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Updated: Jul 2, 2026

Optimized Setup and Protocol for Magnetic Domain Imaging with In Situ Hysteresis Measurement
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Hall-effect hysteresigraph for amorphous bubble-domain materials.

A B Smith1, C T Burilla

  • 1Sperry Research Center, Sudbury, Massachusetts 01776, USA.

The Review of Scientific Instruments
|June 1, 1979
PubMed
Summary
This summary is machine-generated.

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A novel hysteresigraph rapidly measures amorphous bubble film coercivity using the Hall effect. This sensitive device accurately measures low coercivities, even on films with passivation layers.

Area of Science:

  • Materials Science
  • Solid State Physics
  • Magnetism

Background:

  • Amorphous bubble films are crucial for magnetic storage technologies.
  • Accurate measurement of magnetic properties like coercivity is essential for device performance.
  • Existing methods for measuring coercivity can be time-consuming and less sensitive.

Purpose of the Study:

  • To introduce a new hysteresigraph for rapid and sensitive measurement of amorphous bubble film coercivity.
  • To demonstrate the device's capability in measuring low coercivity values.
  • To enable measurements on films with insulating passivation layers.

Main Methods:

  • Utilized the Hall effect to sense film magnetization.
  • Developed a probe-contact arrangement for direct film measurement.

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Last Updated: Jul 2, 2026

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  • Designed the hysteresigraph for high sensitivity and stability.

    • Main Results:

    • Achieved significantly faster coercivity measurements compared to previous methods.
    • Successfully measured coercivities as low as approximately 1 Oe.
    • Enabled approximate inference of saturation magnetization from the hysteresis loop.
    • Facilitated measurements on films with insulating passivation layers.

    Conclusions:

    • The described hysteresigraph offers a rapid, sensitive, and versatile method for characterizing amorphous bubble films.
    • The device overcomes limitations of previous techniques, particularly for films with passivation layers.
    • This advancement facilitates the development and optimization of magnetic storage materials.