很有可能是测试设备有问题。
另外请参考Zhang X F, Guan P F, Dong X L. Transform between the permeability and permittivity in the close-packed Ni nanoparticles [J]. Appl Phys Lett, 2010, 97
In left hand materials, the real part of the permittivity and permeability should be negative, not the imaginary part. The imaginary parts of the permittivity and permeability mean the loss of the materials, so they never should be negative.
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