title: Domain-wall spin dynamics in kagome antiferromagnets.
abstract: We report magnetization and neutron scattering measurements down to 60 mK on a new family of Fe based kagome antiferromagnets, in which a strong local spin anisotropy combined with a low exchange path network connectivity lead to domain walls intersecting the kagome planes through strings of free spins. These produce unfamiliar slow spin dynamics in the ordered phase, evolving from exchange-released spin flips towards a cooperative behavior on decreasing the temperature, probably due to the onset of long-range dipolar interaction. A domain structure of independent magnetic grains is obtained that could be generic to other frustrated magnets.
authors.affiliation: Institut Néel, CNRS & Université Joseph Fourier, BP 166, 38042 Grenoble Cedex 9, France. elsa.lhotel@grenoble.cnrs.fr
authors.forename: E
authors.initials: E
authors.lastname: Lhotel
authors.forename: V
authors.initials: V
authors.lastname: Simonet
authors.forename: J
authors.initials: J
authors.lastname: Ortloff
authors.forename: B
authors.initials: B
authors.lastname: Canals
authors.forename: C
authors.initials: C
authors.lastname: Paulsen
authors.forename: E
authors.initials: E
authors.lastname: Suard
authors.forename: T
authors.initials: T
authors.lastname: Hansen
authors.forename: D J
authors.initials: DJ
authors.lastname: Price
authors.forename: P T
authors.initials: PT
authors.lastname: Wood
authors.forename: A K
authors.initials: AK
authors.lastname: Powell
authors.forename: R
authors.initials: R
authors.lastname: Ballou