Interlayer interaction in multilayer [Co/Pt]n/Pt/Co structures

• DOI: 10.1063/1.4967163
• Publication Date: 2016-11-03T17:00:16Z
• Authors: E. S. Demidov; N. S. Gusev; L. I. Budarin; E. A. Karashtin; V. L. Mironov; A. A. Fraerman
• Keywords: Condensed Matter - Mesoscale and Nanoscale Physics; Mesoscale and Nanoscale Physics (cond-mat.mes-hall); 0103 physical sciences; FOS: Physical sciences; 01 natural sciences

We report a study of interlayer exchange interaction in multilayer [Co/Pt]n/Pt/Co structures. The structures consist of a periodic [Co/Pt]n multilayer film with a perpendicular anisotropy and a thick Co layer with an in-plane anisotropy. The subsystems are separated by a Pt spacer with variable thickness. The magnetooptical Kerr effect and the ferromagnetic resonance measurements show the essentially non-collinear state of magnetic moments of the layers and strong exchange coupling between the [Co/Pt]n and the Co subsystems. A simple model based on the Landau-Lifshitz-Gilbert equation shows that the exchange coupling is ferromagnetic. The exchange constant is estimated in this simple model. The estimated value is J=2 erg/cm2.