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Domain structure and magnetoresistance of NiFe/Au/Co/Au multilayers with perpendicular anisotropy

✍ Scribed by Maciej Urbaniak; Feliks Stobiecki; Dieter Engel; Bogdan Szymański; Arno Ehresmann; JinBae Kim

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
239 KB
Volume
3
Category
Article
ISSN
1862-6351

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✦ Synopsis

Abstract

The magnetic properties of sputtered [Ni~80~Fe~20~(2 nm)/Au(t ~Au~)/Co(t ~Co~)/Au(t ~Au~)]~15~ multilayers with t ~Au~ = 1.5‐3 nm and t ~Co~ =0.6‐1.5 nm were investigated with magnetic force microscope. The Ni~80~Fe~20~ layers possessed in‐plane magnetic anisotropy while the sandwiching of Co layers between Au layers ensured their perpendicular anisotropy through the influence of surface anisotropy. It led to the formation of a maze configuration of stripe domains. The stripe domains period λ strongly depends on t ~Co~ changing from 0.9 to 0.3 µm when t ~Co~ changes from 0.6 to 0.8 nm. Period λ increases with Au layers thickness, too. The values of stray fields originating from Co layers which act on Ni~80~Fe~20~ layers, in the range of 100 kA/m, estimated from magnetoresistive dependencies are in qualitative agreement with those evaluated from the model of infinitely long stripe domains with domain widths taken from MFM measurements. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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