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28 Aug 2006

Volume 89, Issue 9, Articles (09xxxx)

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Appl. Phys. Lett. 89, 093101 (2006); http://dx.doi.org/10.1063/1.2338808 (3 pages)

Nicholas Jabari Lee, Rajiv K. Kalia, Aiichiro Nakano, and Priya Vashishta
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Diffusion process and formation of super-spin-glass state in soft magnetic Fe/Pt system

D. Aurongzeb, M. Holtz, and Latika Menon

Appl. Phys. Lett. 89, 092501 (2006); http://dx.doi.org/10.1063/1.2335977 (3 pages) | Cited 3 times

Online Publication Date: 28 August 2006

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We report results on surface and micromagnetic structures of Fe thin films consisting of a Pt underlayer. We use atomic force microscopy to study the surface structure evolution of the Fe films as a function of annealing time at an annealing temperature of 800 °C. Power spectral density analysis shows saturation in roughness exponent after 15 min of annealing. However, lateral correlation length and roughness continue to increase for up to 45 min. At high annealing temperature, the authors find two separate phase correlation lengths and a single surface correlation length indicating super-spin-glass state in the system.
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75.70.Ak Magnetic properties of monolayers and thin films
75.50.Bb Fe and its alloys
75.50.Lk Spin glasses and other random magnets
66.30.-h Diffusion in solids
81.40.Gh Other heat and thermomechanical treatments
75.60.Ch Domain walls and domain structure

Magnetic anisotropy of (110) Fe/Co superlattices

V. A. Vas’ko, Miyoung Kim, O. Mryasov, V. Sapozhnikov, M. K. Minor, A. J. Freeman, and M. T. Kief

Appl. Phys. Lett. 89, 092502 (2006); http://dx.doi.org/10.1063/1.2337282 (3 pages) | Cited 6 times

Online Publication Date: 30 August 2006

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Magnetic anisotropy field of (110) Fe/Co superlattices was found to be as high as 1 T, with an in-plane easy axis. First principles calculations within the local spin density approximation show good agreement with the measurement. Lowering the symmetry by creating artificial superlattice structures leads to a significant increase in magnetic anisotropy energy as compared with any allotropic form of the elemental components and cubic FeCo. Large anisotropy is attributed to the cubic symmetry breaking due to the multilayer artificial atomic arrangement. Dependence of the anisotropy field on the superlattice period is supported by Monte Carlo film growth modeling.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.30.Gw Magnetic anisotropy
75.40.Mg Numerical simulation studies
75.50.Bb Fe and its alloys

Shape induced anomalies in vortex pinning and dynamics of superconducting antidot arrays with spherical cavities

E. T. Filby, A. A. Zhukov, P. A. J. de Groot, M. A. Ghanem, P. N. Bartlett, and V. V. Metlushko

Appl. Phys. Lett. 89, 092503 (2006); http://dx.doi.org/10.1063/1.2339047 (3 pages) | Cited 9 times

Online Publication Date: 31 August 2006

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Using electrochemical deposition of Pb in the pores of templates prepared by self-assembly from colloidal suspensions of polystyrene latex spheres, well ordered superconducting antidot arrays with spherically shaped holes are fabricated. In contrast to conventional lithographic arrays the samples with spherical cavities demonstrate significantly reduced pinning strength favoring the formation of commensurate states. The ac-flux penetration acquires a hybrid intra- and intervalley regime. For high ac drives an unusual inversion to paramagnetic ac shielding is found at commensurate states.
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74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
74.25.Ha Magnetic properties including vortex structures and related phenomena
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)
81.16.Dn Self-assembly
61.72.Qq Microscopic defects (voids, inclusions, etc.)
81.15.Pq Electrodeposition, electroplating

Superconducting single-phase Sr1−xLaxCuO2 thin films with improved crystallinity grown by pulsed laser deposition

Victor Leca, Dave H. A. Blank, Guus Rijnders, Sara Bals, and Gustaaf van Tendeloo

Appl. Phys. Lett. 89, 092504 (2006); http://dx.doi.org/10.1063/1.2339840 (3 pages) | Cited 7 times

