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      Room temperature sub-micron magnetic imaging by scanning hall probe microscopy

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      Author(s)
      Sandhu, A.
      Masuda, H.
      Oral, A.
      Bending, S. J.
      Date
      2001
      Source Title
      Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
      Print ISSN
      0021-4922
      Publisher
      Japan Society of Applied Physics
      Volume
      40
      Issue
      6B
      Pages
      4321 - 4324
      Language
      English
      Type
      Article
      Item Usage Stats
      204
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      196
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      Abstract
      An ultra-high sensitive room temperature scanning Hall probe microscope (RT-SHPM) system incorporating a GaAs/A1GaAs micro-Hall probe was used for the direct magnetic imaging of localized magnetic field fluctuations in very close proximity to the surface of ferromagnetic materials. The active area, Hall coefficient and field sensitivity of the Hall probe were 0.8 μm×0.8 μm, 0.3 Ω/G and 0.04 G/√Hz, respectively. The use of a semiconducting Hall probe sensor enabled measurements in the presence of externally applied magnetic fields. Samples studied included magnetic recording media, demagnetized strontium ferrite permanent magnets, and low coercivity perpendicular garnet thin films. The RT-SHPM offers a simple means for quantitatively monitoring sub-micron magnetic domain structures at room temperature.
      Keywords
      Garnets
      Hall probe sensor
      Magnetic domains
      Magnetic imaging
      Magnetic recording media
      Scanning Hall probe microscopy
      Ferromagnetic materials
      Floppy disk storage
      Garnets
      Magnetic bubbles
      Magnetic domains
      Magnetic field effects
      Magnetic hysteresis
      Magnetization
      Optical microscopy
      Scanning
      Thin films
      Magnetic imaging
      Scanning hall probe microscopes (SHPM)
      Imaging techniques
      Permalink
      http://hdl.handle.net/11693/24856
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      • Department of Physics 2485
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