Magnetic resonance studies of the fundamental spin-wave modes in   individual submicron Cu/NiFe/Cu perpendicularly magnetized disks
  Spin wave spectra of perpendicularly magnetized disks with trilayers consisting of a 100 nm permalloy (Py) layer sandwiched by two Cu layers of 30 nm, are measured individually with a Magnetic Resonance Force Microscope (MRFM). It is demonstrated by 3D micromagnetic simulations that in disks having sub-micron size diameters, the lowest energy spin wave mode of the saturated state is not spatially uniform but rather is localized at the center of the Py/Cu interface in the region of a minimum demagnetizing field. 
G. De Loubens (SPEC), V. V. Naletov (SPEC), Olivier Klein (SPEC), J.   Ben Youssef (LMB), F. Boust (DMSC), N. Vukadinovic (G...