Interlayer coupling in Ni-Fe/Au/Co/Au multilayers

Feliks Stobiecki 1Maciej Urbaniak 1Maria Tekielak 2Bogdan Szymański 1Tadeusz E. Luciński 1Marek Schmidt 1Andrzej Maziewski 2

1. Polish Academy of Sciences, Institute of Molecular Physics, Mariana Smoluchowskiego 17, Poznań 60-179, Poland
2. University of Białystok, Laboratory of Magnetism, 41 Lipowa street, Białystok, Poland

Abstract

Previously we have demonstrated that sputter deposited (Ni80Fe20/Au/Co/Au)N multilayers (N-repetition number) exhibit easy-in-plane and out-of-plane magnetic anisotropy for permalloy and Co layers, respectively. Such structures are interesting because of possible applications as recording media or in magnetoresistive sensors with linear R(H) dependence. The perpendicular anisotropy of cobalt layers and the coupling between Co and Ni-Fe layers play a crucial role in both applications.

Two types of samples were studied: (i) sandwich structures with wedge shaped Au spacer and Co layers, (ii) multilayers with different thickness of Co (0.2 < tCo < 2 nm), Au (0.5 < tAu < 3 nm) layers and 5 < N < 15. The sandwich structures were investigated using multiscale magneto-optical methods based on the polar Kerr effect, whereas multilayers with VSM and magnetoresitance measurements (in our samples magnetoresistance effect of the GMR-type is observed). We have found that the Co layers exhibit perpendicular anisotropy in thickness range of 0.3 < tCo < 1.2 nm. For the Au spacer layer thickness tAu > 1 nm the interlayer coupling is weak and magnetization reversal of ferromagnetic layers is nearly independent. However, for multilayers exhibiting dense stripe domains structure (confirmed by MFM measurements) the ferromagnetic coupling strongly increases in the field range corresponding to the existence the domains structure.

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium D, by Feliks Stobiecki
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-23 16:26
Revised:   2009-06-07 00:44
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