铁硼酸盐NdFe $_3$（BO $_3$）中的反铁磁共振$_4
Antiferromagnetic resonance in ferroborate NdFe$_3$(BO$_3$)$_4
摘要：
测量了NdFe $_3$（BO $_3$）$_4$晶体在较宽频率和温度范围内的AFMR谱。根据磁各向异性的类型，发现该化合物是一种在基面具有弱各向异性的易面反铁磁体。确定了有效磁参数：各向异性场$H_{a1}$ =1.14 kOe和$H_{a2}$ =60 kOe，磁激发隙$Δν_1$ =101.9 GHz和$Δν_2$ =23.8 GHz。结果表明，超导体的无公度相变引起共振场的移动和吸收线宽的显著变化。在低于4.2 K的温度下，在低微波功率水平的AFMR激发的非线性制度进行了观察。
英文摘要：
The AFMR spectra of the NdFe$_3$(BO$_3$)$_4$ crystal are measured in a wide range of frequencies and temperatures. It is found that by the type of magnetic anisotropy the compound is an "easy-plane" antiferromagnet with a weak anisotropy in the basal plane. The effective magnetic parameters are determined: anisotropy fields $H_{a1}$=1.14 kOe and $H_{a2}$=60 kOe and magnetic excitation gaps $Δν_1$=101.9 GHz and $Δν_2$=23.8 GHz. It is shown that commensurate-incommensurate phase transition causes a shift in resonance field and a considerable change in absorption line width. At temperatures below 4.2 K nonlinear regimes of AFMR excitation at low microwave power levels are observed.
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