Presentation Title

The Characterization of a Two-axis Magnetic Actuator

Start Date

November 2016

End Date

November 2016

Location

HUB 302-#92

Type of Presentation

Poster

Abstract

The goal in this research project is to design and implement a low cost scanning tunneling microscope (STM). We are pursuing this goal by using low cost materials, simple construction techniques, and a novel approach to tip actuation using a combination of rare earth magnets, hand-wound solenoids, and a single piezoelectric stack. The magnetic components are assembled into a “magnetic cross” that allows for actuation along two axes. We have used a Michelson interferometer to characterize the actuation system at nanometer precision. The two design variables that we characterized in depth were the length of the stem of the cross and the gap between the solenoids and the magnets. The total tip displacement is strongly dependent on these two variables. We will show that our results are consistent with the Euler–Bernoulli beam-bending model, and consistent with dipole-dipole coupling of the magnets and the solenoids. After characterizing these two variables, we were able to determine the optimal size for the magnetic cross and finalize its dimensions. We were also able to estimate theoretical resolution values for a number of different voltage ranges. We will present the details of the measurement process, and measurements of its performance.

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Nov 12th, 4:00 PM Nov 12th, 5:00 PM

The Characterization of a Two-axis Magnetic Actuator

HUB 302-#92

The goal in this research project is to design and implement a low cost scanning tunneling microscope (STM). We are pursuing this goal by using low cost materials, simple construction techniques, and a novel approach to tip actuation using a combination of rare earth magnets, hand-wound solenoids, and a single piezoelectric stack. The magnetic components are assembled into a “magnetic cross” that allows for actuation along two axes. We have used a Michelson interferometer to characterize the actuation system at nanometer precision. The two design variables that we characterized in depth were the length of the stem of the cross and the gap between the solenoids and the magnets. The total tip displacement is strongly dependent on these two variables. We will show that our results are consistent with the Euler–Bernoulli beam-bending model, and consistent with dipole-dipole coupling of the magnets and the solenoids. After characterizing these two variables, we were able to determine the optimal size for the magnetic cross and finalize its dimensions. We were also able to estimate theoretical resolution values for a number of different voltage ranges. We will present the details of the measurement process, and measurements of its performance.