Wavenumbers
of current-induced excitations
PAPER: Z. Wei and
M. Tsoi,
“Probing wavenumbers
of current-induced excitations in point-contact experiments”,
Nanotechnology, Science and Applications 3, 17-21 (2010).
ABSTRACT:
We demonstrate how a mechanical
point-contact technique can provide information on the wavenumber
of spin waves excited by high-density electrical current in magnetic multilayers. By varying the size of point-contacts, we have
been able to control the size of the excitation volume and therefore the
wavelength of current-induced spin waves. This leads to a technique with in situ sensitivity to wavenumbers of current-induced excitations. Our detailed
size-dependent measurements support the prediction that the excited wavelength
is determined by the contact size.
The work was supported
in part by NSF Grant No. DMR-06-45377.