Regensburg 2004 – scientific programme
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DS: Dünne Schichten
DS 22: Postersitzung
DS 22.22: Poster
Tuesday, March 9, 2004, 14:30–17:00, Poster B
Magnetic properties and crystallinity of NiMn / FeNi(CoFe) bi-layer systems with different seed layers — •Stefka Groudeva-Zotova1, Reiner Kaltofen1, Dieter Elefant1, Volker Hoffmann1, Juergen Thomas1, Claus Schneider2, Wolfgang Michalke3, and Roland Mattheis3 — 1Leibniz Institut IFW-Dresden, Helmholtzstrasse 20, D-01069 Dresden — 2IFF-Forschungszentrum Juelich — 3IPHT Jena, Winzerlaerstr. 10, D-07745 Jena
This work presents an investigation of the influence of the seed layer on the structural and magnetic characteristics of AFM/FM systems 30nm NiMn / 4nm FeNi(CoFe) deposited by dc and rf magnetron sputtering of alloy targets. We compare bi-layers deposited on Ta, Cr and permalloy seed layers in different combinations and with variable thickness. The as-grown and the field-annealed and -cooled samples are characterised by GDOS depth-profile analysis for the film composition, by XRD and TEM for the crystalline structure and by MOKE and AGM measurements for the magnetic characteristics. A special accelerated post-deposition annealing and field-cooling procedure is used for the achieving a stable AFM state in the NiMn film and for generating an uni-directional anysotropy in the bi-layer AFM/FM system. It was found that the use of different seed layers results in the formation of NiMn films with different structural and morphological characteristics (phase composition, texture and crystallite grain size)which signicantly influence the magnetic characteristics of the respective annealed and field-cooled AFM/FM bi-layers.