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20 Jul 2009

Volume 95, Issue 3, Articles (03xxxx)

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Appl. Phys. Lett. 95, 033502 (2009); http://dx.doi.org/10.1063/1.3178556 (3 pages)

Akihito Ikedo, Takahiro Kawashima, Takeshi Kawano, and Makoto Ishida
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Magnetically controlled superconducting weak links

J. Van de Vondel, A. V. Silhanek, B. Raes, W. Gillijns, R. B. G. Kramer, V. V. Moshchalkov, J. Sautner, and V. Metlushko

Appl. Phys. Lett. 95, 032501 (2009); http://dx.doi.org/10.1063/1.3180492 (3 pages) | Cited 4 times

Online Publication Date: 20 July 2009

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We have designed and characterized a magnetic template which can be switched between chains of parallel and antiparallel field distribution by applying an in-plane magnetic field. The parallel field profile creates highly mobile vortex channels in a superconducting film deposited on top, reproducing the behavior of a weak link as evidenced by the presence of Shapiro steps in the current-voltage characteristics under rf excitation. The Josephson coupling can be fully suppressed by changing the field distribution to the antiparallel state. As a result, a reversible ON/OFF switch for magnetically induced weak links has been demonstrated.
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85.25.Cp Josephson devices
74.78.-w Superconducting films and low-dimensional structures
74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.50.+r Tunneling phenomena; Josephson effects

Magneto-optical Kerr effect in perpendicularly magnetized Co/Pt films on two-dimensional colloidal crystals

Z. Liu, L. Shi, Z. Shi, X. H. Liu, J. Zi, S. M. Zhou, S. J. Wei, J. Li, X. Zhang, and Y. J. Xia

Appl. Phys. Lett. 95, 032502 (2009); http://dx.doi.org/10.1063/1.3182689 (3 pages) | Cited 9 times

Online Publication Date: 21 July 2009

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Magneto-optical Kerr effect and optical reflectance are measured in the visible region for perpendicularly magnetized Co/Pt films on self-assembly array of two-dimensional closely packed polystyrene spheres. Peaks and valleys are observed in the magneto-optical Kerr and the optical reflectance spectra and their positions scale with the sphere diameter. In explanation of the above scenario, not only the Mie optical scattering of single nanocaps but also the surface plasmon resonance should be considered. This work will facilitate development of magnetoplasmonic nanosensors.
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75.70.Ak Magnetic properties of monolayers and thin films
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
82.70.Dd Colloids
78.20.Ls Magneto-optical effects
73.20.Mf Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
81.05.Bx Metals, semimetals, and alloys

Anomalous Hall effect in quarternary Heusler-type Ni50Mn17Fe8Ga25 melt-spun ribbons

Zhiyong Zhu, Siu Wing Or, and Guangheng Wu

Appl. Phys. Lett. 95, 032503 (2009); http://dx.doi.org/10.1063/1.3176479 (3 pages) | Cited 4 times

Online Publication Date: 21 July 2009

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The anomalous Hall effect (AHE) in quarternary Heusler-type Ni50Mn17Fe8Ga25 melt-spun ribbons is investigated. Experimental correlation between saturated anomalous Hall resistivity (ρAMS) and longitudinal resistivity (ρxx) is achieved for the low-temperature martensitic phase and the high-temperature austenitic phase as ρAMS∞ρxxn = 4.2 and ρAMS∞ρxxn = 2.1, respectively. The unexpectedly large exponent of n = 4.2 in the martensitic phase is found to contradict the traditional theory of AHE with n = 1–2, but it can be explained by a side-jump model beyond the short-range limit as a result of the intermediate-range spin-dependent electron scattering by relatively large Mn-rich clusters instead. The restoration of the exponent back to a normal value of n = 2.1 in the austenitic phase is ascribed to the domination of the electron scattering by phonons, compared to that by the Mn-rich clusters, at elevated temperatures and with phonon softening in the transverse-acoustic TA2 mode.
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72.15.Gd Galvanomagnetic and other magnetotransport effects
71.38.-k Polarons and electron-phonon interactions
81.30.Kf Martensitic transformations
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
64.70.kd Metals and alloys
75.50.Bb Fe and its alloys

