afm
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| afm [2021/02/24 11:43] – [Replacing AFM Tips] mitchsenger | afm [2025/02/09 13:46] (current) – ethanminot | ||
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| *//See also: [[AFM upkeep]]// | *//See also: [[AFM upkeep]]// | ||
| - | New users on the AFM are expected to get AFM training and then pass the {{:: | + | New users of the AFM are expected to get AFM training and then pass the {{:: |
| To find answers to some of the quiz questions, the "AFM Manualette" | To find answers to some of the quiz questions, the "AFM Manualette" | ||
| *T: | *T: | ||
| Line 29: | Line 29: | ||
| ===== Learning The AFM ===== | ===== Learning The AFM ===== | ||
| - | New users on the AFM are expected to get AFM training | + | For an overview, you should first, spend 5 minutes reading |
| - | To find answers to some of the quiz questions, the "AFM Manualette" is a useful resource. | + | |
| + | A useful YouTube video ([[https:// | ||
| + | |||
| + | Training involves | ||
| + | - A session where you watch an experienced user (and ask questions) | ||
| + | - Reading the "AFM Manualette" | ||
| + | - A session where you "fly the AFM" with an experienced co-pilot talking you through each step. | ||
| + | - Take a written test to check that you understand the important concepts: | ||
| + | - A session where you " | ||
| + | |||
| + | The "AFM Manualette" | ||
| *T: | *T: | ||
| + | *Box folder "Minot Group Documents" | ||
| - | First, spend 5 minutes reading | + | With the AFM Manualette, there are some useful concept videos. I recommend watching The movies " |
| - | Second, watch a couple of the 30 second intro videos: T: | + | You must understand basic questions like |
| *how does the sample move in the x-y plane? | *how does the sample move in the x-y plane? | ||
| *how is the tip deflection measured? | *how is the tip deflection measured? | ||
| Line 42: | Line 53: | ||
| *what does the feedback circuit do? | *what does the feedback circuit do? | ||
| - | Third, get a comprehensive overview of how the system works by reading Chapter 5 of the manual | + | We use ac-mode imaging. So, it’s important to understand the basic idea of shaking a cantilever at its base to excite |
| - | T: | + | [[https://www.youtube.com/ |
| - | + | ||
| - | Fourth, spend some time watching an experienced person use it. Several aspects | + | |
| - | *lifting | + | |
| - | *using a pair of tweezer to change | + | |
| - | The only way to learn this dexterity is careful instruction from an experienced user. | + | |
| - | + | ||
| - | Then you are ready for a supervised training session where you operate | + | |
| - | + | ||
| - | The last step is to pass the {{::afm_training_quiz5.doc|AFM quiz}}. | + | |
| Line 58: | Line 60: | ||
| - Sign into the black notebook (on the table next to the AFM) | - Sign into the black notebook (on the table next to the AFM) | ||
| - | - Open version 16 of the AFM software (not version 14). It is critical that you use the correct version (switching between older/newer versions can corrupt the x-y stage calibration, | + | - Open version 16 of the AFM software (not version 14). It is critical that you use the correct version (switching between older/newer versions can corrupt the x-y stage calibration, |
| - | - Place the sample to be imaged on the tray | + | - Click the first option, " |
| - | - Raise the legs on the MFP-3D tripod to ensure the tip does not smash into the sample. | + | - Once software loads, set AC mode in master panel |
| + | - Place the sample to be imaged on the tray. Make sure that the stage x-y control thumbscrews are centered. | ||
| + | - Make sure the vibration isolation stage is on and isolation is enabled. | ||
| + | - Raise the legs on the MFP-3D tripod | ||
| - Set the MFP-3D over sample | - Set the MFP-3D over sample | ||
| - Align Laser: | - Align Laser: | ||
| - | * Turn on the camera - Click the lower left icon with a picture of a TV on it | + | * Turn on the camera - Click the lower left icon with a picture of a camera |
| * Turn on the camera light - Switch on the box which sits on top of the AFM | * Turn on the camera light - Switch on the box which sits on top of the AFM | ||
| * Align camera on cantilever - Two knobs sticking up at the very rear of the MFP-3D | * Align camera on cantilever - Two knobs sticking up at the very rear of the MFP-3D | ||
| Line 73: | Line 78: | ||
| - X Set AC Mode - In main tab of the master panel select 'AC Mode' in the ' | - X Set AC Mode - In main tab of the master panel select 'AC Mode' in the ' | ||
| - Tune the AFM | - Tune the AFM | ||
| - | * X Open ' | + | * Open ' |
| - | * X Set ' | + | * Set ' |
| - | * Click the 'Auto Tune' button | + | * Click the 'Auto Tune' button and wait for tuning to finish. Software will set drive frequency. |
| - | * X Click the peak of the newly displayed resonance peak and set it as the max amplitude | + | |
| - Engage the tip | - Engage the tip | ||
| - | * X Set the I gain to 10 | + | * Set the I gain to 10 |
| - | * Make the 'Set Point Voltage' | + | * Make the 'Set Point Voltage' |
| * Click ' | * Click ' | ||
| - | * Lower the tip (tripod thumbwheel) while watching the amplitude. The amplitude will drop as you near the surface. The computer will beep when feedback kicks in to stop the amplitdue | + | * Lower the tip (tripod thumbwheel |
| + | * If the Z-voltage goes down instead of up, re-tune. If that doesn' | ||
| * Lower the 'Set Point Voltage' | * Lower the 'Set Point Voltage' | ||
| * Lower the tip until the 'Z voltage' | * Lower the tip until the 'Z voltage' | ||
| Line 96: | Line 101: | ||
| - Manually retract tip from sample - Give the front thumbwheel a few clockwise twists | - Manually retract tip from sample - Give the front thumbwheel a few clockwise twists | ||
| - Turn off laser - Key on the AFM computer | - Turn off laser - Key on the AFM computer | ||
| - | - Turn off camera - Close camera window | ||
| - Turn off camera light - Switch on the box sitting on top of the AFM | - Turn off camera light - Switch on the box sitting on top of the AFM | ||
| - | - Place MFP-3D onto it' | + | - Place MFP-3D onto its shelf holder |
| - Remove sample | - Remove sample | ||
| + | - Close software and log out | ||
| - Leave controller and PC running unless expecting a power outage | - Leave controller and PC running unless expecting a power outage | ||
| ===== Imaging rules of thumb ===== | ===== Imaging rules of thumb ===== | ||
| Line 106: | Line 111: | ||
| **Beginner settings** | **Beginner settings** | ||
| *Scan size 1 micron | *Scan size 1 micron | ||
| - | *Scan rate 1 Hz | + | *Scan rate < 15 micron / s |
| *Integral gain 10 | *Integral gain 10 | ||
| *Free amplitude 1 V (~ 100 nm) | *Free amplitude 1 V (~ 100 nm) | ||
| Line 222: | Line 227: | ||
| For more specialized image analysis try [[http:// | For more specialized image analysis try [[http:// | ||
| + | |||
| + | [[http:// | ||
| ===== Supplies ===== | ===== Supplies ===== | ||
afm.1614195814.txt.gz · Last modified: 2021/02/24 11:43 by mitchsenger