Material damage induced by nanofabrication processes in manganite thin films

Area of Science:

• Materials Science
• Nanotechnology
• Condensed Matter Physics

Background:

• Oxide-based magnetic and magnetoelectronic devices are crucial for advanced electronics.
• Focused Ion Beam (FIB) is a potential nanofabrication technique for these devices.

Purpose of the Study:

• To investigate the suitability of FIB lithography for patterning La(2/3)Ca(1/3)MnO(3) thin films.
• To understand the impact of FIB processing on the transport properties of these magnetic oxide films.

Main Methods:

• Focused Ion Beam (FIB) lithography was employed for patterning La(2/3)Ca(1/3)MnO(3) films.
• Auger spectroscopy was used to analyze the chemical composition of patterned areas.
• Transport properties of the patterned films were measured.

Main Results:

• FIB lithography significantly degraded the transport properties of the patterned La(2/3)Ca(1/3)MnO(3) areas.
• Alternative, less aggressive patterning methods did not result in property degradation.
• Auger spectroscopy confirmed gallium (Ga+) ion implantation in FIB-patterned regions, correlating with the observed degradation.

Conclusions:

• FIB lithography, while a powerful nanofabrication tool, introduces detrimental Ga+ ion implantation in La(2/3)Ca(1/3)MnO(3) films.
• The ion implantation process negatively impacts the electrical transport properties of these magnetic oxide films.
• Careful selection of nanofabrication techniques is essential to preserve the functionality of oxide-based magnetoelectronic devices.