Abstract
Magnetic flux distribution in ferrofluids has been evaluated by a new method based on Larmor precession of neutron spin and Fourier analysis of precession phases over the neutron wavelength spectrum. Using this method for a thin layer of magnetic fluid in an in-plane magnetic field, we detected an inhomogeneous distribution of induction. It is stronger near the non-magnetic fluid–metal interface. The surface layer covering ∼60% of the volume at low field H 1=10 Oe is shrunken to ∼25% at a stronger field H 2=200 Oe when the fluid is substantially magnetised. Microscopic mechanisms of surface-induced ordering are discussed.
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