JEOL JSPM-5200 Instructions Manual page 212

■ Current image observatio
The operation procedures for image observation in the STM mode that have been
explained so far in this section are for the constant-current STM mode used to observe
the topography of a specimen while keeping the tunneling current constant. In this mode
it is also possible to observe a current image by obtaining the change of the current as an
image while keeping the tip height constant. The following is the procedure for
observing a current image.
1.
Click on the
window of the SPM Parameters window, and then select 2 Inputs (512) or 2
Inputs from the pull-down menu.
This action acquires two images and displays them simulta
a current image, you usually acquire the topography image of the specimen and
compare it with the
2.
Click on the
Advanced tab window of the SPM Parameters w
Current from the pull-down menu.
For current-image observation, use Log Current instead of Linear Current.
3.
Click on the
0.1 to 0.2 from the pull-down menu.
Usually, a current image is observed by applying a very slow feedback while
keeping the height constant. Use a slower response for the feedback than that used
for observing a topography image.
4.
Click on the Repeat button on the Advanced tab window of the SPM
Parameters window.
Scanning will start an
TMPM5200-2
n
button in the Acquisition selection box on the Advanced tab
current image.
button in the Display Source 2 selection box on the
button in the Fback Filter/Hz selection box, and then select
d an image will appear in the Display Window.
５ MEASUREMENT OPERATION
neously. When o bserving
indow, and then select Log
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