Magnetic and microwave properties of CoFe/PtMn/CoFe multilayer films
Originally published in Journal of Applied Physics 99, 08C901 (2006). DOI:10.1063/1.2163843 (http://dx.doi.org/10.1063/1.2163843).
CoFe/PtMn/CoFe films were deposited on seed layers of Ru or NiFeCr with CoFe film compositions being either Co-10 at. %Fe or Co-16 at. %Fe. Eight periods of the CoFe/PtMn/CoFe trilayers were also prepared. The magnetic properties and ferromagnetic resonance (FMR) of these films were characterized with vibrating-sample magnetometer, and field-sweep FMR system at X band (∽9.5 GHz). The Ru-seeded CoFe/PtMn/CoFe sandwich films show excellent magnetic softness with a low hard axis coercivity of 2-4 Oe, an easy axis Mr/Ms of >98%, and a significantly enhanced in-plane anisotropy of 57-123 Oe when CoFe layer thickness is above 200 Å. Contrary to what was observed in the ferromagnetic/antiferromagnetic bilayer systems that have reduced FMR linewidth with the increase of film thickness, the CoFe/PtMn/CoFe trilayers with Ru seed layer show a minimum FMR linewidth of 45 Oe at an intermediate CoFe layer thickness of 300 Å at ∽9.5 GHz.
C. I. Pettiford, A. Zeltser, S. D. Yoon, V. G. Harris, C. Vittoria, and N. X. Sun. "Magnetic and microwave properties of CoFe/PtMn/CoFe multilayer films" Electrical and Computer Engineering Faculty Publications (2006).
Available at: http://works.bepress.com/cvittoria/118