Major loop reconstruction from switching of individual particles

Zheng, Guobao and Pardavi-Horvath, Martha and Vértesy, Gábor (1997) Major loop reconstruction from switching of individual particles. JOURNAL OF APPLIED PHYSICS, 81 (8). pp. 5591-5593. ISSN 0021-8979

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Abstract

Major hysteresis loops of groups of isolated 60 mm square garnet particles of a regular two-dimensional array, have been measured magnetooptically. Individual loops for each particle were measured, and the statistics of the distribution of coercivities and interaction fields was determined. It is shown that from the measured coercivity distribution and calculated magnetostatic interaction fields the major hysteresis loop can be reconstructed. The switching sequence, and the major loop of an assembly of 535 particles were calculated numerically for two cases: first, when calculating the magnetostatic interaction, the 25 particles were assumed to be isolated; second, the major loop of the same 25 particles, embedded into a 939 square, was reconstructed taking into account the interactions among all 81 particles. The numerically simulated major hysteresis loops agree very well with the measured loops, demonstrating the reliability of numerical modeling.

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