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MA: Fachverband Magnetismus

MA 29: Micro- and Nanostructured Magnetic Materials

MA 29.11: Talk

Wednesday, March 13, 2013, 17:45–18:00, H23

Fabrication of high-density magnetic storage elements bylow-dose ion beam irradiation — •Roland Neb¹, Thomas Sebastian¹, Philipp Pirro¹, Stefan Pofahl², Rudolf Schaefer², Bernhard Reuscher³, and Burkard Hillebrands¹ — ¹Fachbereich Physik and Research Center Optimas, TUKaiserslautern, 67663 Kaiserslautern, Germany — ²Leibniz-Institutfür Festkörper- und Werkstoffforschung Dresden, IFW Dresden, 01069 Dresden,Germany — ³Institut für Oberflächen- und Schichtanalytik,IFOS, 67663 Kaiserslautern, Germany

A new scheme of fabricating magnetic storage elements is proposed. We irradiate an antiferromagnetically coupled Fe/Cr/Fe trilayer with a focused low-dose 30 keV Ga⁺-ion beam. The irradiation leads to ferromagnetic coupling in the affected areas, rendering them capable of storing information. The working principle is demonstrated for a storage array with a bit density of 7 Gbit/inch². We also investigate the possibilities of increasing the bit density by numerical simulation and theoretical calculation, showing that from a physical point of view bit densities of over 1 Tbit/inch² are feasible.