3:30 PM, Jan 28, 2011
Sumwalt, Room 102

A.V. Chumak
Technische Universitat Kaiserslautern, Germany
chumak@physik.uni-kl.de

Magnonic crystal devices

Artificial media with spatially periodic variations in their magnetic
properties -- so-called magnonic crystals (MCs) -- are the magnetic
analog of photonic and sonic crystals. Spin-wave excitation spectra of
such structures exhibit a range of interesting features including band
gaps over which spin wave propagation is prohibited. MC systems have
potential to provide the basis for a range of magnetic devices with
novel and highly technologically relevant functionality. I shall
discuss a selection of our recent work in this area including: (1) The
use of geometrically structured MCs as spin-wave notch filters; (2) the
development of a current-controlled dynamic MC which can be switched
"on" and "off" more than ten times faster the spin-wave relaxation time
and thus enables a new mechanism of all-linear time reversal of
propagating wave packets, and (3) the design and construction of a
spin-wave ring oscillator using a magnonic crystal as a wavelength
stabilizer.