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Kinetic Roughening and Material Optical Properties Influence on Van der Waals/Casimir Forces

100%

van Zwol P., Palasantzas G.

Acta Physica Polonica A

2010

vol. 117

issue 2

379-383

Atomic force microscopy measurements and force theory calculations using the Lifshitz theory show that van der Waals/Casimir dispersive forces have a strong dependence on surface roughness and material optical properties. It is found that at separations below 100 nm the roughness effect is manifested through a strong deviation from the normal scaling of the force with separation distance. Moreover, knowledge of precise optical properties of metals is shown to be very important for accurate force predictions rather than referring to idealized defect free material models. Finally, we compare the van der Waals/Casimir forces to capillary adhesive forces in order to illustrate their significance in stiction problems.

Correlated Roughness Effects in the Giant Magnetoresistance of Magnetic Multilayers

81%

Palasantzas G., Barnaś J., De Hosson J.

Acta Physica Polonica A

2000

vol. 97

issue 3

495-498

Interface roughness effects on the giant magnetoresistance in magnetic multilayers are analysed theoretically for structures with non-conformal correlated interfaces. The roughness of each interface is described in terms of the K-correlation model and is characterized by the roughness exponent H(0≤H<1), correlation length ξ, and rms roughness amplitude Δ. Coherent scattering by different interfaces is also taken into account.

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2 Acta Physica Polonica A

1 2010

1 2000

2 Palasantzas G.

1 Barnaś J.

1 De Hosson J.

1 van Zwol P.

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Kinetic Roughening and Material Optical Properties Influence on Van der Waals/Casimir Forces

Correlated Roughness Effects in the Giant Magnetoresistance of Magnetic Multilayers