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projects:stm [2025/08/26 00:42] – [Other Projects] rahixprojects:stm [2025/09/20 21:33] (current) – rahix
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 The scanning head of our STM uses 3 piezo actuators oriented along the 3 cartesian axes.  We currently do not have data on their actuation range. The scanning head of our STM uses 3 piezo actuators oriented along the 3 cartesian axes.  We currently do not have data on their actuation range.
  
-The tip is made from tungsten wire and mounted to the scanning head using a screw terminal.+{{:projects:stm:stm-piezos.png?600|}} 
 +{{:projects:stm:pxl_20250920_212713202.jpg?600|}}
  
-To be documented.+  * 1: x-axis piezo 
 +  * 2: y-axis piezo 
 +  * 3: z-axis piezo (height) 
 +  * 4: STM tip mount 
 + 
 +The tip is made from tungsten wire and mounted to the scanning head using a screw terminal.  From there, a very short length of coax-cable connects the tip directly to the preamplifier board.
  
 === STM Mount === === STM Mount ===
 The STM mount consists of two aluminum plates which seat against each other precisely using a [[http://www.g2-engineering.com/technology-kinematics|kinematic mount]] made from 3 micrometer screws. The STM mount consists of two aluminum plates which seat against each other precisely using a [[http://www.g2-engineering.com/technology-kinematics|kinematic mount]] made from 3 micrometer screws.
  
-The tip/probe is mounted slightly in front of two of the screws with the last one sitting very far back.  This makes a fulcrum with the back screw having even more fine adjust (factor 20).+{{:projects:stm:stm-kinematic-mount.png?600|}} 
 + 
 +The tip/probe is mounted slightly in front micrometer screws 1 and 2.  Micrometer screw 3 is sitting very far back.  This makes a fulcrum with the screw 3 having even more fine adjust (factor 20).
  
 Thread pitch of micrometer screws (according to lab book 16.3.2012):  Thread pitch of micrometer screws (according to lab book 16.3.2012): 
-  * Front 0.25mm per revolution +  * Front (screws 1 and 2) 0.25mm per revolution 
-  * Back is hence 0.0125mm per revolution or 12.5µm +  * Back (screw 3) is hence 0.0125mm per revolution or 12.5µm 
  
 === Electronics === === Electronics ===
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   * [[http://www.joniemeyer.com/jo_niemeyer/STM.html|Project  „20 steps“  into the microcosmos — Jo Niemeyer (2009)]] ([[https://web.archive.org/web/20210518134908/http://www.joniemeyer.com/jo_niemeyer/STM.html|archive.org]])   * [[http://www.joniemeyer.com/jo_niemeyer/STM.html|Project  „20 steps“  into the microcosmos — Jo Niemeyer (2009)]] ([[https://web.archive.org/web/20210518134908/http://www.joniemeyer.com/jo_niemeyer/STM.html|archive.org]])
   * [[https://www.e-basteln.de/other/stm/overview/#start|Homebrew STM — Jürgen Müller (2006)]]   * [[https://www.e-basteln.de/other/stm/overview/#start|Homebrew STM — Jürgen Müller (2006)]]
-  * [[https://www.e-basteln.de/other/stm/references/|STM References Overview — Jürgen Müller (2006)]] 
  
 ==== Further resources ==== ==== Further resources ====
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   * [[https://gwyddion.net/|Gwyddion]] — Free SPM (AFM, SNOM/NSOM, STM, MFM, …) data analysis software   * [[https://gwyddion.net/|Gwyddion]] — Free SPM (AFM, SNOM/NSOM, STM, MFM, …) data analysis software
 +  * [[https://dberard.com/home-built-stm/links/|Useful Links]] — Dan Berard (2017)
 +  * [[https://www.e-basteln.de/other/stm/references/|STM References Overview]] — Jürgen Müller (2006)