Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)

MA 13.55: Poster

Dienstag, 9. März 2004, 15:00–19:00, Bereich A

Magneto-Transport Properties of Multilayer Antidot Arrays — •Kornelius Nielsch, Fernando J. Castaño, and Caroline A. Ross — Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA

The magneto-transport properties of Pseudo-spin-valve (PSV) thin film structures grown onto sub-200 nm porous alumina templates have been investigated. Hexagonal and quadratic pore arrangements were achieved by defining a grid in silicon substrates using a combination of interference lithography and reactive ion etching. An aluminum layer was then evaporated and anodized, resulting in large area porous structures with interpore distance of 180 nm (quadratic lattice) and 208 nm (hexagonal lattice) and a pore diameter ranging from 80 to 150 nm. The PSV antidot arrays were fabricated by depositing NiFe/Cu/CoFe thin film structures onto the alumina templates. The room temperature hysteresis loops of the antidot structures show the distinct switching of both soft and hard magnetic layers, as well as a significant shearing of the loop, as compared with that of the PSV thin film structure on a Si substrate. Magnetic anisotropies induced by the different arrangements will be discussed. Surprisingly the giant magnetoresistance ratio of the PSV antidot arrays is only slightly smaller than that of the PSV thin film structure.