Abstract
A domain wall is created halfway the thickness of a permalloy film (dimensions ℓ × b × d = 120 × 30 mm 2 × 9 μ m ) by passing a 16 A current in the direction of the width b through the film. The equilibrium position of this wall is varied by an in-plane magnetic field and determined from 3D polarisation analysis after transmitting a polarised neutron beam ( λ = 0.2 nm ) through the film (at 8 ∘ to the beam). Over a small field interval the net precession of the polarisation vector ranges from - π to + π with little depolarisation, implying that the domain wall moves from 1 4 to 3 4 of the thickness. If the wall approaches closer to either surface, the beam is fully depolarised. These observations apply also to AC fields up to 1 kHz. This suggests that the film can be used as wavelength adaptable flipper.
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