Magnetization reversal of individual Co Nanoislands

S. Ouazi, S. Wedekind, G. Rodary, H. Oka, D. Sander, J. Kirschner

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


We investigate the magnetization reversal of individual Co islands on Cu(111) in the size range of N=700 to 18000 atoms by spin-polarized scanning tunneling microscopy at 8 K. The switching field H sw changes with island size in a nonmonotonic manner: it increases with island size and reaches a maximum value of 2.4 T at N=5500 atoms, and it decreases for larger islands. We extract the energy barrier for magnetization reversal as a function of island size. The maximum H sw corresponds to an energy barrier of 1 eV. Our results elucidate a crossover of the magnetization reversal from an exchange-spring behavior to domain wall formation with increasing size at around 7500 atoms.

Original languageEnglish
Article number107206
JournalPhysical Review Letters
Issue number10
Publication statusPublished - 2012 Mar 9


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