Spectroscopy of phonons and spin torques in magnetic point contacts
arXiv:cond-mat/0509396 · doi:10.1103/PhysRevLett.95.186602
Abstract
Phonon spectroscopy is used to investigate the mechanism of current-induced spin torques in nonmagnetic/ferromagnetic (N/F) point contacts. Magnetization excitations observed in the magneto-conductance of the point contacts are pronounced for diffusive and thermal contacts, where the electrons experience significant scattering in the contact region. We find no magnetic excitations in highly ballistic contacts. Our results show that impurity scattering at the N/F interface is the origin of the new single-interface spin torque effect.
4 pages, 5 figs., accepted for publication in PRL
References in corpus (6)
- Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
- Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars
- Current-induced spin-wave excitations in a single ferromagnetic layer
- Theory of Current-Induced Magnetization Precession
- Current-induced transverse spin wave instability in a thin nanomagnet
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- Joule Heating and Current-Induced Instabilities in Magnetic Nanocontacts
- Current Driven tri-stable Resistance States in Magnetic Point Contacts
- Current-induced magnetic superstructures in exchange-spring devices
- Dynamics of Current Induced Magnetic Superstructures in Exchange-Spring Devices
- Magnetic unipolar features in con- ductivity of point contacts between normal and ferromagnetic d-metals (Co, Ni, Fe)
- Spin-valve effects in point contacts to exchange biased Co40Fe40B20 films