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Antiferromagnetic resonance in ferroborate NdFe3(BO 3)4

机译:铁硼酸钕铁硼(BO 3)4中的反铁磁共振

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摘要

The AFMR spectra of the NdFe3(BO3)4 crystal are measured in a wide range of frequencies and temperatures. It is found that by the type of its 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 Ha1=1.14 kOe and Ha2=60 kOe and magnetic excitation gaps Δν1= 101.9 GHz and Δν2=23.8 GHz. It is shown that commensurateincommensurate 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.
机译:NdFe3(BO3)4晶体的AFMR光谱是在很宽的频率和温度范围内测量的。已经发现,根据其磁各向异性的类型,该化合物是在基面上具有弱各向异性的易平面反铁磁体。确定有效的磁参数:各向异性场Ha1 = 1.14 kOe和Ha2 = 60 kOe以及磁激励间隙Δν1= 101.9 GHz和Δν2= 23.8 GHz。结果表明,相称相称引起相变场和吸收线宽度的显着变化。在低于4.2 K的温度下,在低微波功率水平下观察到AFMR激发的非线性机制。

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