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IBM Claims Spintronics Memory Breakthrough

Posted by timothy on from the dance-electrons-dance dept.

CWmike writes with this excerpt from ComputerWorld: "In a paper set to be published this week in the scientific journal Nature, IBM researchers are claiming a huge breakthrough in spintronics, a technology that could significantly boost capacity and lower power use of memory and storage devices. Spintronics, short for 'spin transport electronics,' uses the natural spin of electrons within a magnetic field in combination with a read/write head to lay down and read back bits of data on semiconductor material. By changing an electron's axis in an up or down orientation — all relative to the space in which it exists — physicists are able to have it represent bits of data. For example, an electron on an upward axis is a one; and an electron on a downward axis is a zero. Spintronics has long faced an intrinsic problem because electrons have only held an 'up or down' orientation for 100 picoseconds. A picosecond is one trillionth of a second [one thousandth of a nanosecond.] One hundred picoseconds is not enough time for a compute cycle, so transistors cannot complete a compute function and data storage is not persistent. In the study published in Nature, IBM Research and the Solid State Physics Laboratory at ETH Zurich announced they had found a way to synchronize electrons, which could extend their spin lifetime by 30 times to 1.1 nanoseconds, the time it takes for a 1 GHz processor to cycle."

13 of 77 comments (clear)

  1. Re:Was it really necessary... by Anonymous Coward · · Score: 5, Insightful

    Sure, not everyone one who comes to /. is a long time geek. We all start somewhere.

  2. Likely not by doublebackslash · · Score: 4, Insightful

    Likely not, or not like they claim. Stories like this remind me of Maxwell's Demon. It seems to violate the rules, allows for unlimited energy! Except until you realize that the demon can't be run for free. They claim the breakthrough in stability of the spin states and neglect the cost in space and energy in everything else around it.

    Stop this sensationalism! Give me some science on it and tell me some more details. How do they generate electrons with a single spin? How about a blurb about spintronics already being used in modern hard drive read heads? Cut the nonsense and tittilating lies about promises of the future and tell us the details.

    Geez

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    1. Re:Likely not by GuldKalle · · Score: 3, Insightful

      Just because the product is not in the shops by tomorrow doesn't mean it's sensationalism.
      What we have just witnessed is science. What follows is a lot of optimizations, experiments, cost/benefit analyses, prototyping etc, aka engineering.
      It is a breakthrough because the engineers have gotten a a new tool in their toolbox.
      It is not sensationalism because there are not a extravagant claims.

      Geez

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      What?
    2. Re:Likely not by vlm · · Score: 4, Insightful

      It is not sensationalism because there are not a extravagant claims.

      Its toward the end of the summary, where the only thing preventing spintronic deployment is the refresh rate was immensely way too high, now its merely too high.

      As you listed, there's a lot more work to be done if this is ever deployable. Just lowering the refresh rate from laughable to ridiculous is not enough.

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      "Science flies us to the moon. Religion flies us into buildings." - Victor Stenger
    3. Re:Likely not by docmordin · · Score: 5, Informative

      Give me some science on it and tell me some more details.

      Since they didn't give a link to it, here's the citation for the paper in question: M. P. Walser, et al., "Direct mapping of the formation of a persistent spin helix", Nature Phys., 2012 (accepted, in press). You can read all of the wonderfully gritty, and hard-to-parse, details in that paper.

      If you want to learn more about the science behind spintronics, feel free to peruse:

      M. Johnson and R. H. Silsbee, "Interfacial charge-spin coupling: Injection and detection of spin magnetization in metals", Phys. Rev. Lett. 55: 1790-1793, 1985
      M. N. Baibich, et al., "Giant magnetoresistance of (001)Fe/(001)Cr magnetic superlattices", Phys. Rev. Lett. 61: 2472-2475, 1988
      G. Binasch, et al., "Enhanced magnetoresistance in layered magnetic structures with antiferromagnetic interlayer exchange", Phys. Rev. B 29: 4828, 1989
      S. Datta and B. Das, "Electronic analog of the electrooptic modulator", Appl. Phys. Lett. 56: 665-667, 1990
      J. Kikkawa and D. Awschalom, "Resonant spin amplification in n-type GaAs", Phys. Rev. Lett. 80: 4313, 1998
      B. T. Jonker, et al., "Robust electrical spin injection into a semiconductor heterostructure", Phys. Rev. B 62: 8180-8183, 2000
      A. T. Hanbicki, et al., "Efficient electrical spin injection from a magnetic metal/tunnel barrier contact into a semiconductor", Appl. Phys. Lett. 80: 1240, 2002
      S. van Dijken, et al., "Room temperature operation of a high output current magnetic tunnel transistor", Appl. Phys. Lett. 80: 3364-3366, 2002
      X. Jiang, et al., "Optical detection of hot-electron spin injection into GaAs from a magnetic tunnel transistor source", Phys. Rev. Lett. 90: 256603, 2003
      J. Schliemann, et al., "Nonballistic spin-field-effect transistor", Phys. Rev. Lett. 90: 146801, 2003
      B. A. Bernevig, et al., "Exact SU(2) symmetry and persistent spin helix in a spin-orbit coupled system", Phys. Rev. Lett. 97: 236601: 2006
      X. Lou, et al., "Electrical detection of spin transport in lateral ferromagnet–semiconductor devices", Nature Phys. 3: 197-202, 2007
      M. Holub, et al., "Electrical spin injection and threshold reduction in a semiconductor laser", Phys. Rev. Lett. 98: 146603, 2007
      I. Appelbaum, et al., "Electronic measurement and control of spin transport in silicon", Nature 447: 295-298, 2007
      M. Duckheim and D. Loss, "Resonant spin polarization and spin current in a two-dimensional electron gas", Phys. Rev. B 75: 201305, 2007
      B. Behin-Aein, et al., "Proposal for an all-spin logic device with built-in memory", Nature Nano. 5: 266-270, 2010
      J. Wunderlich, et al., "Spin Hall effect transistor", Science 330: 1801-1804, 2010

      How about a blurb about spintronics already being used in modern hard drive read heads?

