One-magnon inelastic light scattering in the canted antiferromagnet ${\text{NiF}}_{2}$

One-magnon inelastic light scattering in the canted antiferromagnet ${NiF}_{2}$

E. Meloche, M. G. Cottam, V. P. Gnezdilov, and D. J. Lockwood

Phys. Rev. B 81, 024426 – Published 27 January 2010

Abstract

Experimental results concerning the temperature and polarization dependence of the one-magnon Raman light scattering in the canted antiferromagnet ${NiF}_{2}$ (Néel temperature $T_{N} = 73 K$ ) are reported. The excitation frequencies, linewidths, and integrated intensities of the lower and upper magnon branches are obtained over the temperature range 5–65 K. A comparison between theory and experiment for the frequencies of the one-magnon branches shows good overall agreement for temperatures up to $0.3 T_{N}$ . A theoretical model that includes the effects of linear and quadratic magneto-optical coupling is used to account for the observed polarization characteristics of the Stokes and anti-Stokes peaks. The analysis takes account of the small canting angle of the spins which complicates the behavior of the lower magnon branch, in particular. The experimental data are indicative of a possible spin-reorientation transition at $\sim 31 K$ .

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Received 9 June 2009

DOI:https://doi.org/10.1103/PhysRevB.81.024426

Authors & Affiliations

E. Meloche^1,*, M. G. Cottam¹, V. P. Gnezdilov^2,†, and D. J. Lockwood²

¹Department of Physics and Astronomy, University of Western Ontario, London, Ontario, Canada N6A 3K7
²Institute for Microstructural Sciences, National Research Council, Ottawa, Ontario, Canada K1A 0R6

^*Present address: 7801 Computer Ave., Bloomington, MN 55435; eric.meloche@seagate.com
^†Present address: B. I. Verkin Institute for Low Temperature Physics, National Academy of Sciences of Ukraine, 61103 Kharkov, Ukraine.

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Vol. 81, Iss. 2 — 1 January 2010

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Physical Review B

covering condensed matter and materials physics

One-magnon inelastic light scattering in the canted antiferromagnet ${NiF}_{2}$

E. Meloche, M. G. Cottam, V. P. Gnezdilov, and D. J. Lockwood

Phys. Rev. B 81, 024426 – Published 27 January 2010

Abstract

Authors & Affiliations

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Physical Review B

covering condensed matter and materials physics

One-magnon inelastic light scattering in the canted antiferromagnet NiF2

E. Meloche, M. G. Cottam, V. P. Gnezdilov, and D. J. Lockwood

Phys. Rev. B 81, 024426 – Published 27 January 2010

Abstract

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One-magnon inelastic light scattering in the canted antiferromagnet ${NiF}_{2}$