A combined approach to predict spatial temperature evolution and its consequences during FIB processing of soft...

Area of Science:

• Materials Science
• Nanotechnology
• Computational Physics

Background:

• Focused Ion Beam (FIB) processing can cause significant thermal damage to sensitive materials like polymers and biomaterials.
• Understanding and controlling localized temperature increases during FIB is critical for preserving material integrity.

Purpose of the Study:

• To develop and validate a predictive model for local temperatures during FIB patterning.
• To analyze the spatial and temporal evolution of temperature distributions.
• To investigate the impact of different scanning strategies on thermal effects.

Main Methods:

• Combined ion trajectory simulations with thermal spike model calculations.
• Performed calculations without approximations or correction factors.
• Validated model predictions against experimental data for polymers.

Main Results:

• The model accurately predicts local temperatures and their evolution during FIB patterning.
• Results show excellent agreement with experimental data for polymers, considering their thermal properties.
• Different scanning strategies were analyzed, revealing significant temperature increases with conventional methods.

Conclusions:

• The developed model provides a reliable tool for predicting thermal behavior during FIB processing.
• Classically applied FIB patterning strategies can lead to excessive temperatures, disqualifying low melting point materials.
• This research offers insights for optimizing FIB processing to minimize thermal damage.