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Posted: Feb 22, 2012
On-chip microwave interferometer measures single magnetic nanowire
(Nanowerk News) Ferromagnetic resonance (FMR) is the main technique for investigating the magnetization dynamics of patterned magnetic structures that are of interest for high-speed memory, magnetic storage, and signal-processing applications.
The sensitivity of conventional transmission-line-based FMR approaches are either inadequate for single nanoscale magnetic structures or else they introduce background common mode noise.
The device automatically cancels background parasitic common mode noise. The magnetization dynamics of a 240-nm-wide, 5-Ám-long, and 70-nm-thick single permalloy nanowire was investigated in particular.
Full wave three-dimensional simulations show that the device has the capability of studying the fundamental physics of nanoscale magnetic devices.