Time-Domain Measurements of Nanomagnet Dynamics Driven by Spin-Transfer Torques

We present time-resolved measurements of gigahertz-scale magnetic dynamics caused by torque from a spin-polarized current. By working in the time domain, we determined the motion of the magnetic moment throughout the process of spin-transfer-driven switching, and we measured turn-on times of steady-...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2005-01, Vol.307 (5707), p.228-231
Main Authors: Krivorotov, I. N, Emley, N. C, Sankey, J. C, Kiselev, S. I, Ralph, D. C, Buhrman, R. A
Format: Article
Language:English
Subjects:
Atoms
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Damping
Electric current
Electric currents
Electric potential
Electron spin
Exact sciences and technology
Ferromagnetic materials
Generation of magnetic fields
magnets
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Magnetic components, instruments and techniques
Magnetic dipole moment
Magnetic fields
Magnetic properties
Magnetic properties and materials
Magnets
Measurement
Molecular magnets
Motion detectors
Nanotechnology
Physics
Precession
Sampling
Signals
Studies of specific magnetic materials
Torque
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Summary:We present time-resolved measurements of gigahertz-scale magnetic dynamics caused by torque from a spin-polarized current. By working in the time domain, we determined the motion of the magnetic moment throughout the process of spin-transfer-driven switching, and we measured turn-on times of steady-state precessional modes. Time-resolved studies of magnetic relaxation allow for the direct measurement of magnetic damping in a nanomagnet and prove that this damping can be controlled electrically using spin-polarized currents.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1105722