Online Publication Date: 31 August 2006

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Sr1−xLaxCuO2−δ (x = 0.10–0.20) thin films exhibiting an oxygen-deficient 2mathap×2mathap×c structure (ap and c represent the cell parameters of the perovskite subcell) were epitaxially grown by means of pulsed laser deposition in low-pressure oxygen ambient. (001) KTaO3 and (001) SrTiO3 single crystals were used as substrates, with BaTiO3 as buffer layer. The Sr1−xLaxCuO2−δ films were oxidized during cooling down in order to yield the infinite-layer-type structure. By applying this method, high quality single-phase Sr1−xLaxCuO2 thin films could be obtained for 0.10 ⩽ x ⩽ 0.175 doping range. The films grown on BaTiO3/KTaO3 show superconductivity for 0.15 ⩽ x ⩽ 0.175 with optimum doping at x = 0.15, in contrast with previously reported data.
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74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
81.15.Fg Pulsed laser ablation deposition

Improvement of low-field magnetoresistance and Curie temperature in the hole doping of double perovskites Sr2FeMoO6 polycrystals

M. F. Lü, J. P. Wang, J. F. Liu, X. F. Hao, D. F. Zhou, Z. J. Wu, and Jian Meng

Appl. Phys. Lett. 89, 092505 (2006); http://dx.doi.org/10.1063/1.2344846 (3 pages) | Cited 2 times

Online Publication Date: 31 August 2006

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Polycrystalline Sr2FeMoO6 compounds with most vacancies at normal Fe sites were fabricated through Mo hole doping; its effect is similar to Fe3+ by our estimation. Sharp increase of magnetoconductance at low field was evidence of spin-polarized tunneling between the grains. The room temperature low-field magnetoresistivity at optimal doping x = 0.03 is 8.5% in 3000 Oe and increases to 11.4% in 1 T associated with soft magnetic behaviors; furthermore it exhibits a ferromagnetic Curie temperature of 450 K, connected with hole doping effect. The improved magnetoresistivity behavior was related to Curie temperature.
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75.47.Pq Other materials
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
75.50.Dd Nonmetallic ferromagnetic materials
72.20.My Galvanomagnetic and other magnetotransport effects
61.72.up Other materials
61.72.J- Point defects and defect clusters

Point contact Andreev reflection by nanoindentation of polymethyl methacrylate

E. Clifford and J. M. D. Coey

Appl. Phys. Lett. 89, 092506 (2006); http://dx.doi.org/10.1063/1.2345361 (3 pages) | Cited 3 times

Online Publication Date: 1 September 2006

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A versatile technique for performing spin polarization measurements via point contact Andreev reflection has been developed. This technique involves depositing a superconductor (lead) onto a thin film of the material to be studied through a nanohole formed in a layer of photoresist, using an atomic force microscope as a nanoindenter. Copper and nickel were used to demonstrate the method. The polarizations of CrO2 and Co2MnSi were also measured, the former giving a value of 95%, as expected, and the latter giving 20%, which was surprisingly low for a candidate half metal.
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72.25.Ba Spin polarized transport in metals
75.50.Cc Other ferromagnetic metals and alloys
75.50.Dd Nonmetallic ferromagnetic materials
73.40.Ns Metal-nonmetal contacts
73.61.At Metal and metallic alloys
82.37.Gk STM and AFM manipulations of a single molecule

Soft x-ray resonant magnetic scattering from an imprinted magnetic domain pattern

C. J. Kinane, A. K. Suszka, C. H. Marrows, B. J. Hickey, D. A. Arena, J. Dvorak, T. R. Charlton, and Sean Langridge

Appl. Phys. Lett. 89, 092507 (2006); http://dx.doi.org/10.1063/1.2344935 (3 pages) | Cited 7 times

Online Publication Date: 1 September 2006

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The authors report on the use of a Co/Pt multilayer, which exhibits strong perpendicular magnetic anisotropy, to magnetostatically imprint a domain pattern onto a 50 Å thick Permalloy layer. Element specific soft x-ray magnetic scattering experiments were then performed so as to be sensitive to the magnetic structure of the Permalloy only. Off-specular magnetic satellite peaks, corresponding to a periodic domain stripe width of 270 nm, were observed, confirmed by magnetic force microscopy and micromagnetic modeling. Thus the authors have exploited the element specificity of soft x-ray scattering to discern the purely magnetic correlations in a structurally flat Permalloy film.
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78.70.Ck X-ray scattering
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ch Domain walls and domain structure
75.30.Gw Magnetic anisotropy
75.25.-j Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
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