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 20.91: Poster

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

Competition between shape anisotropy and magnetoelastic anisotropy in Ni nanowires electrodeposited within alumina templates — •Amit Kumar, Sebastian Fähler, Heike Schlörb, Karin Leistner, and Ludwig Schultz — IFW Dresden

Ordered arrays of magnetic nanowires deposited in porous alumina are attracting increasing interest due to potential applications in high density magnetic storage or in micro electromechanical systems. We have produced self-assembled nanopores in alumina on Al and filled them with Ni using AC electrodeposition. Due to the high aspect ratio, the magnetization lies preferentially along the wire axis and a strong magnetic anisotropy is observed. Temperature dependent measurements show an unexpected decrease of out-of-plane coercivity at lower temperatures. A model is proposed that takes into account the magnetoelastic anisotropy induced in the wire during cooling. Due to the difference in thermal expansion of Ni, alumina and Al, stresses are induced in the Ni wire during cooling. The resulting magnetoelastic anisotropy is acting opposite to the shape anisotropy and can well explain the experimental results.