Negative refraction in natural ferromagnetic metals
Negative refraction in natural ferromagnetic metals
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DOI：
10.1209/0295-5075/95/37005
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发表时间：
2011-08-01
期刊：
影响因子：
1.8
通讯作者：
Pimenov, A.
中科院分区：
文献类型：
--
作者：
Engelbrecht, S.;Shuvaev, A. M.;Pimenov, A.
人们普遍认为，Veselago的负折射判据在天然材料中是不可能实现的。然而，考虑到介电常数（ε）和磁导率（μ）的虚部，对于频率不太高的金属，负折射的一般条件变得非常简单：Re（μ）< 0双右箭头Re（n）< 0，并且可以满足镍，铁或钴等天然铁磁金属。在这里，我们证明实验，在纯钴和Fe/Co合金的折射率的负值确实可以实现接近铁磁共振的频率。在室温下可以获得大的负折射值，并且它们可以在中等磁场中容易地调谐。版权所有（C）EPLA，2011
It is generally believed that Veselago's criterion for negative refraction cannot be fulfilled in natural materials. However, considering imaginary parts of the permittivity (epsilon) and permeability (mu) and for metals at not too high frequencies the general condition for negative refraction becomes extremely simple: Re(mu) < 0 double right arrow Re(n) < 0 and may be fulfilled for such natural ferromagnetic metals as nickel, iron, or cobalt. Here we demonstrate experimentally that in pure cobalt and Fe/Co alloy the negative values of the refractive index can indeed be achieved close to the frequency of the ferromagnetic resonance. Large values of the negative refraction can be obtained at room temperature and they can easily be tuned in moderate magnetic fields. Copyright (C) EPLA, 2011