5991-3185EN Magnetic Force Microscopy Studies Using the Keysight 7500 AFM - Application Note c201410 part of Agilent 5991-3185EN Magnetic Force Microscopy Studies Using the Keysight 7500 AFM - Application Note c201410 5991-3185EN Magnetic Force Microscopy Studies Using the Keysight 7500 AFM - Application Note c201410, Agilent 5991-3185EN Magnetic Force Microscopy Studies Using the Keysight 7500 AFM - Application Note c20141020 [4].pdf text manual preview

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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