Ultrafast spin torque memory based on magnetic tunnel junctions with combined in-plane and perpendicular polarizers

I. N. Krivorotov*, G. E. Rowlands, T. Rahman, J. A. Katine, J. Langer, A. Lyle, H. Zhao, J. G. Alzate, A. A. Kovalev, Y. Tserkovnyak, Z. M. Zeng, H. W. Jiang, K. Galatsis, Y. M. Huai, P. Khalili Amiri, K. L. Wang, J. P. Wang

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Since the initial prediction and experimental demonstration of magnetization reversal by spin transfer torque (STT), there has been continuous progress toward the development of nonvolatile magnetic random access memory based on STT switching (STT-RAM) in nanoscale magnetic tunnel junctions (MTJs). In the most common STT-RAM configuration shown in Fig. 1(a), the magnetic moments of the free layer and the pinned polarizing layer of an MTJ lie collinear to one another in the plane of the junction. In this configuration (in-plane STT-RAM or IST-RAM), STT is small during the initial stages of the free layer's magnetic moment reversal, resulting in a relatively long nanosecond-scale switching time. Switching can be greatly accelerated in an alternative STT-RAM configuration, in which a second polarizer with magnetic moment perpendicular to the MTJ plane is added to the magnetic multilayer (orthogonal STT-RAM or OST-RAM). The initial STT from the perpendicular polarizer is large and has been predicted to induce ultrafast precessional switching of the free layer's magnetization on a time scale of 100 ps. The differences in the reversal modes expected for the IST-RAM and OST-RAM devices are illustrated in Figs. 1(c) and 1(d), wherein magnetization switching trajectories are shown for the two types of memory.

Original languageEnglish (US)
Title of host publication70th Device Research Conference, DRC 2012 - Conference Digest
Number of pages2
StatePublished - 2012
Event70th Device Research Conference, DRC 2012 - University Park, PA, United States
Duration: Jun 18 2012Jun 20 2012

Publication series

NameDevice Research Conference - Conference Digest, DRC
ISSN (Print)1548-3770


Other70th Device Research Conference, DRC 2012
CountryUnited States
CityUniversity Park, PA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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