Y Luo

Publications (2)2.17 Total impact

• Article: Negative refraction in natural ferromagnetic metals

  S. Engelbrecht, A. M. Shuvaev, Y. Luo, V. Moshnyaga, A. Pimenov
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  ABSTRACT: It is generally believed that Veselago's criterion for negative refraction cannot be fulfilled in natural materials. However, considering imaginary parts of the permittivity (ε) and permeability (μ) and for metals at not too high frequencies the general condition for negative refraction becomes extremely simple: Re(μ)<0Re(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.
  EPL (Europhysics Letters) 07/2011; 95(3):37005. · 2.17 Impact Factor
• Source

  Available from: ArXiv

  Article: Negative refraction in natural ferromagnetic metals

  Sebastian Engelbrecht, Alexey Mikhailovich Shuvaev, Y Luo, V. Moshnyaga, Andrei Pimenov
  [show abstract] [hide abstract]
  ABSTRACT: 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 --> Re(n) < 0. Here we demonstrate experimentally that in such natural metals as pure Co and FeCo alloy the negative values of the refractive index are 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.
  11/2010;