Quantitative determination of magnetic fields from iron particles of oblong form encapsulated by carbon nanotubes using electron holography
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- Nepijko, S.A., Graff, A., Schönhense, G. et al. Appl. Phys. A (2009) 94: 543. doi:10.1007/s00339-008-4947-7
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Using electron holography (interference electron microscopy) we have made measurements of the magnetic flux and magnetic field distribution around a carbon nanotube filled with iron. At the surface of the carbon nanotube, an iron particle with a radius of 30 nm and a length of 200 nm created a magnetic flux of 10−15 Wb (Weber) and a magnetic field of 0.3–0.4 T (Tesla). The theory developed in this work is constrained to the case of cylindrical symmetry of the investigated ferromagnetic particles, but, in general, such studies can be made for ferromagnetic particles of any shape.