Reentrant surface anisotropy in the antiferromagnetic/ferromagnetic bilayer Mn/Co/Cu (001)

M. Caminale*, R. Moroni, P. Torelli, W. C. Lin, M. Canepa, L. Mattera, F. Bisio


研究成果: 雜誌貢獻期刊論文同行評審

8 引文 斯高帕斯(Scopus)


We investigated the magnetic anisotropy energy of monatomic surface-step atoms in antiferromagnetic/ferromagnetic (AF/FM) epitaxial Mn/Co bilayers grown on vicinal Cu(001) surfaces. The step-induced anisotropy of the Co/Cu(001) films was quenched upon submonolayer Mn deposition, but a reentrant uniaxial surface anisotropy was observed for Mn thickness (tMn) between 1 and 2 monolayers, which disappears for Mn thickness above 2 monolayers. In the Mn/Co/Cu(001) system, Mn films undergo a tMn-dependent transition from FM to AF in the 1-2 Mn monolayer thickness range, which entails the coexistence of FM and AF Mn phases in the film. The observation of a sizeable uniaxial anisotropy exclusively in the Mn-thickness range of coexistence of the FM and AF phases points out the crucial role of the boundaries between FM and AF regions within the Mn film. A symmetry-breaking mechanism of a magnetic type, rather than a purely geometric one, is therefore proposed as the origin of the reentrant anisotropy.

期刊Physical Review Letters
出版狀態已發佈 - 2014 1月 23

ASJC Scopus subject areas

  • 物理與天文學 (全部)


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