Quantitative study of magnetic field distribution by electron holography and micromagnetic simulations

Beleggia, M.; Schofield, M. A.; Zhu, Y.; Malac, M.; Liu, Z.; Freeman, M.
August 2003
Applied Physics Letters;8/18/2003, Vol. 83 Issue 7, p1435
Academic Journal
The magnetic configuration of a submicrometer Ni[sub 88]Fe[sub 12] permalloy island has been quantitatively mapped by off-axis electron holography. The two main contributions to the electron-optical phase shift, namely the phase shifts induced by the electrostatic and magnetic potentials, including fringing fields, were separated by inverting the specimen of 180° with respect to the electron beam and directly measuring the mean inner potential. A quantitative map of the projected magnetic induction in the sample was thereby retrieved and compared to results of micromagnetic and electromagnetic calculations, providing the minimum-energy configuration and the phase shift, respectively. © 2003 American Institute of Physics.


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