Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-07-17
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1103/PhysRevB.84.092403
When electron spins are injected uniformly into a paramagnetic disc, they can precess along the demagnetizing field induced by the resulting magnetic moment. Normally this precession damps out by virtue of the spin relaxation which is present in paramagnetic materials. We propose a new mechanism to excite a steady-state form of this dynamics by injecting a constant spin current into this paramagnetic disc. We show that the rotating magnetic field generated by the eddy currents provide a torque which makes this possible. Unlike the ferromagnetic equivalent, the spin-torque-oscillator, the oscillation frequency is fixed and determined by the dimensions and intrinsic parameters of the paramagnet. The system possesses an intrinsic threshold for spin injection which needs to be overcome before steady-state precession is possible. The additional application of a magnetic field lowers this threshold. We discuss the feasibility of this effect in modern materials. Transient analysis using pump-probe techniques should give insight in the physical processes which accompany this effect.
Slachter Abraham
van Wees Bart Jan
No associations
LandOfFree
Spin current induced magnetization oscillations in a paramagnetic disc 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 Spin current induced magnetization oscillations in a paramagnetic disc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin current induced magnetization oscillations in a paramagnetic disc will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-479016