Effect of surface roughness on laser-driven instability dewetting of ultrathin Co films

C. Favazza; J. Trice; H. Krishna; R. Kalyanaraman

doi:10.1117/12.795271

9 September 2008 Effect of surface roughness on laser-driven instability dewetting of ultrathin Co films

C. Favazza, J. Trice, H. Krishna, R. Kalyanaraman

Proceedings Volume 7039, Nanoengineering: Fabrication, Properties, Optics, and Devices V; 703907 (2008) https://doi.org/10.1117/12.795271
Event: NanoScience + Engineering, 2008, San Diego, California, United States

Abstract

Previous studies on dewetting of ultrathin Co films by nanosecond pulsed laser melting have shown that the films dewet due to a thin film hydrodynamic instability and form a system of ordered nanoparticles with uniform average size and nearest neighbor particle spacing. For Co films less than 8 nm thick, the nanoparticle spacing, λ_NN was dependent on the initial film thickness, h, and varied as h². For Co films thicker than 8 nm, the nanoparticle spacing decreased with increasing film thickness, due to a thermocapillary effect generated by the ns laser heating. Here we show the results from investigations on dewetting of Co films that had initially much rougher surfaces with root mean square roughness values, 0.9 < R_rms < 2.8 nm as compared to smoother films examined in prior investigations, for which R_rms ≤ 0.2 nm. Laser induced dewetting of Co films with much large R_rms values generated nanoparticles that were qualitatively similar to those created from smoother Co films. The size distribution of the nanoparticles was monodispersed and there was short range spatial order present in the system from the average nearest neighbor nanoparticle spacing; however, a drastic reduction in the characteristic length scales was observed in the nanoparticulate arrays created from the rougher Co films. This result suggests that knowledge of film thickness and roughness are important towards predicting characteristic length scales from metal film dewetting.

Citation Download Citation

C. Favazza, J. Trice, H. Krishna, and R. Kalyanaraman "Effect of surface roughness on laser-driven instability dewetting of ultrathin Co films", Proc. SPIE 7039, Nanoengineering: Fabrication, Properties, Optics, and Devices V, 703907 (9 September 2008); https://doi.org/10.1117/12.795271

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available