Isotropic ferromagnetic resonance field shift in as-prepared permalloy/FeMn bilayers

Surfaces and Interfaces

Abstract.

Exchange-coupled wedged-permalloy (Py)/FeMn bilayers are studied by ferromagnetic resonance (FMR) technique at room temperature. In comparison, Py single layer films were also made. For Py single layer films and Py/FeMn bilayers, only one uniform resonance peak was observed at high magnetic fields, indicating no interfacial diffusion at the Py/FeMn and Py/Cu interfaces. Negative isotropic in-plane resonance field does exist in Py/FeMn bilayers and its magnitude increases with decreasing Py layer thickness. In order to explain above phenomena, interfacial perpendicular anisotropy must be considered simultaneously, in addition to irreversible rotation of spins in FeMn layers. This is because the perpendicular resonance field of the bilayers is larger than that of Py single layer films.

Keywords

Spectroscopy Magnetic Field Neural Network Anisotropy Layer Thickness 

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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Authors and Affiliations

  1. 1.Surface Physics Laboratory (State Key Laboratory) and Department of Physics, Fudan UniversityShanghaiChina
  2. 2.Department of PhysicsShanghai UniversityShanghaiChina
  3. 3.Center for Material Analysis and Measurements, Nanjing UniversityNanjingChina

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