Resistance of domain walls created by means of a magnetic force microscope in transversally magnetized epitaxial Fe wires

C. Hassel, S. Stienen, F. M. Römer, R. Meckenstock, G. Dumpich, and J. Lindner

Appl. Phys. Lett. 95, 032504 (2009); http://dx.doi.org/10.1063/1.3187219 (3 pages) | Cited 3 times

Online Publication Date: 22 July 2009

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Magnetic domain walls are created in a controllable way in transversally magnetized epitaxial Fe wires on GaAs(110) by approaching a magnetic force microscope (MFM) tip. The electrical resistance-change due to the addition of these domain walls is measured. The anisotropic magnetoresistance as well as the intrinsic domain wall resistance contribute to the resistance-change. The efficiency of this procedure is proven by MFM images, which are obtained subsequent to the domain wall creation at a larger sample-to-probe distance. The contribution of the anisotropic magnetoresistance is calculated using micromagnetic calculations, thus making it possible to quantify the intrinsic domain wall resistance.
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75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.70.Ak Magnetic properties of monolayers and thin films
75.47.Np Metals and alloys
81.05.Bx Metals, semimetals, and alloys
68.37.Rt Magnetic force microscopy (MFM)
73.61.At Metal and metallic alloys

Domain-wall depinning by controlling its configuration at notch

Sheng-Huang Huang and Chih-Huang Lai

Appl. Phys. Lett. 95, 032505 (2009); http://dx.doi.org/10.1063/1.3187530 (3 pages) | Cited 11 times

Online Publication Date: 22 July 2009

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We study current-induced magnetic domain wall (DW) motion in nanostripes with reduced dimensions in which transverse-type DWs are stable. Micromagnetic simulation reveals that the depinning probability of the DW strongly depends on the DW configuration when the DW approaches the notch. The spin torque energy does not only drive DW motion but contribute to the transformation of DW configurations between transverse- and antivortex-type when the current density is above a threshold value. When the DW changes from the transverse to antivortex state, it stores potential energy which helps it to depin from the notch.
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75.70.Kw Domain structure (including magnetic bubbles and vortices)
75.70.Ak Magnetic properties of monolayers and thin films
75.40.Mg Numerical simulation studies
75.50.Tt Fine-particle systems; nanocrystalline materials

Atomic-scale spectroscopic imaging of CoFeB/Mg–B–O/CoFeB magnetic tunnel junctions

J. J. Cha, J. C. Read, W. F. Egelhoff, Jr., P. Y. Huang, H. W. Tseng, Y. Li, R. A. Buhrman, and D. A. Muller

Appl. Phys. Lett. 95, 032506 (2009); http://dx.doi.org/10.1063/1.3184766 (3 pages) | Cited 23 times

Online Publication Date: 23 July 2009

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Atomic-scale electron spectroscopic imaging on sputtered magnetic tunnel junctions (MTJs) with a thin, <2 nm, MgO layer and B-alloyed electrodes reveals B diffusion into the MgO, resulting in a Mg–B–O tunnel barrier. This ∼ 2 nm thick interfacial layer forms due to oxidation of CoFeB during radio frequency sputtering of MgO and subsequent B diffusion into MgO during annealing. We measure a room-temperature tunneling magnetoresistance (TMR) of ∼ 200% in IrMn/CoFeB/Mg–B–O/CoFeB MTJs after annealing, demonstrating that thin Mg–B–O barriers can produce relatively high TMR.
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75.70.Ak Magnetic properties of monolayers and thin films
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
66.30.H- Self-diffusion and ionic conduction in nonmetals
75.47.Pq Other materials
81.15.Cd Deposition by sputtering
81.40.Gh Other heat and thermomechanical treatments
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