Europhys. Lett., 56 (1) , pp. 132-137 (2001)
Proximity-induced short-range spin density wave order in Fe/Cr multilayersM. Avignon1, V. Menshov2 and V. Tugushev1, 2
1 Laboratoire d'Etudes des Propriétés Electroniques des Solides Associated with Université Joseph Fourier, CNRS BP 166, 38042 Grenoble Cedex 9, France
2 Russian Research Center "Kurchatov Institute" Kurchatov Square, 123182 Moscow, Russia
(Received 22 January 2001; accepted in final form 19 July 2001)
To describe the magnetic phase diagram of Fe/Cr multilayers we propose an approach based on the Ginzburg-Landau expansion of the free energy in terms of a spin density wave (SDW) order parameter which is determined self-consistently. This approach shows the existence of short-range order with a characteristic width D close to the interfaces. Although not homogeneous this phase resembles the commensurate SDW identified in neutron experiments and determines the observed high-temperature transition temperature T1. The dependence of T1 on the Cr thickness L is in agreement with the experimental behaviour and the length 2D can be identified with the critical Cr thickness for the existence of the incommensurate SDW.
75.70.Cn - Interfacial magnetic properties (multilayers).
75.30.Fv - Spin-density waves.
© EDP Sciences 2001