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31 May 1999

Volume 74, Issue 22, pp. 3245-3412

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Sub-50 nm planar magnetic nanostructures fabricated by ion irradiation

T. Devolder, C. Chappert, Y. Chen, E. Cambril, H. Bernas, J. P. Jamet, and J. Ferré

Appl. Phys. Lett. 74, 3383 (1999); http://dx.doi.org/10.1063/1.123352 (3 pages) | Cited 70 times

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He+ ion irradiation of Co–Pt multilayers through a silica mask obtained by a combination of high resolution lithography and reactive ion etching can produce an optical contrast-free, entirely planar, sub-50 nm magnetically patterned array. Furthermore, the specificity of magnetization reversal in such arrays leads to a weak dispersion of coercive forces. The technique holds promise for both present hard disk technology and future near field magneto-optical recording. © 1999 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.50.Ss Magnetic recording materials
81.65.Cf Surface cleaning, etching, patterning
85.70.Sq Magnetooptical devices
42.79.Vb Optical storage systems, optical disks

Subnanosecond magnetization dynamics measured by the second-harmonic magneto-optic Kerr effect

T. M. Crawford, T. J. Silva, C. W. Teplin, and C. T. Rogers

Appl. Phys. Lett. 74, 3386 (1999); http://dx.doi.org/10.1063/1.123353 (3 pages) | Cited 58 times

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We have measured the in-plane magnetization dynamics of Ni81Fe19 films using the surface- and interface-sensitive second-harmonic magneto-optic Kerr effect. The dynamical magnetization was measured on patterned Ni81Fe19 stripes as a function of an in-plane magnetic field applied parallel to the anisotropy axis. The excitation sources were 100 ps risetime magnetic field impulses and steps. The minimum magnetization switching times were <300 ps, and precessional free-induction decay was observed. The dynamics for both impulse and step excitation are fitted to the Landau–Lifshitz equation, yielding values for the anisotropy field, gyroscopic splitting factor, and damping. The local surface precessional frequency and anisotropy are different from the average bulk values, demonstrating that this technique possesses the necessary sensitivity to detect variations in localized surface and interface dynamics. © 1999 American Institute of Physics.
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75.70.Ak Magnetic properties of monolayers and thin films
75.50.Bb Fe and its alloys
75.40.Gb Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
78.20.Ls Magneto-optical effects
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.70.Rf Surface magnetism
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
75.30.Gw Magnetic anisotropy
78.66.Bz Metals and metallic alloys

Magnetic properties of annular Josephson junctions for radiation detection: Experimental results

R. Cristiano, E. Esposito, L. Frunzio, M. P. Lisitskii, C. Nappi, G. Ammendola, A. Barone, L. Parlato, D. V. Balashov, and V. N. Gubankov

Appl. Phys. Lett. 74, 3389 (1999); http://dx.doi.org/10.1063/1.123354 (3 pages) | Cited 9 times

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We report on experimental results about Josephson junctions for radiation detection with an annular geometry. The observed suppression of the critical Josephson current and the presence of one single resonance step in the current–voltage characteristic, as predicted by the theory, strongly support the idea that this geometry could be very convenient for radiation detection. The results were obtained when one single magnetic fluxon was trapped in the central hole, and they represent the first experimental confirmation of the theoretical predictions in the case of annular junctions with finite ring width. © 1999 American Institute of Physics.
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74.45.+c Proximity effects; Andreev reflection; SN and SNS junctions
85.25.Cp Josephson devices
74.25.Sv Critical currents
74.70.Ad Metals; alloys and binary compounds (including A15, MgB2, etc.)

Observation of Tomasch oscillations and tunneling-like behavior in oxygen-deficient edge junctions

O. Nesher and G. Koren

Appl. Phys. Lett. 74, 3392 (1999); http://dx.doi.org/10.1063/1.123355 (3 pages) | Cited 7 times

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Properties of oxygen-deficient edge junctions made of YBa2Cu3O6.6 as the superconductor and YBa2Cu3−xFexOy as the barrier are reported. These junctions show weak-link characteristics when the edge angle is 50°, while tunneling-like behavior is observed when the edge angle is 36°. In all junctions strong peaks in the conductivity are found, which depend on the specific junction geometry. Some series of peaks were identified as due to Tomasch oscillations in the cover electrode, which yield Δ = 1.4±0.2 meV and vF′ = (4.4±0.2)×107 cm/s. © 1999 American Institute of Physics.
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74.50.+r Tunneling phenomena; Josephson effects
74.72.-h Cuprate superconductors
61.66.Bi Elemental solids
61.66.Dk Alloys
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