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Article Dans Une Revue Nanotechnology Année : 2010

Growth, structure and magnetic properties of FePt nanostructures on NaCl(001) and MgO(001)

Résumé

A comparison of the structural and magnetic properties of FePt nanostructures grown at different temperatures on NaCl(001) and MgO(001) substrates is presented. A strong influence of the deposition temperature on the epitaxial growth as well as on the size distribution of FePt nanostructures grown on NaCl substrates is observed. In spite of a large lattice mismatch between FePt and NaCl, a 'cube-over-cube' growth of nanostructures with a narrow size distribution was achieved at 520 K. Moreover, the growth of FePt nanostructures on NaCl(001) is not preceded by the formation of a wetting layer as observed on MgO(001). The higher degree of L10 chemical ordering in FePt nanostructures grown on MgO(001) accompanied by the absence of L10 variants with an in-plane tetragonal c-axis indicates that the tensile epitaxial stress induced by the MgO substrate is a key factor in the formation of the L10 phase with an out-of-plane c-axis. Superparamagnetic behavior is revealed for the FePt nanostructures grown on NaCl(001) due to their small size and relatively poor chemical order.

Domaines

Matériaux

Dates et versions

hal-00457534 , version 1 (17-02-2010)

Identifiants

Citer

F. Liscio, D. Makarov, M. Maret, B. Doisneau-Cottignies, Hervé Roussel, et al.. Growth, structure and magnetic properties of FePt nanostructures on NaCl(001) and MgO(001). Nanotechnology, 2010, 21 (6), pp.065602. ⟨10.1088/0957-4484/21/6/065602⟩. ⟨hal-00457534⟩
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