Measurement of the switching properties of a regular 2-D array of Preisach-type particles

Martha Pardavi-Horvath, G. Vértesy

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

A two dimensional array of 42 μm square pixels has been etched from a highly uniaxial 3 μm thick magnetooptical garnet film. Each pixel has a rectangular hysteresis loop, characterized by 'up' and 'down' switching fields H+ and H-, coercivity and interaction fields, Hc and Hi. The distribution of Hc and Hi has been obtained by measuring hysteresis loops of individual pixels using an optical magnetometer. The distributions are found to be Gaussian, with the mean value coercivity Hc = 258 Oe and a standard deviation of coercivity of σc = 85 Oe. The mean interaction field Hi = 0 Oe with a standard deviation of σi = 9 Oe. The effect of the state of the magnetization of the surrounding 'particles' on a given pixel is characterized by dHi/dn = 26 Oe, where n is the number of first neighbors being already switched. The number of up and down magnetized pixels versus magnetic field was counted in a polarizing microscope equipped with a magnetizing coil and thus, the magnetization and the Preisach function can be determined directly, making the identification problem straightforward for this simple Preisach system.

Original languageEnglish
Pages (from-to)124-127
Number of pages4
JournalIEEE Transactions on Magnetics
Volume30
Issue number1
DOIs
Publication statusPublished - Jan 1994

Fingerprint

Pixels
pixels
Coercive force
coercivity
Hysteresis loops
standard deviation
Magnetization
hysteresis
magnetization
Garnets
Magnetometers
garnets
magnetometers
Microscopes
coils
microscopes
interactions
Magnetic fields
magnetic fields

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Measurement of the switching properties of a regular 2-D array of Preisach-type particles. / Pardavi-Horvath, Martha; Vértesy, G.

In: IEEE Transactions on Magnetics, Vol. 30, No. 1, 01.1994, p. 124-127.

Research output: Contribution to journalArticle

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