Article,
Excitation of spin waves by an electric current
Journal of Magnetism and Magnetic Materials, 195 (2): 261--268 (May 1999)
Abstract
The excitation of spin waves in an unbounded ferromagnetic film by
a direct spin-polarized current distributed over a small area is
treated macroscopically. The derived critical threshold current for
excitation has two additive terms: The first arises from radiation
of spin waves and is constant. The second arises from local viscous
dissipation and varies in proportion to damping coefficient, external
field, and area. An application of these predictions modifies the
existing interpretation of experiments by Tsoi and collaborators
employing currents flowing through point contacts.
