Boone, C. T., Katine, J. A., Carey, M., Childress, J. R., Cheng, X., Krivorotov, I. N.
Recent experiments show that domain walls (DW) in metallic ferromagnetic nanowires can be moved with current flowing along the nanowire. We make measurements of DW dynamics in permalloy nanowires...
Single-shot time-domain studies of spin-torque-driven switching in magnetic tunnel junctions (2009)
Finocchio, G., Wang, C., Katine, J. A., Buhrman, R. A., Ralph, D. C.
We report single-shot measurements of resistance versus time for thermally assisted spin-torque-driven switching in magnetic tunnel junctions. We achieve sufficient sensitivity to resolve the...
Sensitivity of spin-torque diodes for frequency-tunable resonant microwave detection (2009)
Wang, C., Sun, J. Z., Katine, J. A., Buhrman, R. A., Ralph, D. C.
We calculate the efficiency with which magnetic tunnel junctions can be used as resonant detectors of incident microwave radiation via the spin-torque diode effect. The expression we derive is in...
Distortion of the Stoner-Wohlfarth astroid by a spin-polarized current (2009)
Henry, Y., Mangin, S., Cucchiara, J., Katine, J. A., Fullerton, E. E.
The Stoner-Wohlfarth astroid is a fundamental object in magnetism. It separates regions of the magnetic field space with two stable magnetization equilibria from those with only one stable...
Experimental Test of Analytic Theory of Spin Torque Oscillator Dynamics (2008)
Boone, C., Katine, J. A., Childress, J. R., Zhu, J., Cheng, X., Krivorotov, I. N.
We make measurements of power spectral density of the microwave voltage emitted by a spin torque nano-oscillator (STNO) and compare our experimental results to predictions of an analytic theory of a...
Scaling Properties of Critical Phase Change Conditions in Ge2Sb2Te5 Nanopillars (2008)
Ozatay, O., Stipe, B., Katine, J. A., Terris, B. D.
We have measured the critical phase change conditions induced by electrical pulses in Ge2Sb2Te5 nanopillar phase change memory devices by constructing a comprehensive resistance map as a function of...
Effects of rf Current on Spin Transfer Torque Induced Dynamics (2008)
Florez, S. H., Katine, J. A., Carey, M., Folks, L., Ozatay, O., Terris, B. D.
The impact of radiofrequency (rf) currents on the direct current (dc) driven switching dynamics in current-perpendicular-to-plane nanoscale spin valves is demonstrated. The rf currents dramatically...
Keatley, P. S., Kruglyak, V. V., Neudert, A., Galaktionov, E. A., Hicken, R. J., Childress, J. R., ...
We have performed time-resolved scanning Kerr microscopy (TRSKM) measurements upon arrays of square ferromagnetic nano-elements of different size and for a range of bias fields. The experimental...
Distribution of the magnetization reversal duration in sub-ns spin-transfer switching (2006)
Devolder, T., Chappert, C., Katine, J. A., Carey, M. J., Ito, K.
We study the distribution of switching times in spin-transfer switching induced by sub-ns current pulses in pillar-shaped spin-valves. The pulse durations leading to switching follow a comb-like...
Mistral, Q., Kim, Joo-Von, Devolder, T., Crozat, P., Chappert, C., Katine, J. A., ...
We study the current and temperature dependences of the microwave voltage emission of spin-valve nanopillars subjected to an in-plane magnetic field and a perpendicular-to-plane current. Despite the...
Time-resolved imaging of spin transfer switching: Beyond the macrospin concept (2006)
Acremann, Y, Strachan, J. P., Chembrolu, V, Andrews, S. D., Tyliszczak, T, Katine, J. A., ...
Time-resolved images of the magnetization switching process in a spin transfer structure, obtained by ultrafast x-ray microscopy, reveal the limitations of the macrospin model. Instead of a coherent...
Fuchs, G. D., Katine, J. A., Kiselev, S. I., Mauri, D., Wooley, K. S., Ralph, D. C., ...
We examine the spin torque (ST) response of magnetic tunnel junctions (MTJs) with ultra-thin MgO tunnel barrier layers to investigate the relationship between the spin-transfer torque and the tunnel...
Angular Dependence of Spin-Torque Critical Currents in CPP-GMR Read Heads (2005)
Smith, Neil, Katine, J. . A., Childress, Jeffrey R., Carey, Matthew J.
This paper derives expressions for the critical current at the onset of spin-transfer-torque (STT) instability in CPP-GMR read heads, as a function of the relative angle (theta) between the free and...
Lacour, D., Katine, J. A., Smith, N., Carey, M. J., Childress, J. R.
We have developed a self-aligned, high-yield process to fabricate CPP (current perpendicular to the plane) magnetic sensors of sub 100 nm dimensions. A pinned synthetic antiferromagnet (SAF) is used...
Spin-Transfer Effects in Nanoscale Magnetic Tunnel Junctions (2004)
Fuchs, G. D., Emley, N. C., Krivorotov, I. N., Braganca, P. M., Ryan, E. M., Kiselev, S. I., ...
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,...
Lacour, D., Katine, J. A., Folks, L., Block, T., Childress, J. R., Carey, M. J., ...
The presence of a domain wall trapped by a sub-micron notch is probed in two ways: through electronic transport measurements and by Magnetic Force Microscopy (MFM). We observe complex magnetic...
Current-driven Magnetization Reversal and Spin Wave Excitations in Co/Cu/Co Pillars (1999)
Katine, J. A., Albert, F. J., Buhrman, R. A., Myers, E. B., Ralph, D. C.
Using thin film pillars ~100 nm in diameter, containing two ferromagnetic Co layers of different thicknesses separated by a paramagnetic Cu spacer, we examine effects of torques due to spin-polarized...