Fast thermally assisted switching at low current density in (Ga,Mn)As magnetic tunnel junctions

Zhen Li; Lagae, Liesbet; Borghs, Gustaaf; Mertens, Robert; Van Roy, Willem
February 2010
Applied Physics Letters;2/1/2010, Vol. 96 Issue 5, p052513
Academic Journal
(Ga,Mn)As based magnetic tunnel junctions have potential advantages compared to metal based junctions. In magnetic memory applications, spin-torque switching is the main approach to write information. In addition to the spin-torque effect, the current through the junction also increases the temperature, which can change the coercive fields and switch the magnetization of the (Ga,Mn)As layers in suitable bias fields. Using pulsed currents, we control the temperature increase and switch the junction states with critical current density as low as 3×103 A/cm2 for 100 ns pulses, or with pulses as short as 300 ps at current densities of 5×104 A/cm2.


Related Articles

  • A new pulse compression circuit for low impedance pulse power generation. Masugata, Katsumi // Review of Scientific Instruments;Dec1995, Vol. 66 Issue 12, p5640 

    Proposes a novel type of pulse compression circuit for generating low impedance pulse power. Schematic diagram of the proposed pulse compression circuit; Features; Design considerations.

  • Spin-transfer-torque reversal in perpendicular anisotropy spin valves with composite free layers. Yulaev, I.; Lubarda, M. V.; Mangin, S.; Lomakin, V.; Fullerton, Eric E. // Applied Physics Letters;9/26/2011, Vol. 99 Issue 13, p132502 

    We describe modeling of spin-transfer-torque (STT) driven reversal in nanopillars with strong out-of-plane magnetic anisotropy where the free layer is a magnetically hard-soft composite structure. By adjusting the exchange coupling between the hard and soft layers, we observed reduced current...

  • Motion of a magnetic domain wall traversed by fast-rising current pulses. Berger, L. // Journal of Applied Physics;3/15/1992, Vol. 71 Issue 6, p2721 

    Presents a study that examined the motion of magnetic domain wall traversed by fast-rising current pulses. Equations of motion for a domain wall; Procedures for the wall-streaming experiments; Pulse of electric current or hard axis field with very short rise time.

  • Correlation between electroluminescence efficiency and stability in organic light-emitting devices under pulsed driving conditions. Yichun Luo; Aziz, Hany; Popovic, Zoran D.; Gu Xu // Journal of Applied Physics;3/1/2006, Vol. 99 Issue 5, p054508 

    We investigated the effect of using pulsed current (pc) versus direct current (dc) driving mode on the electroluminescence (EL) efficiency and operational stability of tris(8-hydroxy-quinoline)aluminum (AlQ3)-based organic light-emitting devices. The results show that the dependence of device...

  • Rotating-Mirror Q-Switched Er: YAG Laser for Optodynamic Studies. Bizjak, Aleš; Nemeš, Karolj; Možina, Janez // Strojniski Vestnik / Journal of Mechanical Engineering;Jan2011, Vol. 57 Issue 1, p3 

    In this article a development of a simple, reliable and repeatable Q-switched Er:YAG laser with a pulse duration of 270 ns and energies up to 16 mJ in a TEM00 spatial beam mode is presented. The Q-switching is performed mechanically with a flat, highly reflective silicon rotating mirror. The...

  • Magnetic memory and current amplification devices using moving domain walls. Barnes, S. E.; Ieda, J.; Maekawa, S. // Applied Physics Letters;9/18/2006, Vol. 89 Issue 12, p122507 

    A moving magnetic domain wall produces an electromotive force (emf). It is therefore possible to read the state of a magnetic memory device via the emf it produces when subjected to an interrogation pulse. It is also possible to amplify currents in pulse circuits, opening up the possibility of...

  • Guided Radar System for Arc Detection: Initial Results at DIIID. Salvador, S. M.; Maggior, R.; Goulding, R. H.; Moore, J. A.; Pinsker, R. I.; Nagy, A. // AIP Conference Proceedings;2014, Vol. 1580, p283 

    A guided radar arc detection and localization system has been designed, fabricated, installed in the feed line to one of the resonant loops on the 285/300 FW antenna, and successfully tested during vacuum conditioning. The system injects a train of binary phase-modulated pulses at a carrier...

  • Reducing the critical current for short-pulse spin-transfer switching of nanomagnets. Braganca, P. M.; Krivorotov, I. N.; Ozatay, O.; Garcia, A. G. F.; Emley, N. C.; Sankey, J. C.; Ralph, D. C.; Buhrman, R. A. // Applied Physics Letters;9/12/2005, Vol. 87 Issue 11, p112507 

    We have fabricated permalloy/copper/permalloy nanopillar spin valves designed to reduce the critical current for spin-transfer switching while maintaining thermal stability of the free layer. Pulsed current amplitudes necessary for switching a 4.5-nm-thick permalloy free layer range from 0.4 mA...

  • Latest Results from the Front End Test Stand High Performance H- Ion Source at RAL. Faircloth, D. C.; Lawrie, S. R.; Letchford, A. P.; Gabor, C.; Whitehead, M.; Wood, T.; Perkins, M. // AIP Conference Proceedings;9/26/2011, Vol. 1390 Issue 1, p205 

    The aim of the Front End Test Stand (FETS) project is to demonstrate that chopped low energy beams of high quality can be produced. FETS consists of a high power Penning Surface Plasma Ion Source, a 3 solenoid LEBT, a 3 MeV RFQ, a chopper and a comprehensive suite of diagnostics. This paper...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics