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9 Aug 1999

Volume 75, Issue 6, pp. 745-878

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Thickness dependence of magnetic properties of granular thin films with interacting particles

Leszek M. Malkinski, Jian-Qing Wang, Jianbiao Dai, Jinke Tang, and Charles J. O’Connor

Appl. Phys. Lett. 75, 844 (1999); http://dx.doi.org/10.1063/1.124532 (3 pages) | Cited 8 times

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The effect of film thickness on magnetic properties of Cu80Co20 granular alloy was studied. It was observed that the susceptibility peak temperature, TM, strongly increases with the film thickness, t, for t<100 nm. The long-range nature of this effect points to magnetic dipole interaction as responsible mechanism. This dependence of TM can be explained within the framework of Dormann’s theory of dipolar interaction between magnetic particles. The coercive field has different thickness dependence and it is related to formation of magnetic domain structure of Co particles in the granular alloy. © 1999 American Institute of Physics.
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75.50.Tt Fine-particle systems; nanocrystalline materials
75.70.Ak Magnetic properties of monolayers and thin films
75.30.Cr Saturation moments and magnetic susceptibilities
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.60.Ch Domain walls and domain structure

Thermally activated demagnetization in Co/Ni multilayers involving discrete identifiable stages

J. M. González, A. Salcedo, F. Cebollada, J. J. Freijo, J. L. Muñoz, and A. Hernando

Appl. Phys. Lett. 75, 847 (1999); http://dx.doi.org/10.1063/1.124533 (3 pages) | Cited 1 time

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We present data, obtained from measured Co/Ni multilayers, that indicate that the magnetic relaxation processes take place through a nucleation-coalescence sequence, and thus crucially implicates the existance of exchange and dipolar interactions. Depending on the layer thickness the relaxation proceeds either through a single global stage or through several partial ones. In both cases the relaxation stages involve a time lapse during which the macroscopic state of the system evolves very slowly, followed by a sharp variation of the total moment of the sample. Such behavior clearly implies a significant departure from the conventionally accepted Arrhenius relaxation kinetics. © 1999 American Institute of Physics.
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75.70.Cn Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.50.Cc Other ferromagnetic metals and alloys
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
75.30.Et Exchange and superexchange interactions
78.20.Ls Magneto-optical effects
78.66.Bz Metals and metallic alloys

Tailoring of high-Tc Josephson junctions by doping their electrodes

C. W. Schneider, R. R. Schulz, B. Goetz, A. Schmehl, H. Bielefeldt, H. Hilgenkamp, and J. Mannhart

Appl. Phys. Lett. 75, 850 (1999); http://dx.doi.org/10.1063/1.124534 (3 pages) | Cited 26 times

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Appropriate doping of the electrodes of high-Tc Josephson junctions provides a means to systematically adjust the junctions’ electronic properties. This is demonstrated for the exemplary case of grain boundary junctions in bicrystalline Ca-doped YBa2Cu3O7−δ films. It is found that the critical current density is strongly increased and the normal state resistivity significantly reduced in comparison with the values obtained for equivalent junctions in undoped films. © 1999 American Institute of Physics.
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85.25.Cp Josephson devices
74.50.+r Tunneling phenomena; Josephson effects
74.78.-w Superconducting films and low-dimensional structures
74.25.F- Transport properties
74.72.-h Cuprate superconductors
74.25.Sv Critical currents
61.72.Mm Grain and twin boundaries
74.25.Jb Electronic structure (photoemission, etc.)
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