      I can do better than a blurb, I can provide you with references to the underlying science:

      M. Julliere, "Tunneling between ferromagnetic films", Phys. Lett. 54: 225-226, 1975
      J. S. Moodera, et al. "Large magnetoresistance at room temperature in ferromagnetic thin film tunnel junctions", Phys. Rev. Lett. 74: 3273-3276
      W. H. Butler, et al., "Spin-dependent tunneling conductance of Fe/MgO/Fe sandwiches", Phys. Rev. B. 63: 054416, 2001
      J. Mathon and A. Umerski, "Theory of tunneling magnetoresistance of an epitaxial Fe/MgO/Fe (001) junction", Phys. Rev. B. 63: 220403, 2001
      M. Bowen, et al., "Large magnetoresistance in Fe/MgO/FeCo(001) epitaxial tunnel junctions on GaAs(001)", Appl. Phys. Lett. 79: 1655, 2001
      S. Yuasa, et al., "Giant room-temperature magnetoresistance in single-crystal Fe/MgO/Fe magnetic tunnel junctions", Nature Mater. 3: 868-871, 2004
      S. S. P. Parkin, et al., "Giant tunnelling magnetoresistance at room temperature with MgO (100) tunnel barriers" Nature Mater. 3: 862-867, 2004
      S. Ikeda, et al., "Tunnel magnetoresistance of 604% at 300 K by suppression of Ta diffusion in CoFeB/MgO/CoFeB pseudo-spin-valves annealed at high temperature", Appl. Phys. Lett. 93: 082508, 2008

  3. Re:Was it really necessary... by inasity_rules · · Score: 3, Insightful

    Yes, this is an america-centric site, as we are often reminded, and you guys don't like SI units... :P

    Queue the Metric/Imperial Wars:

    In all seriousness, they could have just given the frequency and we'd have been fine. That refresh rate is very doable with a dedicated controller.

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    I have determined that my sig is indeterminate.
  4. Re:Was it really necessary... by petteyg359 · · Score: 3, Funny

    I don't see any cone intersections in his text. Perhaps you meant ellipsis...

  5. Re:etch a sketch? by vlm · · Score: 3, Informative

    I mean how hard I can shake it compared to the mass and energy of a tiny spinning particle, it could start spinning a different way, right?

    LOL you wish. The story of chemistry and physics would be a lot different if that were true for protons. I've fooled around with proton magnetometers and NMR machines in chemistry lab and its not so simple to align proton spins. In fact its really freaking hard and energy intensive to align particle spins in general, not just proton spins. This would make an awesome basis for a hard sci-fi story, however. Someone please write a story about a steampunk NMR machine, so I can buy it. I think a Nikola Tesla who invented a steampunk NMR machine in 1870 would be much more interesting than yet another "vampire Tesla". My brain is feeling especially warped today and I'd also like to request a pre-quel involving a steampunk fourier transform infra red spectroscopy analyzer. I would have to think for a minute if there's any technical reason why Fourier himself couldn't have built a FTIR in his era. Hmm glowing charcoal as a IR source, and an early thermometer and lens arrangement as a ghetto IR bolometer, feeding reams of measurement data to hundreds of human clerks making calculations for years to generate each IR spectra, plus or minus an analytical engine or two... Hell a Beowulf cluster of analytical engines...

    As for aligning electron spins like this article its still a huge PITA but the electromagnetic world depends on it. I can't think of any ferromagnetic material that can be (de)magnetized by waving it around... hammer blow level impact will realign the domains but just shakin it isn't going to do it. The reason why can be found on the wikipedia article for coercivity where basically the stuff you make recording media out of doesn't want to demagnetize without a serious fight.

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    "Science flies us to the moon. Religion flies us into buildings." - Victor Stenger
  6. Re:Was it really necessary... by timeOday · · Score: 4, Funny

    Put another way, if 100 slashdotters had to answer the question "pico = 10^x", does anybody really think we'd all get it right?

  7. Re:Was it really necessary... by Jade_Wayfarer · · Score: 5, Funny

    1 hectoslashdotter cannot be wrong!

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    Absence of proof != proof of absence.
  8. Re:Was it really necessary... by Anonymous Coward · · Score: 3, Insightful

    I absolutely hate posts that put part of the reply into the subject line, and you should burn for encouraging it.

  9. Math is hard by PTBarnum · · Score: 3, Interesting

    Since when does 100 picoseconds * 30 = 1.1 nanoseconds?

  10. Re:Was it really necessary... by cellocgw · · Score: 4, Funny

    Queue the Metric/Imperial Wars:

    So "Queue" is the metric equivalent of "Cue" ?

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