Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.85: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Experimental realization of a model system for a two-dimensional two-phase magnet — •Sven Schnittger¹, Sebastian Dreyer¹, Christian Jooss¹, and Sibylle Sievers² — ¹Institut für Materialphysik, Universität Göttingen — ²Physikalisch-Technische Bundesanstalt, Braunschweig

Two-phase magnets play an important role in the production of permanent magnet applications; especially the interplay of the different magnetostatic interactions is of great interest. In this contribution, the fabrication of a model system for a two-dimensional two-phase ferromagnet is presented. The sample consists of patterned hard magnetic structures (L1₀-CoPt) embedded in a soft magnetic film (Permalloy, Fe₁₉Ni₈₁). The size, the number and the distribution of the structures in the film as well as their spacing are varied. The fabrication process is done as follows: a magnetron-sputtered CoPt film on a (100)-MgO substrate is structured by electron beam lithography. The negative structure is etched into the film by reactive ion etching using an aluminum mask. The permalloy film is deposited by electron beam evaporation. The magnetic characterization is mainly accomplished by the magneto-optical indicator film technique using the Faraday Effect and by magnetic force microscopy. First results concerning the size-dependent remagnetization behaviour are presented.