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Phys Rev Lett. 2007 May 11;98(19):197401. Epub 2007 May 10.

Negative refraction observed in a metallic ferromagnet in the gigahertz frequency range.

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  • 1Experimentelle Physik IV, Universität Würzburg, 97074 Würzburg, Germany.


It is generally believed that nature does not provide materials with negative refraction. Here we demonstrate experimentally that such materials do exist at least at GHz frequencies: ferromagnetic metals reveal a negative refraction index close to the frequency of the ferromagnetic resonance. The experimental realization utilizes a colossal magnetoresistance manganite La(2/3)Ca(1/3)MnO(3) as an example. In this material the negative refractive index can be achieved even at room temperature using external magnetic fields.

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