication Date: 22 December 2009

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Dense arrays of ordered ferromagnetic nanowires have been used to create periodic magnetic pinning centers in thin superconducting NbN films. The nanowires were electrodeposited in a highly ordered porous alumina membrane and the thin NbN film was deposited on top of the perpendicularly oriented magnetic nanowires. Matching effects have been observed up to 2.5 T (11th matching field) and are maintained at low temperature. An appreciable enhancement of the superconducting properties is observed. At low fields, a hysteretic behavior in the magnetoresistance is found, directly related to the magnetization processes of arrays of interacting single domain ferromagnetic nanowires.
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74.25.Ha Magnetic properties including vortex structures and related phenomena
74.25.fc Electric and thermal conductivity
74.78.-w Superconducting films and low-dimensional structures
75.50.Tt Fine-particle systems; nanocrystalline materials
75.60.Ch Domain walls and domain structure
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects

Reducing extrinsic hysteresis in first-order La(Fe,Co,Si)13 magnetocaloric systems

J. D. Moore, K. Morrison, K. G. Sandeman, M. Katter, and L. F. Cohen

Appl. Phys. Lett. 95, 252504 (2009); http://dx.doi.org/10.1063/1.3276565 (3 pages) | Cited 12 times

Online Publication Date: 23 December 2009

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Simultaneous magnetization and sample temperature measurements were performed as a function of magnetic field and magnetic field sweep-rates to study the influence of these conditions on the hysteresis of the magnetocaloric transition in La(Fe1−x−yCoxSiy)13 samples. The large magnetocaloric effect in the compounds that show a first-order transition cause a significant departure from isothermal conditions leading to dynamic sweep-rate dependent magnetic hysteresis. Here we show how this deleterious effect can be greatly reduced by changing the sample geometry or by use of materials which show a second-order transition only. The key signatures of nonisothermal conditions in the magnetization data are highlighted.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

The radio-frequency impedance of individual intrinsic Josephson junctions

Johannes Leiner, Sajid Saleem, J. C. Fenton, Takashi Yamamoto, Kazuo Kadowaki, and P. A. Warburton

Appl. Phys. Lett. 95, 252505 (2009); http://dx.doi.org/10.1063/1.3275741 (3 pages) | Cited 1 time

Online Publication Date: 23 December 2009

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We have measured the response of an array of Bi2Sr2CaCu2O8+δ intrinsic Josephson junctions to irradiation at 3 GHz. By measuring the dependence of the switching current upon the radio-frequency current for five of the junctions in the array we show quantitatively that the junctions have identical impedances at 3 GHz, this impedance being given by the inverse of the slope of the current-voltage characteristics.
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74.50.+r Tunneling phenomena; Josephson effects
74.72.-h Cuprate superconductors
61.82.Ms Insulators

Si segregation in polycrystalline Co2MnSi films with grain-size control

A. Hirohata, S. Ladak, N. P. Aley, and G. B. Hix

Appl. Phys. Lett. 95, 252506 (2009); http://dx.doi.org/10.1063/1.3276073 (3 pages) | Cited 4 times

Online Publication Date: 23 December 2009

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In order to characterize the interface/surface properties of polycrystalline Co2MnSi Heusler alloy films, grain-size evolution with increasing annealing time has been investigated. Here, samples with nanometer-scale grains have been prepared by our specially-designed sputtering system in order to maximize the interface/surface area. Our well-controlled grains clearly show Si phase segregation. This Si phase becomes conductive near room temperature and may be responsible for the significant decrease in tunneling magnetoresistance previously reported by [ Wang et al., Appl. Phys. Lett. 93, 122506 (2008) ].
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64.75.-g Phase equilibria
75.70.Ak Magnetic properties of monolayers and thin films
75.47.Np Metals and alloys
81.40.Ef Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
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