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.

5 pages, 4 figures

References in corpus (7)

• Low Temperature Spin Freezing in Dy2Ti2O7 Spin Ice
• Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2
• Magnetic Monopole Dynamics in Spin Ice
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• Macroscopic signature of protected spins in a dense frustrated magnet
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