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We report studies of magnetic properties in CoX A/Au60 A multilayers (X=5,6,7,8,12,20 A), which were prepared by sputtering on Si(111) substrates, with emphasis on the magnetization reversal. Magnetization reversal was investigated by measurements of initial magnetization curves, minor loops, coercivity as a function of the maximum field of minor loops, temperature dependence of magnetic properties using Kronmuller’s model, time decay of Kerr rotation angle ΘK, and the field‐sweep speed dependence of coercivity Hc(dHa/dt) at room and/or low temperature. It is found that (1) the thermal activation volumes determined by Hc(dHa/dt) increase from ∼2.0×10−17 to ∼9.9×10−17 cm3 as X varies from 5 to 20 A, which corresponds to a cylindrical activation volume with ∼800 A diameter. (2) A Kronmuller analysis together with the initial magnetization curves, etc., for a Co5 A/Au60 A sample at room and low temperature indicates that wall pinning with small pinning sites is the major coercivity mechanism. The interaction...

Magnetic properties and magnetization reversal in Co/Au multilayers (abstract)