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23 Nov 2009

Volume 95, Issue 21, Articles (21xxxx)

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Appl. Phys. Lett. 95, 213501 (2009); http://dx.doi.org/10.1063/1.3265958 (3 pages)

S. Cibella, M. Ortolani, R. Leoni, G. Torrioli, L. Mahler, Ji-Hua Xu, A. Tredicucci, H. E. Beere, and D. A. Ritchie
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Probing magnetic singularities during magnetization process in FePd films

Aurélien Masseboeuf, Thomas Jourdan, Frédéric Lançon, Pascale Bayle-Guillemaud, and Alain Marty

Appl. Phys. Lett. 95, 212501 (2009); http://dx.doi.org/10.1063/1.3266825 (3 pages)

Online Publication Date: 24 November 2009

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We report the use of Lorentz microscopy to observe the domain wall structure during the magnetization process in iron-palladium thin foils. We have focused on the magnetic structure of domain walls of bubble-shaped magnetic domains near saturation. Regions are found along the domain walls where the magnetization abruptly reverses. Multiresolution magnetic simulations showed that these regions are vertical Bloch lines (VBL) and that the different bubble shapes observed are related to the inner structure of the VBL. Combining these two complementary methods, we were thus able to probe the presence of magnetic singularities as small as Bloch points in the inner magnetization of the domain walls.
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75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)

Effects of combined current injection and laser irradiation on Permalloy microwire switching

J. H. Franken, P. Möhrke, M. Kläui, J. Rhensius, L. J. Heyderman, J.-U. Thiele, H. J. M. Swagten, U. J. Gibson, and U. Rüdiger

Appl. Phys. Lett. 95, 212502 (2009); http://dx.doi.org/10.1063/1.3265944 (3 pages) | Cited 3 times

Online Publication Date: 24 November 2009

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Combined field- and current-induced domain wall (DW) motion in Permalloy microwires is studied using fast magneto-optical Kerr-microscopy. On increasing the current density, we find a decrease of Kerr signal contrast, corresponding to a reduction in the magnetization, which is attributed to Joule heating of the sample. Resistance measurements on samples with varying substrates confirm that the Curie temperature is reached when the magneto-optical contrast vanishes and reveal the importance of the heat flow into the substrate. By tuning the laser power, DWs can be pinned in the laser spot, which can thus act as a flexible pinning site for DW devices.
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61.80.Ba Ultraviolet, visible, and infrared radiation effects (including laser radiation)
75.78.Fg Dynamics of domain structures
75.60.Ch Domain walls and domain structure
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
78.20.Ls Magneto-optical effects
72.80.Ga Transition-metal compounds

Electric field control of magnetoresistance in a lateral InAs quantum well spin valve

Hyun Kum, Debashish Basu, Pallab Bhattacharya, and Wei Guo

Appl. Phys. Lett. 95, 212503 (2009); http://dx.doi.org/10.1063/1.3268432 (3 pages) | Cited 4 times

Online Publication Date: 25 November 2009

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The control of magnetoresistance of a lateral spin valve with bias applied to a gate placed outside the channel region is demonstrated. The spin valve channel consists of an InAs/In0.53Ga0.47As/In0.52Al0.48As two-dimensional electron gas lattice matched to (001) InP. The polarizer and analyzer contacts are made with 35 nm type B MnAs/In0.52Al0.48As Schottky tunnel barriers. The magnetoresistance changes from 0.14% to 4% at 10 K in a device in which the spin transport is in the direction of magnetization of the polarizer and analyzer contacts. The effect is absent in a GaAs channel spin valve and other control devices indicating that the change in magnetoresistance is due to Rashba spin-orbit coupling.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Cc Other ferromagnetic metals and alloys
72.25.-b Spin polarized transport
72.20.My Galvanomagnetic and other magnetotransport effects

Ferromagnetic to weak-magnetic transition accompanied by bcc to fcc transformation in Fe–Mn–Al alloy

K. Ando, T. Omori, I. Ohnuma, R. Kainuma, and K. Ishida

Appl. Phys. Lett. 95, 212504 (2009); http://dx.doi.org/10.1063/1.3266848 (3 pages) | Cited 6 times

Online Publication Date: 25 November 2009

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Magnetic properties and phase change in Fe-36 at. %Mn-15 at. %Al ternary alloy were investigated. Direct evidence of a ferromagnetic to weak-magnetic transition accompanied by martensitic transformation from the bcc-α (A2) phase to the fcc-γ′ (2M) phase was obtained, where the magnetic state of the parent and the martensite phases are ferromagnetic and weak-magnetic, respectively. The origin of this unique phase change is caused by the peculiar γ-loop of α/γ equilibrium formed in Fe–Mn–X (X: ferrite stabilizing element) system due to the magnetic effect.
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75.50.Bb Fe and its alloys
81.30.Kf Martensitic transformations
64.70.kd Metals and alloys
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)

Weak-link behavior of grain boundaries in superconducting Ba(Fe1−xCox)2As2 bicrystals

S. Lee, J. Jiang, J. D. Weiss, C. M. Folkman, C. W. Bark, C. Tarantini, A. Xu, D. Abraimov, A. Polyanskii, C. T. Nelson, Y. Zhang, S. H. Baek, H. W. Jang, A. Yamamoto, F. Kametani, et al.

Appl. Phys. Lett. 95, 212505 (2009); http://dx.doi.org/10.1063/1.3262953 (3 pages) | Cited 54 times

Online Publication Date: 25 November 2009

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We show that despite the low anisotropy, strong vortex pinning, and high irreversibility field Hirr close to the upper critical field Hc2 of Ba(Fe1−xCox)2As2, the critical current density Jgb across [001] tilt grain boundaries (GBs) of thin film Ba(Fe1−xCox)2As2 bicrystals is strongly depressed, similar to high-Tc cuprates. Our results suggest that weak-linked GBs are characteristic of both cuprates and pnictides because of competing orders, low carrier density, and unconventional pairing symmetry.
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74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions
74.25.Wx Vortex pinning (includes mechanisms and flux creep)
74.25.Sv Critical currents
61.72.Mm Grain and twin boundaries
74.70.Xa Pnictides and chalcogenides
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