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Observation of asymmetric Bloch walls in epitaxial Co films with strong in-plane uniaxial anisotropy

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: I. L. Prejbeanu, L. D. Buda, U. Ebels and K. Ounadjela

Editorial: Applied Physics Letters, 77, p.3066, 2000.


Combined studies involving magnetic force microscopy and
micromagnetic simulations are used to investigate the domain wall
structure in epitaxial Co(10-10) thin films with
strong in-plane uniaxial magneto-crystalline anisotropy. This
letter shows experimental evidence that, for such a system, the
domain wall structure transforms from an asymmetric Bloch wall
into an asymmetric Néel wall upon decreasing the film thickness
from 100 nm to 20 nm. This transition occurs without cross-tie
walls formation. Furthermore, it is found that from the four
possible energetically equivalent asymmetric Bloch wall
configurations, only two are stabilized along a single domain
wall. For a given wall, the transition from one configuration to
the other involves the simultaneous reversal of the polarity of
the Bloch core and the Néel cap.

Cuvinte cheie: domain walls, micromagnetics, magnetic force microscopy, epitaxial thin films