We report ferromagnetic resonance in the normal configuration of an electrically insulating magnetic bi-layer consisting of two yttrium iron garnet (YIG) films epitaxially grown on both sides of a 0.5 mm thick non-magnetic gadolinium gallium garnet (GGG) slab. An interference pattern is observed and it is explained as the strong coupling of the magnetization dynamics of the two YIG layers either in-phase or out-of-phase by the standing transverse sound waves, which are excited through the magneto-elastic interaction. This coherent mediation of angular momentum by circularly polarized phonons through a non-magnetic material over macroscopic distances can be useful for future information technologies. arXiv:1905.12523v3 [cond-mat.mes-hall]
The advantage of an ultra-fast frequency-tunability of spin-torque nano-oscillators (STNOs) that have large (> 100MHz) relaxation frequency of amplitude fluctuations is exploited to realize ultra-fast wide-band time-resolved spectral analysis at nanosecond time scale with the frequency resolution limited only by the "bandwidth" theorem. The demonstration is performed with an STNO generating in the 9 GHz frequency range, and comprised of a perpendicular polarizer and a perpendicularly and uniformly magnetized "free" layer. It is shown that such a uniform-state STNO-based spectrum analyzer can efficiently perform spectral analysis of frequency-agile signals with rapidly varying frequency components.
The
advantage of an ultrafast frequency-tunability of spin-torque
nano-oscillators (STNOs) that have a large (>100 MHz) relaxation
frequency
of amplitude fluctuations is exploited to realize ultrafast wide-band
time-resolved spectral analysis at nanosecond time scale with a frequency
resolution limited only by the “bandwidth” theorem.
The demonstration is performed with an STNO generating in the 9 GHz
frequency range and comprised of a perpendicular polarizer and a perpendicularly
and uniformly magnetized “free” layer. It is shown that
such a uniform-state STNO-based spectrum analyzer can efficiently
perform spectral analysis of frequency-agile signals with rapidly
varying frequency components.
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