Zobrazeno 1 - 10
of 44
pro vyhledávání: '"Emley, N"'
We describe time-domain measurements which provide new information about the large-angle nonlinear dynamics of nanomagnets excited by spin-transfer torque from a spin-polarized current. Sampling-oscilloscope measurements, which average over thousands
Externí odkaz:
http://arxiv.org/abs/0709.0560
Autor:
Krivorotov, I. N., Berkov, D. V., Gorn, N. L., Emley, N. C., Sankey, J. C., Ralph, D. C., Buhrman, R. A.
We present spectral measurements of spin-wave excitations driven by direct spinpolarized current in the free layer of nanoscale Ir20Mn80/Ni80Fe20/Cu/Ni80Fe20 spin valves. The measurements reveal that large-amplitude coherent spin wave modes are excit
Externí odkaz:
http://arxiv.org/abs/cond-mat/0703458
Autor:
Emley, N. C., Krivorotov, I. N., Garcia, A. G. F., Ozatay, O., Sankey, J. C., Ralph, D. C., Buhrman, R. A.
We report time-resolved measurements of current-induced reversal of a free magnetic layer in Py/Cu/Py elliptical nanopillars at temperatures T = 4.2 K to 160 K. Comparison of the data to Landau-Lifshitz-Gilbert macrospin simulations of the free layer
Externí odkaz:
http://arxiv.org/abs/cond-mat/0510798
Autor:
Sankey, J. C., Krivorotov, I. N., Kiselev, S. I., Braganca, P. M., Emley, N. C., Buhrman, R. A., Ralph, D. C.
Publikováno v:
Phys. Rev. B 72, 224427 (2005)
The spin-transfer torque from a DC spin-polarized current can generate highly-coherent magnetic precession in nanoscale magnetic-multilayer devices. By measuring linewidths of spectra from the resulting resistance oscillations, we argue that the cohe
Externí odkaz:
http://arxiv.org/abs/cond-mat/0505733
Autor:
Kiselev, S. I., Sankey, J. C., Krivorotov, I. N., Emley, N. C., Garcia, A. G. F., Buhrman, R. A., Ralph, D. C.
Using measurements of the spectra of microwave-frequency resistance oscillations, we determine the phase diagram of magnetic excitations caused by torques from DC spin-polarized currents in (thin permalloy)/copper/(thick permalloy) multilayer samples
Externí odkaz:
http://arxiv.org/abs/cond-mat/0504402
Autor:
Fuchs, G. D., Krivorotov, I. N., Braganca, P. M., Emley, N. C., Garcia, A. G. F., Ralph, D. C., Buhrman, R. A.
We have fabricated nanoscale magnetic tunnel junctions (MTJs) with an additional fixed magnetic layer added above the magnetic free layer of a standard MTJ structure. This acts as a second source of spin-polarized electrons that, depending on the rel
Externí odkaz:
http://arxiv.org/abs/cond-mat/0503376
Autor:
Krivorotov, I. N., Emley, N. C., Garcia, A. G. F., Sankey, J. C., Kiselev, S. I., Ralph, D. C., Buhrman, R. A.
We measure the temperature, magnetic-field, and current dependence for the switching of nanomagnets by a spin-polarized current. Depending on current bias, switching can occur between either two static magnetic states or a static state and a current-
Externí odkaz:
http://arxiv.org/abs/cond-mat/0404003
Autor:
Fuchs, G. D., Emley, N. C., Krivorotov, I. N., Braganca, P. M., Ryan, E. M., Kiselev, S. I., Sankey, J. C., Katine, J. A., Ralph, D. C., Buhrman, R. A.
We report measurements of magnetic switching and steady-state magnetic precession driven by spin-polarized currents in nanoscale magnetic tunnel junctions with low-resistance, < 5 Ohm-micron-squared, barriers. The current densities required for magne
Externí odkaz:
http://arxiv.org/abs/cond-mat/0404002
Autor:
Kiselev, S. I., Sankey, J. C., Krivorotov, I. N., Emley, N. C., Rinkoski, M., Perez, C., Buhrman, R. A., Ralph, D. C.
We present electrical measurements of high-frequency magnetic dynamics excited by spin-polarized currents in Co/Cu/Ni80Fe20 nanopillar devices, with a magnetic field applied perpendicular to the sample layers. As a function of current and magnetic fi
Externí odkaz:
http://arxiv.org/abs/cond-mat/0403100
Autor:
Emley, N. C., Albert, F. J., Ryan, E. M., Krivorotov, I. N., Ralph, D. C., Buhrman, R. A., Daughton, J. M., Jander, A.
Synthetic antiferromagnetic layers (SAF) are incorporated into spin transfer nanopillars giving a layer composition [Co(bottom)/Ru/Co(fixed)]/Cu/Co(free), where square brackets indicate the SAF. The Co(bottom) and Co(fixed) layers are aligned antipar
Externí odkaz:
http://arxiv.org/abs/cond-mat/0401483