Ferroelectric data storage reader
AssigneeSeagate Technology LLC
InventorsPeter Jeremy Czoschke, Ali Ghoreyshi
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Abstract
Provided are devices and methods for reading data from rotating ferroelectric data storage media using a reader that includes a channel region disposed between a source and a drain. The data bits, stored as dipoles in the ferroelectric media, induce a current flowing through the channel region of the reader from the source to the drain when a bias voltage is applied to the media. The bias voltage can be tuned for desired reader operation, such as enhancing the signal or operating within a linear response regime.
Claims20
A data storage device comprising:
- rotating media having a ferroelectric layer configured to store bits in first and second dipole states;
- and
- a reader adjacent to the rotating media, the reader comprising a source, a drain, and a channel configured to detect the dipole states stored in the ferroelectric layer based on current flowing through the channel between the source and drain when a bias voltage is applied to the rotating media, the reader being configured to provide a substantially linear signal response between a first signal threshold for detecting the first dipole state and a second signal threshold for detecting a second dipole state.
A method for use with a ferroelectric data storage device that comprises a rotating media having a ferroelectric layer storing data bits in first and second dipole states, comprising the steps of:
- applying a bias voltage to the rotating media;
- positioning a reader adjacent to the rotating media to thereby induce a current to flow through a channel region of the reader disposed between a source and a drain;
- and
- measuring the induced current to thereby detect the first and second dipole states, wherein the reader is configured to provide a substantially linear signal response between a first signal threshold for detecting the first dipole state and a second signal threshold for detecting a second dipole state.
A data storage device comprising:
- rotating media having a ferroelectric layer configured to store bits in first and second dipole states;
- and
- a reader adjacent to the rotating media, the reader comprising a source, a drain, and a channel configured to detect the dipole states stored in the ferroelectric layer based on current flowing through the channel between the source and drain when a bias voltage is applied to the rotating media,
- wherein the first dipole state induces current in the reader above a first threshold voltage, the second dipole state induces current in the reader above a second threshold voltage, and the bias voltage is selected to be between the first threshold voltage and the second threshold voltage.
Dependencies are inferred from the claim text.