Abstract

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.

Notes

Originally published in Journal of Applied Physics 99, 08C901 (2006). DOI:10.1063/1.2163843 (http://dx.doi.org/10.1063/1.2163843).

Keywords

microwave properties, CoFe, PtMn, CoFe, multilayer films, Ru, NiFeCr, Co-10, Co-16, FMR

Subject Categories

Magnetic properties, Ferromagnetic resonance, Anisotropy

Disciplines

Electromagnetics and photonics

Publisher

American Institute of Physics

Publication Date

4-15-2006

Rights Information

Copyright 2006 American Institute of Physics.

Rights Holder

American Institute of Physics


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mag_micro_prop_cofe_ptmn_cofe_fig1.ppt (33 kB)
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mag_micro_prop_cofe_ptmn_cofe_fig3.ppt (24 kB)
Figure 3

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