Negative refraction observed in a metallic ferromagnet in the gigahertz frequency range |
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Authors: | Pimenov A Loidl A Gehrke K Moshnyaga V Samwer K |
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Institution: | Experimentelle Physik IV, Universit?t Würzburg, 97074 Würzburg, Germany. |
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Abstract: | 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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