Some applications of polarized inelastic neutron scattering in magnetism |
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Authors: | B Roessli P Böni |
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Institution: | 1.Laboratory for Neutron Scattering,ETH Zürich & Paul Scherrer Institute,Villigen,Switzerland;2.Physik-Department E21,Technische Universit?t München,Garching,Germany |
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Abstract: | A brief account of applications of polarized inelastic neutron scattering in condensed matter research is given. We show that
full polarization analysis is the only tool allowing to discriminate unambiguously between different magnetic modes in various
magnetic materials. We show by means of recent results in the Heisenberg ferromagnet EuS that the effects of dipolar interactions
can be studied on a microscopic scale. Moreover, we have found for the first time indications for the divergence of the longitudinal
fluctuations belowT
c. In the itinerant antiferromagnet chromium we demonstrate that the dynamics of the longitudinal and transverse excitations
are very different, resolving a long standing puzzle concerning the slope of their dispersion. Finally, we show that a measurement
of the polarization-dependent part of the cross section of non-centrosymmetric MnSi proves directly that the chirality of
the magnetic fluctuations is left-handed. |
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Keywords: | Polarized inelastic neutron scattering Spin waves Spin fluctuations Spin chirality |
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