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

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2 Author(s)
Pardavi-Horvath, M. ; Inst. for Magnetics Res., George Washington Univ., Washington, DC, USA ; Vertesy, Gabor

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

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Magnetics, IEEE Transactions on  (Volume:30 ,  Issue: 1 )