# US 2008/0186612 A1 · Thermally reversible cross-linked poly (aryl ether ketone) media and method for high density data storage > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2008/0186612 A1 - Document ID: US20080186612A1 - Status: Published application - Kind: A1 - Application number: 12/058,937 - Filed: 2008-03-31 - Published: 2008-08-07 - Earliest claimed: 2007-01-24 - Assignees: International Business Machines Corporation - Inventors: Richard Anthony DiPietro; Urs T. Duerig; Jane Elizabeth Frommer; Bernd Walter Gotsmann; James Lupton Hedrick; Armin W. Knoll; Teddie Peregrino Magbitang; Robert Dennis Miller; Russell Clayton Pratt - Web page: https://patentgrep.com/patent/US20080186612A1 ## CPC - G11B 9/149: {characterised by the memorising material or structure} - B82Y 10/00: Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic - G11B 9/1472: {characterised by the form} - G11B 11/007: {with reproducing by means directly associated with the tip of a microscopic electrical probe as defined in G11B9/14 (details of heads G11B9/1409; disposition or mounting of heads G11B9/1418)} - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES ## Abstract A composition of matter for a recording medium in atomic force data storage devices. The composition includes one or more poly(aryl ether ketone) copolymers, each of the one or more poly(aryl ether ketone) copolymers including (a) a first monomer including an aryl ether ketone and (b) a second monomer including an aryl ether ketone and a hydrogen bonding cross-linking moiety, the moiety capable of forming two or more hydrogen bonds at room temperature, each of the one or more poly(aryl ether ketone) copolymers having two terminal ends, each terminal end having a phenylethynyl moiety. The covalent and hydrogen bonding cross-linking of the poly(aryl ether ketone) oligomers may be tuned to match thermal and force parameters required in read-write-erase cycles. ## Claims ### Claim 1 A composition of matter, comprising: one or more poly(aryl ether ketone) copolymers, each of said one or more poly(aryl ether ketone) copolymers comprising (a) a first monomer including an aryl ether ketone and (b) a second monomer including an aryl ether ketone and a hydrogen bonding cross-linking moiety, said moiety capable of forming two or more hydrogen bonds at room temperature, each of said one or more poly(aryl ether ketone) copolymers having two terminal ends, each terminal end having a phenylethynyl moiety. ### Claim 2 (depends on 1) The composition of matter of claim 1, wherein each poly(aryl ether ketone) copolymer of said one or more poly(aryl ether ketone) copolymers includes: (i) m repeat units represented by the structure —R1—O—R2—O— interspersed with n repeat units represented by the structure —R3—O—R2—O—, each repeat unit of said m repeat units terminated by a first terminal group represented by the structure R4—O— and a second terminal group represented by the structure —R1—O—R4; or (ii) m repeat units represented by the structure —R1—O—R2—O— interspersed with n repeat units represented by the structure —R1—O—R2—O—, each repeat unit of said m repeat units terminated by a first terminal group represented by the structure R6—O—R2— and a second terminal group represented by the structure —R6; wherein O=oxygen, and occurs as a link between all R groups; wherein R1 is selected from the group consisting of: wherein R2 is selected from the group consisting of: wherein R3 is selected from the group consisting of wherein R5 is selected from the group consisting of wherein R4 is selected from the group consisting of mono(arylacetylenes), mono(phenylethynyls), wherein R6 is selected from the group consisting of mono(arylacetylenes), mono(phenylethynyls), wherein, for either (i) or (ii), m and n are integers of 1 or more, m+n is from about 3 to about 30, and the ratio m/n is about 2 or more. ### Claim 3 (depends on 2) The composition of claim 2, further including a reactive diluent selected from the group consisting of where R7, R8 and R9 are each independently selected from the group consisting of hydrogen, alkyl groups, aryl groups, cycloalkyl groups, alkoxy groups, aryloxy groups, alkylamino groups, arylamino groups, alkylarylamino groups, arylthio, alkylthio groups and ### Claim 4 (depends on 2) The composition of matter of claim 2, wherein, in (i) and (ii) said m repeat units and said n repeat units are randomly interspersed. ### Claim 5 (depends on 1) The composition of matter of claim 1, wherein, in (ii) the ratio m/n is equal to or greater than about 2. ### Claim 6 (depends on 1) The composition of matter of claim 1, wherein each of said one or more poly(aryl ether