User`s guide

Introduction to the Agilent 5500 1
Agilent 5500 SPM User’s Guide 26
amplitude—this reduction is used as a feedback signal to maintain
constant amplitude of the cantilever motion. (Figure 7).
Figure 7 Acoustic AC mode (AAC)
Magnetic AC (MAC) Mode
In Magnetic AC (MAC) Mode AFM, the back side of the cantilever is
coated with magnetic material. A solenoid applies an AC magnetic field
which is used to oscillate the cantilever. (Figure 8). MAC Mode is
typically cleaner and gentler than Acoustic AC Mode and is free from
spurious background signals that are somewhat common when AAC
Mode. The benefits are particularly pronounced when imaging in liquid.
NOTE
Acoustic AC Mode is an option for the 5500 SPM and requires the
additional Mac Mode or MAC III controller.
NOTE
MAC Mode is an option for the 5500 SPM and requires the additional
MAC Mode or MAC III controller.