Behavior of domain structure in a Co/Ag superlattice with dispersion of magnetic anisotropy |
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Authors: | L. M. Dedukh V. N. Matveev V. I. Nikitenko |
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Affiliation: | (1) Institute of Solid-State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia;(2) Institute of Microelectronic Technology and Ultrahigh-Purity Materials, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia |
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Abstract: | It is found that the magnetization reversal of an array of superthin Co films coupled by the ferromagnetic exchange interaction through the Ag layers may result in a domain structure of an unexpected new type. Due to the incoherent different-sense spin rotation upon lowering the field perpendicular to the easy axis, the specific macrodomains first form in a sample. They are separated not by the Neél domain wall but by a wide transition region containing high-density microdomains of sizes correlating with the grain sizes in the films. Further magnetization reversal proceeds through the formation of standard domain walls in the macrodomain in a magnetostatic field at the plate edge and through their shifting toward the transition region. These processes are explained with taking into account the character of the revealed magnetic anisotropy dispersion. |
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