Nonvolatile corruption resistent magnetic memory and method thereof
AssigneeU.S. Army Research Laboratory ATTN: RDRL-LOC-I
InventorsALAN S. EDELSTEIN, JONATHAN R. PETRIE
Life of this patent
Estimating the term…
Abstract
A method and system for storing information in a nonvolatile memory comprising: a substrate comprising magnetic material operatively associated therewith, the magnetic material having at least one first portion of low permeability and at least one second portion of high permeability; a reader comprising a sensor for reading information by measuring the magnetic permeability for the at least one first portion and the at least one second portion; whereby the at least one first and second portions are subjected to a magnetic probe field from one of an external source, the sensor, or a combination of an external source and the sensor.
Claims20
A system for storing information in a nonvolatile memory comprising:
- a substrate;
- magnetic material operatively associated with the substrate, the magnetic material having at least one first portion of low permeability and at least one second portion of high permeability;
- at least one magnetic probe field;
- the at least one first and second portions being subjected to the at least one magnetic probe field;
- a reader comprising a sensor in close proximity to the at least one first and second portions that reads information by detecting changes in the at least one magnetic probe field dependent on the magnetic permeability of the at least first and second portions.
A method of reading information from a magnetic medium based upon the magnetic permeability comprising:
- providing at least one first portion and at least one second portion of varying magnetic permeability on a medium;
- subjecting the at least one first and second portions to a magnetic probe field;
- aligning a reader in close proximity to the medium;
- measuring the response of the reader;
- reading information by detecting changes in the at least one magnetic probe field dependent on the magnetic permeability of the at least first and second portions.
The system for storing information in a nonvolatile memory comprising:
- a medium comprising magnetic material having at least one first portion of low permeability and at least one second portion of high permeability;
- the portions of low permeability being formed in the medium by heating the portions with a laser, hot tip or joule heating;
- at least one magnetic probe field;
- a spin torque oscillator reader comprising a sensor for reading information by placing the sensor in close proximity to one of a first or second portion and measuring the microwave frequency shift outputted by the spin torque oscillator;
- a mixer operatively connected to the spin torque oscillator which determines a frequency differential between the outputted frequency and a predetermined frequency;
- a comparator operatively associated with the mixer for comparing the frequency differential to a threshold frequency differential;
- at least one processor operatively associated with the comparator for outputting a binary bit in response to whether or not the frequency differential exceeds the threshold differential.
Dependencies are inferred from the claim text.