Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 16: Micro- and Nanostructured Magnetic Materials II
MA 16.2: Vortrag
Dienstag, 28. März 2006, 12:00–12:15, HSZ 103
Magnetic anisotropy and tunneling anisotropic magnetoresistance in CoPt systems. — •Alexander Shick1, Franišek Maca1, Jan Mašek1, and Tomas Jungwirth2,3 — 1Institute of Physics ASCR, Na Slovance 2, 182 21 Praha 8, Czech Republic — 2Institute of Physics ASCR, Cukrovarnická 10, 162 53 Praha 6, Czech Republic — 3School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK
First principles full-potential linearized augmented plane wave (FP-LAPW) calculations are used to investigate the magnetic anisotropy energy (MAE) and tunneling anisotropic magnetoresistance (TAMR) for several model systems ranging from simple hcp-Co to more complex ferromagnetic structures with enhanced spin-orbit coupling, namely bulk and thin film L10-CoPt ordered alloys and a monatomic-Co wire at a Pt surface step edge. Based on ab initio calculations of the anisotropy in the density of states we predict sizable TAMR effects in CoPt-based metallic ferromagnets. This opens prospect for new spintronic devices with a simpler geometry as these do not require antiferromagnetically coupled contacts on either side of the tunnel junction. We also investigate the relation between the TAMR and MAE, and evaluate reliability of the predicted density of states anisotropies by comparing quantitatively our ab initio results for the magnetocrystalline anisotropies in these systems with experimental data.