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8 Apr 2002

Volume 80, Issue 14, pp. 2433-2611

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Periodic elastic domains of coexisting phases in epitaxial MnAs films on GaAs

T. Plake, M. Ramsteiner, V. M. Kaganer, B. Jenichen, M. Kästner, L. Däweritz, and K. H. Ploog

Appl. Phys. Lett. 80, 2523 (2002); http://dx.doi.org/10.1063/1.1467699 (3 pages) | Cited 78 times

Online Publication Date: 2 April 2002

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The surface topography of epitaxial MnAs films on GaAs(001) is studied by scanning probe microscopy. We provide direct experimental evidence for temperature-dependent elastic domains of the coexisting ferromagnetic αMnAs and paramagnetic βMnAs phases. The results agree well with a theoretical model for the elastic equilibrium of periodic domains. © 2002 American Institute of Physics.
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75.70.Ak Magnetic properties of monolayers and thin films
75.50.Dd Nonmetallic ferromagnetic materials
75.20.Ck Nonmetals
68.37.Ps Atomic force microscopy (AFM)
68.55.-a Thin film structure and morphology

Polaronic quasiparticle injection in organic copper (II) phthalocyanine/Bi2Sr2CaCu2O8+δ tunnel junctions

Sunmi Kim, Jungyoon E, Kiejin Lee, Takayuki Ishibashi, Katsuaki Sato, and Barry Friedman

Appl. Phys. Lett. 80, 2526 (2002); http://dx.doi.org/10.1063/1.1467703 (3 pages) | Cited 1 time

Online Publication Date: 2 April 2002

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We report the current transport properties of an organic conductor/superconductor tunnel junction as a high-Tc superconducting three terminal device. The organic copper (II) phthalocyanine (Cu–Pc) layer was used for a polaronic quasiparticle (QP) injector. The junction was investigated in the dark and under ultraviolet radiation. The injection of polaronic QP from the Cu–Pc interlayer into a superconductor Bi2Sr2CaCu2O8+δ (BSCCO) thin film generated a substantially larger nonequilibrium effect as compared to the normal QP injection current. The tunneling spectroscopy of a Cu–Pc/BSCCO junction exhibited a zero bias conductance peak, which may be interpreted as Andreev reflection at a Cu–Pc/d-wave superconductor junction. © 2002 American Institute of Physics.
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85.25.Cp Josephson devices
74.78.-w Superconducting films and low-dimensional structures
74.72.-h Cuprate superconductors
71.38.-k Polarons and electron-phonon interactions

Simplified analysis of two-layer antiferromagnetically coupled media

H. J. Richter, Er. Girt, and H. Zhou

Appl. Phys. Lett. 80, 2529 (2002); http://dx.doi.org/10.1063/1.1467977 (3 pages) | Cited 25 times

Online Publication Date: 2 April 2002

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Analytic expressions for the energy barrier at zero applied field and the switching field for a field applied along the easy axis are derived for a pair of antiferromagnetically coupled (AFC) single-domain particles at zero temperature. The energy barriers of the two single-domain particles add in zero field if the antiferromagnetic coupling exceeds a critical value ∣Jc∣ = 2(KV)1(KV)2/[S((KV)1+(KV)2)]. The antiferromagnetic coupling increases both the effective energy barrier as well as the switching field, so that optimized AFC media for recording applications require less than critical coupling ∣Jc∣. © 2002 American Institute of Physics.
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75.50.Tt Fine-particle systems; nanocrystalline materials
75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.60.Ch Domain walls and domain structure
75.50.Ss Magnetic recording materials
75.40.Mg Numerical simulation studies
75.30.Gw Magnetic anisotropy
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.

Giant magnetoimpedance in FeAg granular alloys

J. M. Soares, J. H. de Araújo, F. A. O. Cabral, T. Dumelow, F. L. A. Machado, and A. E. P. de Araújo

Appl. Phys. Lett. 80, 2532 (2002); http://dx.doi.org/10.1063/1.1468274 (3 pages) | Cited 5 times

Online Publication Date: 2 April 2002

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We have observed giant magnetoimpedance (GMI) in an FeAg granular alloy. Impedance and transverse susceptibility (TS) measurements as a function of the external dc magnetic field were made at room temperature. The variation of the magnetoimpedance ratio with magnetic field has been related to a corresponding TS ratio change as a function of the magnetic field. The peaks in the GMI and TS curves are in the same position and have been associated in both cases to effective anisotropy fields. © 2002 American Institute of Physics.
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75.47.De Giant magnetoresistance
81.05.Rm Porous materials; granular materials
72.15.Gd Galvanomagnetic and other magnetotransport effects
75.30.Cr Saturation moments and magnetic susceptibilities
75.30.Gw Magnetic anisotropy
75.50.Tt Fine-particle systems; nanocrystalline materials

System for fast time-resolved measurements of c-axis quasiparticle conductivity in intrinsic Josephson junctions of Bi2Sr2CaCu2O8+δ

J. C. Fenton, P. J. Thomas, G. Yang, and C. E. Gough

Appl. Phys. Lett. 80, 2535 (2002); http://dx.doi.org/10.1063/1.1470261 (3 pages) | Cited 16 times

Online Publication Date: 2 April 2002

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A wide-band cryogenic amplifier measurement system for time-resolved four-point current-voltage (I-V)-characteristic measurements on Bi2Sr2CaCu2O8+δ mesa structures is described. We present measurements which demonstrate the importance of self-heating on ∼ 50 ns time scales. Such heating is likely to have been very significant in many previously published measurements, where the reported nonlinear I-V characteristics have been used to derive superconducting energy gaps. © 2002 American Institute of Physics.
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74.50.+r Tunneling phenomena; Josephson effects
74.72.-h Cuprate superconductors
74.25.F- Transport properties
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