dimensional magnetic fields of nanoscale elements determined by electron-holographic tomography
The permalloy patterned films, kindly provided by Dr KJ Kirk and Prof JN Chapman (University of Glasgow), were fabricated by electron beam lithography and lift-off patterning onto silicon nitride membranes. Holography experiments were carried out on the Philips CM300 FEGTEM at Cambridge. The microscope is fitted with a Lorentz lens for magnetic imaging, an electrostatic biprism and a Gatan Imaging Filter (GIF 2002) with a 2k x 2k CCD camera. Holograms were zeroloss filtered to remove inelastic scattering and recorded with the sample in field-free conditions using the Lorentz lens.