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Magnetic tunnel junction based chip identification

  • US 9,569,712 B1
  • Filed: 05/27/2016
  • Issued: 02/14/2017
  • Est. Priority Date: 12/15/2015
  • Status: Active Grant
First Claim
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1. A method of generating a fingerprint for an array of a plurality of MTJ elements, the method comprising:

  • sensing a first MTJ element by subjecting the first MTJ element in the plurality of MTJ elements to a voltage to generate data for the first element in the plurality of the MTJ elements relative to a first reference data and provide a first sensed MTJ element;

    sensing a second MTJ element by subjecting the second MTJ element in the plurality of MTJ elements to a voltage to generate data for the second element in the plurality of the MTJ elements relative to a second reference data and provide a second sensed MTJ element;

    continuing to sequentially sense a predetermined number of MTJ elements in the array of the plurality of MTJ elements by sequentially subjecting subsequent MTJ elements in the array of the plurality of MTJ elements to a voltage to generate data for the subsequent MTJ elements in the array of the plurality of MTJ elements relative to a respective sequential reference data for each of the MTJ elements being sensed and provide a predetermined number of sensed MTJ elements; and

    collecting the generated data for the sensed MTJ elements to generate a permanent string of the data associated with the array of the MTJ elements, wherein a portion or all of the permanent string of data for the MTJ array comprises an oxygen mask.

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