afm
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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| afm [2021/02/24 11:42] – [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' | ||
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| - 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 162: | Line 167: | ||
| - Remove a new cantilever from the box with a pair of plastic tweezers using a twisting motion - be careful not to touch the end with the tip! Grab the new cantilever with your tweezers so the end you want to insert into the tip holder is pointing away from you and the tip is pointing upwards. | - Remove a new cantilever from the box with a pair of plastic tweezers using a twisting motion - be careful not to touch the end with the tip! Grab the new cantilever with your tweezers so the end you want to insert into the tip holder is pointing away from you and the tip is pointing upwards. | ||
| - Slide the tip between the tip holder and the clamp (probably just as the old one was placed). The cantilever should be placed so it isn't inserted too far or too short. Too far, and the tip will not be well situated in the holder and zeroing the deflection will be impossible (see the figure below). | - Slide the tip between the tip holder and the clamp (probably just as the old one was placed). The cantilever should be placed so it isn't inserted too far or too short. Too far, and the tip will not be well situated in the holder and zeroing the deflection will be impossible (see the figure below). | ||
| - | - Once the tip is inserted properly, tighten the clamp and replace the holder in the AFM head. | + | - Once the tip is inserted properly, tighten the clamp and replace the holder in the AFM head. Make sure to rotate the AFM head in the opposite direction you used to invert the head, to avoid twisting the head cable. |
| - Test the tip insertion two ways: i) Make sure the laser spot can be placed on the tip and the deflection can be zeroed without placing the wheels at their maximum range. ii) Auto tune the AFM, and make sure the amplitude and phase plots are free of any irregularities. | - Test the tip insertion two ways: i) Make sure the laser spot can be placed on the tip and the deflection can be zeroed without placing the wheels at their maximum range. ii) Auto tune the AFM, and make sure the amplitude and phase plots are free of any irregularities. | ||
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| For more specialized image analysis try [[http:// | For more specialized image analysis try [[http:// | ||
| + | |||
| + | [[http:// | ||
| ===== Supplies ===== | ===== Supplies ===== | ||
afm.1614195741.txt.gz · Last modified: 2021/02/24 11:42 by mitchsenger