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US 7,397,624 B2Granted
Transducers for ferroelectric storage medium
AssigneeSeagate Technology LLC
InventorsEarl C. Johns, Mark I. Lutwyche, Yiao-Tee Hsia, James D. Kiely
Life of this patent
Estimating the term…
Abstract
A ferroelectric transducer for use with a ferroelectric storage medium includes a read electrode. The read electrode emits a current when a polarity orientation of the read electrode is opposite a polarity orientation of a ferroelectric domain on the storage medium.
Claims26
A ferroelectric transducer for use with a ferroelectric storage medium, comprising:
- a read electrode that carries an electrical charge of a first charge polarity orientation proximate a ferroelectric domain of the ferroelectric storage medium which has a second charge polarity orientation;
- an electric shield which extends around the read electrode arranged to confine an electric field and thereby reduce noise sensed by the read electrode and increase spacial resolution of the read electrode;
- and
- wherein the ferroelectric domain changes polarity and an electrical readback current flows in the read electrode when the first charge polarity orientation and the second charge polarity orientation are opposite.
1 more element
A data storage system comprising:
- a ferroelectric transducer that moves relative to a ferroelectric storage medium, the ferroelectric transducer comprising:
- a read electrode that carries an electrical charge of a first charge polarity orientation proximate a ferroelectric domain of the ferroelectric storage medium which has a second charge polarity orientation;
- an electric shield which extends around the read electrode arranged to confine an electric field and thereby reduce noise sensed by the read electrode and increase spacial resolution of the read electrode;
- and wherein the ferroelectric domain changes polarity and an electrical readback current flows in the read electrode when the first charge polarity orientation and the second charge polarity orientation are opposite.
1 more element
A storage system comprising:
- a ferroelectric storage medium;
- an array of ferroelectric transducers;
- and an actuator that moves the storage medium relative to the array, wherein each ferroelectric transducer of the array of ferroelectric transducers comprises:
- a read electrode that carries an electrical charge of a first charge polarity orientation proximate a ferroelectric domain of the ferroelectric storage medium which has a second charge polarity orientation;
- an electric shield which extends around the read electrode arranged to confine an electric field and thereby reduce noise sensed by the read electrode and increase spacial resolution of the read electrode;
- and wherein the ferroelectric domain changes polarity and an electrical readback current flows in the read electrode when the first charge polarity orientation and the second charge polarity orientation are opposite.
3 more elements
A method of reading data stored on a ferroelectric storage medium, comprising:
- applying an electric charge to a read electrode placed proximate a ferroelectric domain having a first charge polarity on the ferroelectric medium;
- shielding the read electrode with an electric shield, which extends around the read electrode, to confine an electric field and thereby reduce noise sensed by the read electrode and increase spacial resolution;
- and
- sensing an electrical current in the read electrode due to the charge polarity of the ferroelectric domain switching from the first charge polarity to a second charge polarity when the first charge polarity is the same as a charge polarity of the read electrode.
1 more element
A method implemented in a disc storage system having a ferroelectric transducer that reads data stored on a ferroelectric storage medium, the method comprising:
- applying an electric charge to a read electrode placed proximate a ferroelectric domain having a first charge polarity on the ferroelectric medium;
- shielding the read electrode with an electric shield, which extends around the read electrode, to confine an electric field and thereby reduce noise sensed by the read electrode and increase spacial resolution;
- and sensing an electrical current in the read electrode due to the charge polarity of the ferroelectric domain switching from the first charge polarity to a second charge polarity when the first charge polarity is the same as a charge polarity of the read electrode.
A ferroelectric transducer for use with a ferroelectric storage medium, comprising:
- a read electrode means placed proximate a ferroelectric domain having a first charge polarity on the ferroelectric medium the read electrode means for sensing electrical charge of the ferroelectric domain;
- electric shield means extending around the read electrode for shielding the read electrode from noise and increasing spacial resolution of the read electrode by confining an electric field;
- and
- means for sensing an electrical current from in the read electrode means due to the charge polarity of the ferroelectric domain switching from the first charge polarity to a second charge polarity when the first charge polarity is the same as a charge polarity of the read electrode means.
1 more element
Dependencies are inferred from the claim text.