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Interdiffusion of two L10 phases without order decrease : experiments and molecular dynamics simulations

Christine Goyhenex 1Romaric V. Montsouka 1Mirosław Kozłowski 2Véronique Pierron-Bohnes 1

1. Institut de Physique et Chimie des Materiaux de Strasbourg, UMR7504, CNRS - ULP, 23, rue du Loess, BP 43, Strasbourg CEDEX 2 67034, France
2. Jagiellonian University, Institute of Physics (IF UJ), Reymonta 4, Kraków 30-059, Poland


The L10 ordered MPt(0 0 1) thin films (M = Fe or Co) are very interesting for perpendicular recording due to their magnetic anisotropy and magneto-optical behaviors. Nevertheless, in this type of recording, the problem remains, since the strong magnetic anisotropy involves a high coercive field, difficult to overcome with a miniaturized writing head. (Fe-Ni)50Pt50 thin films consist in a good compromise to decrease the coercivity and the Curie temperature keeping large enough remanent magnetization and magnetic anisotropy.

Epitaxial L10-ordered NiPt(0 0 1) / FePt(0 0 1) bi-layers were co-deposited on MgO(1 0 0) substrates by MBE. The L10 order parameter is high with the concentration modulation along the growth direction. Some FeNiPt2(0 0 1) thin films were obtained by interdiffusion of the bi-layers. The L10 order parameter is conserved after interdiffusion, which can be explained by different mechanisms:

- a second neighbor jump,

- a six jump cycle mechanism,

- a double vacancy diffusion,

- a triple defect mechanism.


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Presentation: Oral at E-MRS Fall Meeting 2006, Symposium H, by Véronique Pierron-Bohnes
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-12 17:06
Revised:   2009-06-07 00:44