Dresden 2003 – wissenschaftliches Programm

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MA: Magnetismus

MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)

MA 14.51: Poster

Dienstag, 25. März 2003, 15:15–19:15, Zelt

INFLUENCE OF THE DEPOSITION CONDITIONS ON THE MAGNETIC AND STRUCTURAL CHARACTERISTICS OF NiO/FeNi BILAYER SYSTEMS — •S. Groudeva-Zotova^1,2, R. Kaltofen¹, D. Elefant¹, D. Tietjen¹, and C.M. Schneider¹ — ¹IFW-Dresden, PF 270016, D-01171 Dresden — ²IE-BAS, Sofia, BG

A systematic study of NiO/FeNi bilayers is performed in order to optimise the characteristics of spin valve systems based on polycrystalline NiO films. Three groups of films deposited at RT by rf magnetron sputtering have been investigated: samples deposited in external magnet field, samples deposited without magnet field, and samples deposited without magnet field but additionally annealed and cooled at H_ext = 1.2 T. The influence of the main deposition parameters on the measured H_EB and H_c is investigated systematically and the following optimal conditions for obtaining stable systems with H_EB = 95 Oe and T_bl ≈ 200^∘C are found: p_Ar ≤ 7,5x10⁻⁴ mbar, v_dep = 8 nm/min and d_NiO = 50 nm. The structural characteristics of the NiO films show the coexistence of two crystalline phases (paramagnetic fcc phase and afm rhombohedral phase) in the entire investigated intervals and a significant influence of the deposition parameters on the relative amount, the texture and the crystallite size of these phases. This yelds the opportunity to find direct correlation between the magnetic and the structural film characteristics and to explain the optima found in the magnetic parameters.