5-66
TMPM5200-2
ard the
■
Observing an MFM image
FM (Magnetic Force Microscope) measurement using a dedicated
if y
net. You can
sually perform MFM observation using the AC mode. To separate a topographic image
the cantilever from the specimen in the position where a
t e
e element); line-by-line lifting (lifting at every line) is also optionally
.
rement has been
frequently moves
•
Line by Line Lift Mode (L_Lift)
ned for measure-
his mode, compara-
tively stable images can be obtained.
Topographical image
In MFM image observation, it is essential that the topographical image of a sample
can be observed clearly and sharply in AC mode. Observe the topographical image
in the AC mode in advance to find out the best observation condition. To do this,
click on the Retract On button and then carry out the same procedure as in Section
5.4.2, “Image observation and lift setting.”
MFM im
1.
2.
anning and enter the parameters as follows;
a.
Select 2 Inputs from the Acquisition selection pull-down menu in the Scan
frame of the Advanced tab window.
Setting Reference/V
Set the distance between the specimen and the cantilever tip using
Reference/V. Normally, while observing an image from a separated position,
gradually move the cantilever tip toward the 0 V side (the direction tow
specimen), and set it in the optimum position so that the best image can be
photographed.
If the RMS value reads –5.6 V (the preset voltage setting at which the cantile-
ver separates completely), this indicates that the cantilever tip is too far from
the specimen. If the RMS value reads 0 V, this indicates that the cantilever tip
has collided with the specimen surface.
You can carry out M
cantilever for MFM measurement. It should be noted that better results might be obtained
ou magnetize the MFM cantilever beforehand using a permanent mag
u
from an MFM image, lift
topographic image is acquired. Then the phase difference of the cantilever will be
displayed as an MFM image. The standard system provides point-by-point lifting (lifting
very pictur
a
available
•
Point by Point Lift Mode (P_Lift)
In this mode, the cantilever is lifted at every point where measu
performed. If, however, you want to carry out the measurement under vacuum using
this mode, you can carry out measurement only with a loss of the stability in the
topographical image, and in the MFM image since the cantilever
up and down.
In this mode, the cantilever is lifted each time a line has been scan
ment. Since the movement of the cantilever is less frequent in t
age
Obtain a desirable topographical image (see Section 5.4.2).
Stop sc
b.
Select P_Lift or L_Lift from the Mode selection pull-down menu.
