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3 Sep 2012

Volume 101, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 101, 103101 (2012); http://dx.doi.org/10.1063/1.4748099 (5 pages)

Massimo Cuscunà, Annalisa Convertino, Emiliano Zampetti, Antonella Macagnano, Alessandro Pecora, Guglielmo Fortunato, Laura Felisari, Giuseppe Nicotra, Corrado Spinella, and Faustino Martelli
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Size effect on the electron wind force for electromigration at the top metal-dielectric interface in nanoscale interconnects

Zhuo-Jie Wu and Paul S. Ho

Appl. Phys. Lett. 101, 101601 (2012); http://dx.doi.org/10.1063/1.4750067 (5 pages)

Online Publication Date: 4 September 2012

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We report a classical model on the size effect of the electron wind force on a metal atom at the metal-dielectric interface in nanoscale interconnects. The effect is expressed as a size factor S for the effective charge Z*e. It is found that the size factor decreases with scaling due to reduced electron drift momentum as a result of scattering at interfaces and grain boundaries. The electron wind force on the metal atoms at the top metal-dielectric interface is enhanced by the interface scattering. This force enhancement is partially mitigated by the grain boundary scattering.
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66.30.Qa Electromigration
72.30.+q High-frequency effects; plasma effects
61.72.Mm Grain and twin boundaries

Doubling of rocking resonance frequency of an adhesive microparticle vibrating on a surface

Armin Saeedi Vahdat, Saber Azizi, and Cetin Cetinkaya

Appl. Phys. Lett. 101, 101602 (2012); http://dx.doi.org/10.1063/1.4751109 (4 pages)

Online Publication Date: 7 September 2012

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For some spherical micro-particles on a vibrating flat substrate, in addition to their predicted rocking resonance frequencies, other resonance peaks at their doubles are observed. Here, a mathematical model and experimental results are presented for explaining this observation. It is determined that the frequency doubling is caused by nonlinear coupling between the out-of-plane and rocking modes of motion, and whirling-like motion that must be present for the presence of doubling effect. It is also found that the work-of-adhesion values extracted from the experimental resonance frequencies of a set of particles using the developed model are in good agreement with those reported in the literature.
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68.35.Np Adhesion
68.35.Gy Mechanical properties; surface strains
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