Brillouin Zone Mapping of the Existence Conditions for Interface Bilayer Spin-Waves. Effects of the Configuration of the Film Magnetization

H. Puszkarskia,b, R. Józefowicza, B. Kołodziejczaka, A. Akjoujb, B. Djafari-Rouhanib and L. Dobrzynskib aSurface Physics Division, Physics Institute, A. Mickiewicz University, Matejki 48/49, 60-769 Poznań, Poland bLaboratoire de Dynamique et Structure des Matériaux Moléculaires, Unité Associée au CNRS 801, Université des Sciences et Technologies de Lille I, 59655 Villeneuve d'Ascq, Cedex, France.

Received: January 12, 1996

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For the two interface cubic cuts: sc(110) and sc(111) we consider the existence regions of interface spin-waves of a ferromagnetic bilayer film on the two-dimensional Brillouin zone as to their size and shape versus the respective interface related parameters (interface exchange coupling and intrinsic interface anisotropy) applying the approximation of a very thick bilayer film and the method of Brillouin zone mapping (the three (100) interface cubic orientations have been dealt with earlier [Phys. Rev. B 51, 16008 (1995)]). Of particular interest to us still remains the emergence of interface spin-waves induced by varying dynamic quantities such as the in-plane propagation wave vector k∥. Moreover, in our present investigation, we put especial emphasis on the effect exerted on the Brillouin zone mapping by varying (in the plane perpendicular to the film) the configuration angle 𝜗 of the film magnetization with respect to the film normal. We predict the existence of (at the most two) critical angles 𝜗c at which the interface spin-waves emerge. These critical angles are functions of the in-plane wave vector k∥ of interface spin-wave propagation along the interface. Finally, we discuss the effects due to the presence of critical angles with a view to their exploitation in experimental measurements.

DOI: 10.12693/APhysPolA.89.675 PACS numbers: 75.30.Ds, 75.70.Cn