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 20.65: Poster

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

Magnetic properties of FePt based exchange coupled films — •Felix Kurth, Martin Weisheit, Sebastian Fähler, and Ludwig Schultz — Institute for Metallic Materials, IFW Dresden, Helmholtzstr. 20, D-01069 Dresden

FePt is a promising material for future high density magnetic recording, due to its high magnetocrystalline anisotropy and therefore higher thermal stability at smaller grain size compared to currently used materials. However, high anisotropy results in prohibitively high coercivity, which currently prevents the use of this material due to the limited switching field of write heads. One way to decrease coercivity while only moderately affecting the thermal stability is to couple the hard magnetic FePt film to a soft phase, like Fe or FeCo. This has been shown theoretically [1]. Here we present first results on the properties of FePt/Fe and FePt/FeCo bilayers prepared by pulsed laser deposition. The influence of deposition parameters, e.g. substrate temperature, on the surface morphology and crystallographic structure and their effect on the magnetic properties is discussed.

[1] D. Suess, T. Schrefl, S. Fähler, M. Kirschner, G. Hrkac, F. Dorfbauer, and J. Fidler, Appl. Phys. Lett. 87 (2005) 012504