Demagnetizing Effects on Antiferromagnetic Resonance in CsNiF<SUB>3</SUB>

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  • Demagnetizing Effects on Antiferromagnetic Resonance in CsNiF3
  • Demagnetizing Effects on Antiferromagne

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Abstract

Antiferromagnetic resonance in CsNiF3 has been investigated at 35, 24 and 9 GHz bands between T=1.3 K and the Néel temperature (TN=2.61 K). The resonance frequencies are seriously dependent on sample shape. The results can be understood by a molecular field theory including both the surface demagnetization and the Lorentz fields. The critical field of the phase transition from the spin-flop to the paramagnetic phase has been obtained. The data at T=1.4 K allow a determination of the parameters: antiferromagnetic interchain exchange field HE=990±50 Oe, in-plane anisotropy field HA1=210±20 Oe and sublattice magnetization M=96±5 emu/cm3. The in-plane anisotropy due to the dipolar interaction is estimated to be 245 Oe in reasonable agreement with the observation. From the zero-field gap frequency a large negative anisotropy along the c-axis is dtermined to be HA2=60±3 kOe or D⁄k=9.2±0.5 K.

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