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Helping Solve Processing and Materials  Problems using Scanning Probe Microscopy since 1990.

CD stamper bumps, perspective view

 

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Home
: Products and services for AFM, STM, and SEM
: Applications of AFM and STM
   : CD
   : DVD
   : HD-DVD
   :Blu-Ray
   : Hard Disks
   : Magnetic Tape
   : More
: Pharmaceutical materials
     : Collagen fibers
     : Collagen monomers
     : DNA Plasmids
   : Polymer molecules
   : Orthopedic implants
   : Opthamalic Devices
   : Diagnostic devices
   : And More
   : Powders
   : Naturally occurring (cellulose)
   : Blends
   : Copolymers
   :Homopolymers
   : Material domains
   : Paper
   : Packaging materials
   : Cast, extruded, or molded polymers
: Coatings
   : Paint
   : Paper finishing
   : Can coatings
: Electronic Materials
   : Silicon
   : Silicon Carbide
   : Germanium
   : Gallium Arsenide
   : Wafers
   : Thin Films
: Automotive
   : Corrosion
   : Wear
: Energy Technologies
   : Corrosion
   : Calalysts
: New materials including ultra high strength magnets
: Optics & Photonics
   : Diffraction Gratings
   : Modified surfaces
   : superpolished optics
   : Ultrasmooth surfaces
   : IR
   : Visible Light
   : UV
   : X-Ray
: Telecommunications

: Metals

:Gallery of interesting images

:Links

 

Track Pitch Variation

MagneTrackTM measures MFM images.

To put more data on a disk, you must decrease track pitch.  But when the tracks are too close together, cross-talk causes data errors.  In an ideal disk drive, the servo marks are placed at equal radial intervals and the tracking servo responds perfectly to those marks; the track spacing can be as small as allowed by the magnetic performance of the media and the head.  In a real drive, track pitch variation requires an increase (added tolerance) in the target track pitch.  Now you can analyze Magnetic Force Microscope (MFM) images to obtain this information directly, with nanometer-scale accuracy, without relying on an indirect calibration.

MFM image of matnetic recording disk
MFM image of data bits on a hard disk  The Magnetic Force Microscope senses the magnetic field just above the disk surface.  20 micron scan.

Track Pitch on magnetic recording disk measured on MFM image with DiscTrack Plus
Track Pitch results from 4 MFM images in the data region of a hard disk.  The standard deviation of track pitch is a tool used by disk design engineers to set track pitch target values in each generation of disk drive.

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