Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2000-12-18
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages, 3 figures. To appear in J. Appl. Phys., vol. 89, May 15, 2001
Scientific paper
10.1063/1.1365080
In metallic ferromagnets, an electric current is accompanied by a flux of angula r momentum, also called spin current. In multilayers, spatial variations of the spin current correspond to drive torques exerted on a magnetic layer. These torq ues result in spin precession above a certain current threshold. The usual kind of spin current is associated with translation of the spin-up and spin-down Ferm i surfaces in momentum space. We discuss a different kind of spin current, assoc iated with expansion and contraction of the Fermi surfaces. It is more nonlocal in nature, and may exist even in locations where the electrical current density is zero. It is larger than the usual spin current, in a ratio of 10 or 100, and is dominant in most cases. The new spin current is proportional to the differenc e Delta-mu = 0.001 eV between spin-up and spin-down Fermi levels, averaged over the entire Fermi surface. Conduction processes, spin relaxation, and spin-wave emission in the multilayer can be described by an equivalent electrical circuit resembling an unbalanced dc Wheatstone bridge. And Delta-mu corresponds to the output voltage of the bridge.
No associations
LandOfFree
New Origin For Spin Current And Current-Induced Spin Precession In Magnetic Multilayers does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with New Origin For Spin Current And Current-Induced Spin Precession In Magnetic Multilayers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and New Origin For Spin Current And Current-Induced Spin Precession In Magnetic Multilayers will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-255949