ketone) copolymers has a molecular weight between about 3,000 Daltons and about 20,000 Daltons. ### Claim 7 (depends on 1) The composition of matter of claim 1, wherein each of said one or more poly(aryl ether ketone) copolymers has a molecular weight between about 4,000 Daltons and about 8,000 Daltons. ### Claim 8 (depends on 1) A method, comprising: heating said one or more poly(aryl ether ketone) copolymers of claim 1 to form a poly(aryl ether ketone) resin, said poly(aryl ether ketone) resin covalently cross-linked by cyclo-addition reactions of said phenylethynyl moieties. ### Claim 9 (depends on 8) The method of claim 8, wherein said poly(aryl ether ketone) resin has a glass transition temperature of less than 180° C. ### Claim 10 A method, comprising: forming a layer of poly(aryl ether ketone) resin by applying a layer of one or more poly(aryl ether ketone) copolymers and thermally curing said layer of one or more poly(aryl ether ketone) copolymers, each of said one or more poly(aryl ether ketone) copolymers comprising (a) a first monomer including an aryl ether ketone and (b) a second monomer including an aryl ether ketone and a hydrogen bonding cross-linking moiety, said moiety capable of forming two or more hydrogen bonds at room temperature, each of said one or more poly(aryl ether ketone) copolymers having two terminal ends, each terminal end having a phenylethynyl moiety, and bringing a thermal-mechanical probe heated to a temperature of greater than about 100° C. into proximity with said layer of a poly(aryl ether ketone) resin multiple times to induce deformed regions at points in said layer of said poly(aryl ether ketone) resin, said thermal mechanical probe heating said points in said layer of said resin and thereby writing information in said layer of said resin. ### Claim 11 (depends on 10) The method of claim 10, further including: bringing said thermal-mechanical probe into proximity with said points to read said information. ### Claim 12 (depends on 10) The method of claim 10, further including: bringing said thermal-mechanical probe into proximity with one or more of said deformed regions in said layer of said poly(aryl ether ketone) resin, said thermal mechanical point heated to a temperature of greater than about 100° C.; and heating said one or more of said deformed regions to deform said one or more of said deformed regions in such a way as to eliminate said one or more deformed regions and erase said information. ### Claim 13 (depends on 10) The method of claim 10, wherein each of said one or more poly(aryl ether ketone) copolymers are covalently cross-linked by cyclo-addition of said phenylethynyl moieties during said curing. ### Claim 14 (depends on 10) The method of claim 10, wherein said curing is performed at a temperature between about 300° C. and about 400° C. ### Claim 15 (depends on 10) The method of claim 10, wherein said poly(aryl ether ketone) resin has a glass transition temperature of less than 180° C. ### Claim 16 (depends on 10) The method of claim 10, wherein each poly(aryl ether ketone) copolymer of said one or more poly(aryl ether ketone) copolymers includes: (i) m repeat units represented by the structure —R1—O—R2—O— interspersed with n repeat units represented by the structure —R3—O—R2—O—, each repeat unit of said m repeat units terminated by a first terminal group represented by the structure R4—O— and a second terminal group represented by the structure —R1—O—R4; or (ii) m repeat units represented by the structure —R1—O—R2—O— interspersed with n repeat units represented by the structure —R3—O—R2—O—, each repeat unit of said m repeat units terminated by a first terminal group represented by the structure R6—O—R2— and a second terminal group represented by the structure —R6; wherein O=oxygen, and occurs as a link between all R groups; wherein R1 is selected from the group consisting of: wherein R2 is selected from the group consisting of: wherein R3 is selected from the group consisting of wherein R5 is selected from the group consisting of wherein R4 is selected from the group consisting of mono(arylacetylenes), mono(phenylethynyls), wherein R6 is selected from the group consisting of mono(arylacetylenes), mono(phenylethynyls), wherein, for either (i) or (ii), m and n are integers of 1 or more, m+n is from about 3 to about 30, and the ratio m/n is about 2 or more. ### Claim 17 (depends on 16) The method of claim 16, wherein said layer of one or more poly(aryl ether ketone) copolymers further includes a reactive diluent selected from the group consisting of where R7, R8 and R9 are each independently selected from the group consisting of hydrogen, alkyl