Regensburg 2002 – wissenschaftliches Programm

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MA: Magnetismus

MA 10: Poster : Dünne Schichten(1-21),Spinabh.Transp.(22-39),Exch.Bias(40-51),Spindyn.(52-55),Mikromag.(56-66),Partikel(67-74),Abb.Verf.(75-77),Oberfl.+Spinelektr.+Elektr.Theo+Mikromag(75-87),PÜ+Aniso+Werkst/Leg.(88-103),Mol.Mag.+N-dim+Messm.+Postdead(104-111

MA 10.42: Poster

Dienstag, 12. März 2002, 15:00–19:00, Bereich A

INFLUENCE OF A PERMALLOY SEED LAYER ON THE STRUCTURE AND MAGNETIC CHARACTERISTICS OF EXCHANGE BIASING SYSTEMS BASED ON NiMn FILMS — •S. Groudeva-Zotova^1,2, D. Elefant¹, R. Kaltofen¹, J. Thomas¹, and C. Schneider¹ — ¹Institute for Solid State and Materials Research IFW Dresden, PF 27 00 16, D-01171 — ²Institute of Electronics, BAS, Sofia, Bulgaria

Understanding the exchange biasing (EB) mechanisms is crucial for a successful engineering of GMR-based magnetic sensors.This includes also the phase formation in the afm pinning films.

Two afm-fm EB systems were grown by rf magnetron sputtering - with and without (111) textured permalloy seed layers. The effect of the sputtering conditions and post-deposition annealing parameters were studied by XRD, TEM, MOKE and AGM. The results yelded optimised deposition conditions and helped to establish an efficient field annealing procedure. The resulting samples exhibit a stable fct structure, saturation in Hc and Heb, and Hc and Heb values comparable to available data. The films without permalloy seed layer reveal higher coercivity and exchange bias fields (Hc = 65 Oe and Heb = 85 Oe) than the films with seed layer (Hc = 35 Oe,Heb = 60 Oe. However, the systems with highly textured seed layer need a much shorter field-annealing treatment. In both cases, the exchange bias Heb is stable in air to T>200oC.