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Complementary terahertz absorption and inelastic neutron study of the dynamic anisotropy contribution to zone-center spin waves in a canted antiferromagnet NdFeO3

Journal Article


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Abstract


  • We employ a combination of pulsed- and continuous-wave polarized terahertz spectroscopy techniques to probe temperature-dependent spin waves in the antiferromagnet NdFeO3. Our optical data span 1.6–467 K and reveal a conspicuous spin reorientation between 110 and 170 K, during which the lower-energy mode softens completely. Complementary inelastic neutron scattering reveals that the frequencies of the optically excited spin waves are consistent with a temperature-variable spin gap in the low-energy spin-wave dispersion of NdFeO3. The result links the temperature dependence of the spin waves to a dynamic in-plane anisotropy. The magnetic anisotropy is calculated based on the results of the optical measurements. The change observed in the anisotropy energy along the a and c crystal axes suggests that the spin reorientation evident in NdFeO3 is driven by temperature-dependent in-plane anisotropy.

Publication Date


  • 2014

Citation


  • Constable, E., Cortie, D. L., Horvat, J., Lewis, R. A., Cheng, Z., Deng, G., Cao, S., Yuan, S. & Ma, G. (2014). Complementary terahertz absorption and inelastic neutron study of the dynamic anisotropy contribution to zone-center spin waves in a canted antiferromagnet NdFeO3. Physical Review B: Condensed Matter and Materials Physics, 90 (5), 054413-1-054413-9.

Scopus Eid


  • 2-s2.0-84940363623

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2246&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1245

Start Page


  • 054413-1

End Page


  • 054413-9

Volume


  • 90

Issue


  • 5

Place Of Publication


  • http://journals.aps.org/prb/abstract/10.1103/PhysRevB.90.054413

Abstract


  • We employ a combination of pulsed- and continuous-wave polarized terahertz spectroscopy techniques to probe temperature-dependent spin waves in the antiferromagnet NdFeO3. Our optical data span 1.6–467 K and reveal a conspicuous spin reorientation between 110 and 170 K, during which the lower-energy mode softens completely. Complementary inelastic neutron scattering reveals that the frequencies of the optically excited spin waves are consistent with a temperature-variable spin gap in the low-energy spin-wave dispersion of NdFeO3. The result links the temperature dependence of the spin waves to a dynamic in-plane anisotropy. The magnetic anisotropy is calculated based on the results of the optical measurements. The change observed in the anisotropy energy along the a and c crystal axes suggests that the spin reorientation evident in NdFeO3 is driven by temperature-dependent in-plane anisotropy.

Publication Date


  • 2014

Citation


  • Constable, E., Cortie, D. L., Horvat, J., Lewis, R. A., Cheng, Z., Deng, G., Cao, S., Yuan, S. & Ma, G. (2014). Complementary terahertz absorption and inelastic neutron study of the dynamic anisotropy contribution to zone-center spin waves in a canted antiferromagnet NdFeO3. Physical Review B: Condensed Matter and Materials Physics, 90 (5), 054413-1-054413-9.

Scopus Eid


  • 2-s2.0-84940363623

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=2246&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/1245

Start Page


  • 054413-1

End Page


  • 054413-9

Volume


  • 90

Issue


  • 5

Place Of Publication


  • http://journals.aps.org/prb/abstract/10.1103/PhysRevB.90.054413