groups, aryl groups, cycloalkyl groups, alkoxy groups, aryloxy groups, alkylamino groups, arylamino groups, alkylarylamino groups, arylthio, alkylthio groups and ### Claim 18 (depends on 16) The method of claim 16, wherein, in (i) and (ii) said m repeat units and said n repeat units are randomly interspersed. ### Claim 19 A data storage device, comprising: a recording medium comprising a layer of poly(aryl ether ketone) resin overlying a substrate, in which topographical states of said layer of said poly(aryl ether ketone) resin represent data, said poly(aryl ether ketone) resin comprising thermally cured one or more poly(aryl ether ketone) copolymers, each of said one or more poly(aryl ether ketone) copolymers comprising (a) a first monomer including an aryl ether ketone and (b) a second monomer including an aryl ether ketone and a hydrogen bonding cross-linking moiety, said moiety capable of forming two or more hydrogen bonds at room temperature, each of said one or more poly(aryl ether ketone) copolymers having two terminal ends, each terminal end having a phenylethynyl moiety; a read-write head having one or more thermo-mechanical probes, each of said one or more thermo-mechanical probes including a resistive region for locally heating a tip of said thermo-mechanical probe in response to electrical current being applied to said one or more thermo-mechanical probes; and a scanning system for scanning said read-write head across a surface of said recording medium. ### Claim 20 (depends on 19) The data storage device of claim 19, wherein each poly(aryl ether ketone) copolymer of said one or more poly(aryl ether ketone) copolymers includes: (i) m repeat units represented by the structure —R1—O—R2—O— interspersed with n repeat units represented by the structure —R3—O—R2—O—, each repeat unit of said m repeat units terminated by a first terminal group represented by the structure R4—O— and a second terminal group represented by the structure —R1—O—R4; or (ii) m repeat units represented by the structure —R1—O—R2—O— interspersed with n repeat units represented by the structure —R3—O—R2—O—, each repeat unit of said m repeat units terminated by a first terminal group represented by the structure R6—O—R2— and a second terminal group represented by the structure —R6; wherein O=oxygen, and occurs as a link between all R groups; wherein R1 is selected from the group consisting of: wherein R2 is selected from the group consisting of: wherein R3 is selected from the group consisting of wherein R5 is selected from the group consisting of wherein R4 is selected from the group consisting of mono(arylacetylenes), mono(phenylethynyls), wherein R6 is selected from the group consisting of mono(arylacetylenes), mono(phenylethynyls), wherein, for either (i) or (ii), m and n are integers of 1 or more, m+n is from about 3 to about 30, and the ratio m/n is about 2 or more. ### Claim 21 (depends on 20) The data storage device of claim 20, wherein said thermally cured one or more poly(aryl ether ketone) copolymers are cross-linked by a moiety derived from a reactive diluent selected from the group consisting of where R7, R8 and R9 are each independently selected from the group consisting of hydrogen, alkyl groups, aryl groups, cycloalkyl groups, alkoxy groups, aryloxy groups, alkylamino groups, arylamino groups, alkylarylamino groups, arylthio, alkylthio groups and ### Claim 22 (depends on 20) The data storage device of claim 20, wherein, in structures (i) and (ii) said m repeat units and said n repeat units are randomly interspersed. ### Claim 23 (depends on 19) The data storage device of claim 19, further including: a heat control circuit for independently applying said electrical current to each of said one or more thermo-mechanical probes; a write control circuit for independently controlling heating of each of said one or more thermo-mechanical probes by said heat control circuit to write data bits to said recording medium; an erase control circuit for independently controlling heating of each of said one or more thermo-mechanical probes by said heat control circuit to erase data bits from said recording medium; and a read control circuit for independently reading data bits from said recording medium with each of said one or more thermo-mechanical probes. ### Claim 24 (depends on 19) The data storage device of claim 19, further including: a contact mechanism for contacting said recording medium with respective tips of said one or more thermo-mechanical probes. ### Claim 25 (depends on 19) The data storage device of claim 19, wherein said poly(aryl ether ketone) resin layer has a thickness between about 10 nm and about 500 nm.