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Observation of an inverse Doppler shift from left-handed dipolar spin waves

Daniel D. Stancil, Benjamin E. Henty, Ahmet G. Cepni, and J. P. Van't Hof. Observation of an inverse Doppler shift from left-handed dipolar spin waves. Physical Review B (Condensed Matter and Materials Physics), 74(6):060404, Aug. 2006.

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Abstract

We report the experimental observation of an inverse Doppler shift from the motion of an ordinary solid object. The experiment used left-handed, or backward, spin waves in a magnetic thin film. As a pick-up antenna was moved toward the spin wave source, the measured frequency decreased. In contrast, an increase would be expected in everyday experience as the observer approaches the source. The backward spin wave wavelength in the experiment was 1.83 mm at 3 GHz, resulting in a Doppler shift of 546 Hz sec / m, or about 50 times larger than would be observed on an ordinary electromagnetic wave at the same frequency. The measured shifts and dispersion relation agree well with the established theory.

@ARTICLE{henty_prb_2006,
  author = {Daniel D. Stancil and Benjamin E. Henty and Ahmet G. Cepni and J.
	P. Van't Hof},
  title = {Observation of an inverse Doppler shift from left-handed dipolar
	spin waves},
  journal = {Physical Review B (Condensed Matter and Materials Physics)},
  year = {2006},
  volume = {74},
  pages = {060404},
  number = {6},
  month = {Aug.},
  eid = {060404},
  abstract = {We report the experimental observation of an inverse Doppler shift
	from the motion of an ordinary solid object. The experiment used
	left-handed, or backward, spin waves in a magnetic thin film. As
	a pick-up antenna was moved toward the spin wave source, the measured
	frequency decreased. In contrast, an increase would be expected in
	everyday experience as the observer approaches the source. The backward
	spin wave wavelength in the experiment was 1.83 mm at 3 GHz, resulting
	in a Doppler shift of 546 Hz sec / m, or about 50 times larger than
	would be observed on an ordinary electromagnetic wave at the same
	frequency. The measured shifts and dispersion relation agree well
	with the established theory.},
  doi = {10.1103/PhysRevB.74.060404},
  keywords = {Doppler shift; spin waves; magnetic thin films; electromagnetic waves},
  numpages = {4},
  owner = {henty},
  pdf = {henty_prb_2006.pdf},
  timestamp = {2006.10.24},
  url = {http://link.aps.org/abstract/PRB/v74/e060404},
}

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