Magnetic Resonance in Metals in the Far Infrared

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Abstract
To measure the surface impedance of metals from 2 to 0.2 mm wavelength, we have utilized a lamellar interferometer and a bolometer detector which operates at 0.4°K. A simple transmission‐line sample geometry is used to make the metal samples compatible with our Fourier‐transform spectroscopic technique. The applicability of this method to magnetic resonance studies has been demonstrated by the observation of ferromagnetic resonance in nickel in large magnetic fields. An investigation of ferromagnetic Dy and Tb metals has proved somewhat more interesting because in both metals the magnetoelastic interaction energy is extremely large. From the temperature dependence of the ferromagnetic resonance in zero field we have found that the lattice does not follow the precessing magnetization during resonance.

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