Magnetization reversal of individual Co Nanoislands

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

研究成果: Article査読

35 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号107206
ジャーナルPhysical review letters
108
10
DOI
出版ステータスPublished - 2012 3月 9
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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