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Keysight Technologies
Magnetic Force Microscopy Studies
Using Keysight 7500 AFM




        Application Note




                   Introduction
                   Magnetic force microcopy (MFM) is a mode derived from
                   AFM for probing mechanical properties of materials. The
                   key requirement of this technique is the separation of the
                   response caused by long-range magnetic interactions from
                   the response due to short-range topographic interactions.
                   In order to achieve that, MFM is operated in a two-pass
                   way. A irst scan is taken to obtain the surface morphol-
                   ogy, followed by positioning the magnetized tip at a certain
                   distance above the sample. Qualitative mapping of a
                   sample's magnetic domains is obtained in the second pass
                   (phase image) by guiding the tip along the surface contour
                   acquired in the irst scan. Magnetic media is commonly
                   used to store data. This application brief presents a few ex-
                   amples of examining material's magnetic properties of data
                   storage devices as well as some other materials using the
                   Keysight Technologies, Inc. 7500 atomic force microscope.
02 | Keysight | Magnetic Force Microscopy Studies Using Keysight 7500 AFM - Application Note



Identifying Magnetic Domains
Using MFM Imaging
The irst sample selected in our MFM stud-
ies is the traditional Sony Hi8 video tape.
Shown in Figure 1 are both topography and
simultaneously collected MFM images that
could be routinely acquired from this mate-
rial. In contrast to the surface morphology
that only exhibits a smooth background in
conjunction with many randomly distrib-
uted nanoparticles, long-range zigzag
patterning of magnetic domains are clearly
resolved in the MFM data. Furthermore,
it is worthy to point out that a few surface              Figure 1. MFM imaging of Sony Hi8 video tapes. Both topographic image (left) and the corresponding
contamination locations (i.e., those protru-              MFM image (right) are acquired simultaneously. Scan size: 20

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