SURFACE ACOUSTIC WAVE-BASED SENSING AND ACTUATION OF CONTAMINATION
First Claim
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1. A method, comprising:
- producing a first surface acoustic wave (SAW) on a magnetic head slider using a first interdigitated transducer (IDT), wherein the SAW has a first set of wave characteristics;
receiving the first SAW at a second IDT on the magnetic head slider;
analyzing the SAW for a second set of wave characteristics; and
determining, based on the analyzing, that a substance having at least one characteristic is located in a path of the SAW on the magnetic head slider.
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Abstract
A method includes producing a first surface acoustic wave (SAW) on a magnetic head slider using a first interdigitated transducer (IDT), wherein the SAW has a first set of wave characteristics. The method also includes receiving the first SAW at a second IDT on the magnetic head slider. The method also includes analyzing the SAW for a second set of wave characteristics. The method also includes determining, based on the analyzing, that a substance having at least one characteristic is located in a path of the SAW on the magnetic head slider.
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Citations
20 Claims
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1. A method, comprising:
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producing a first surface acoustic wave (SAW) on a magnetic head slider using a first interdigitated transducer (IDT), wherein the SAW has a first set of wave characteristics; receiving the first SAW at a second IDT on the magnetic head slider; analyzing the SAW for a second set of wave characteristics; and determining, based on the analyzing, that a substance having at least one characteristic is located in a path of the SAW on the magnetic head slider. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A head slider apparatus for use in a hard-disk drive, comprising:
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a controller in communication with a first interdigitated transducer (IDT) and a second IDT; a leading edge, a trailing edge, and an air bearing surface; the first IDT being located on the trailing edge and having a first interdigitated spacing configured to interface with a piezoelectric substrate to create a first surface acoustic wave (SAW) having an first wavelength and an first amplitude; the second IDT configured to receive the first SAW created by the first interdigitated transducer, the received first SAW having a second wavelength and second amplitude; and wherein the controller is configured to analyze the received first SAW by comparing the second wavelength to the first wavelength and the second amplitude to the first amplitude, to determine whether a contaminant is located on the trailing edge. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A head slider apparatus for use in a hard disk drive, comprising:
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a controller in communication with a first interdigitated transducer (IDT) and a second IDT; a leading edge, a trailing edge, and an air bearing surface; the first IDT being located on the air bearing surface and having a first interdigitated spacing configured to interface with a piezoelectric substrate to create a first surface acoustic wave (SAW) having an first wavelength and an first amplitude; the second IDT configured to receive the first SAW created by the first interdigitated transducer, the received first SAW having a second wavelength and second amplitude; and wherein the controller is configured to analyze the received first SAW by comparing the second wavelength to the first wavelength and the second amplitude to the first amplitude, to determine whether a contaminant is located on the air bearing surface. - View Dependent Claims (15)
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16. A method, comprising:
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receiving a first set of wave characteristics; determining, based on the first set of wave characteristics, that a substance having at least one characteristic is located on a trailing edge surface of a magnetic head slider; and producing a first surface acoustic wave (SAW) on the trailing edge surface of the magnetic head slider using a first interdigitated transducer (IDT), based on the first set of wave characteristics such that the substance is actuated. - View Dependent Claims (17, 18, 19, 20)
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Specification