# US 8,787,130 B1 · Systems and methods for providing heat assisted magnetic recording media configured to couple energy from a near field transducer > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,787,130 B1 - Document ID: US8787130B1 - Status: Granted - Kind: B1 - Application number: 13/931,812 - Filed: 2013-06-29 - Granted: 2014-07-22 - Earliest claimed: 2013-03-15 - Assignees: WD Media, LLC - Applicants: WD Media, LLC - Inventors: Hua Yuan; Bogdan F. Valcu; Antony Ajan; B. Ramamurthy Acharya; Alexander S. Chernyshov; Paul C. Dorsey - Web page: https://patentgrep.com/patent/US8787130B1 ## CPC - G11B 5/314: {where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers (G11B5/3196 takes precedence)} - G11B 5/6088: {Optical waveguide in or on flying head} - G11B 5/658: {containing oxygen, e.g. molecular oxygen or magnetic oxide} - G11B 5/72: Protective coatings, e.g. anti-static {or antifriction} - G11B 2005/0021: {Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal} - 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) ## Abstract Systems and methods for providing heat assisted magnetic recording (HAMR) media configured to couple energy from a near field transducer (NFT) are provided. One such method includes providing a magnetic recording layer including an L10 ordered FePt or an L10 ordered CoPt, selecting a plurality of preselected parameters for a coupling layer, the preselected parameters including a material, a preselected deposition temperature, and a preselected thickness, and depositing the coupling layer directly on the magnetic recording layer using the preselected parameters such that the coupling layer has an extinction coefficient greater than 0.1. ## Claims ### Claim 1 A method for fabricating a media for heat assisted magnetic recording, the method comprising: providing a magnetic recording layer comprising materials selected from the group consisting of an L10 ordered FePt, an L10 ordered CoPt, an L10 ordered FePd, and combinations thereof; selecting a plurality of preselected parameters for a coupling layer, the preselected parameters comprising a material, a preselected deposition temperature, and a preselected thickness; and depositing the coupling layer directly on the magnetic recording layer using the preselected parameters such that the coupling layer has an extinction coefficient greater than 0.1. ### Claim 2 (depends on 1) The method of claim 1, wherein the material of the coupling layer is selected from the group consisting of Ta, Pt, Ru, Ag, Au, Cu, Al, NiTa, C, SiC, SiN, TiC, TiN, and combinations thereof. ### Claim 3 (depends on 1) The method of claim 1, wherein the material of the coupling layer comprises C. ### Claim 4 (depends on 3) The method of claim 3, wherein a density of the coupling layer is in a range from about 1.5 g/cm3 to about 1.7 g/cm3. ### Claim 5 (depends on 3) The method of claim 3: wherein the coupling layer is configured to efficiently couple light energy from a near field transducer (NFT) of a heat assisted magnetic recording system, wherein the NFT is positioned proximate the media; and wherein the coupling layer comprises characteristics to facilitate light energy absorption from the NFT, the characteristics comprising a refractive index in a range from about 2 to about 2.3. ### Claim 6 (depends on 5) The method of claim 5, wherein, at a wavelength of light applied to the media of greater than about 600 nanometers, the refractive index is equal to about 2.3 and the extinction coefficient is equal to about 0.5. ### Claim 7 (depends on 3) The method of claim 3, wherein the preselected deposition temperature is in a range from about 90 degrees Celsius to about 150 degrees Celsius, and the preselected thickness is in a range from about 1.5 nanometers to about 8 nanometers. ### Claim 8 (depends on 1) The method of claim 1, wherein the preselected deposition temperature is in a range from about 90 degrees Celsius to about 150 degrees Celsius, and the preselected thickness is in a range from about 1.5 nanometers to about 8 nanometers. ### Claim 9 (depends on 1) The method of claim 1, wherein the depositing the coupling layer directly on the magnetic recording layer comprises depositing the coupling layer directly on the magnetic recording layer using sputter deposition. ### Claim 10 (depends on 1) The method of claim 1, wherein the coupling layer is configured to efficiently couple light energy from a near field transducer (NFT) of a heat assisted magnetic recording system, wherein the NFT is positioned proximate the media. ### Claim 11 (depends on 1) The method of claim 1, further comprising providing a heatsink layer, wherein the magnetic recording layer is on the heatsink layer. ### Claim 12 (depends on 1) The method of claim 1, wherein the magnetic recording layer comprises materials selected from the group consisting of FePtXY, CoPtXY, and FePdXY, where X is selected from the group consisting of Ag, Cu, Ni, BN, B, SiO2, SiN, SiC, C and combinations thereof, and where Y is selected from the group consisting of ZrO2, TiO2, MgO, ZrO2, Cr2O3, Ta2O5, NbO5, HfO2, WO3, Y2O3, B2O3, Al2O3, and combinations thereof. ### Claim 13 (depends on 1) The method of claim 1, further comprising: providing a glass substrate; providing an adhesion layer on the glass substrate; providing a heatsink layer on the adhesion layer; providing an underlayer on the heatsink layer, wherein the magnetic recording layer is on the underlayer; and providing a lubricant layer on the coupling layer. ### Claim 14 (depends on 13) The method of claim 13, further comprising providing a soft magnetic underlayer between the heatsink layer and the adhesion layer. ### Claim 15 (depends on 13) The method of claim 13, further comprising providing a soft magnetic underlayer between the underlayer and the heatsink layer. ### Claim 16 A media for heat assisted magnetic recording, the media comprising: a magnetic recording layer comprising materials selected from the group consisting of an L10 ordered FePt, an L10 ordered CoPt, an L10 ordered FePd, and combinations thereof; and a coupling layer directly on the magnetic recording layer and deposited using preselected parameters comprising a preselected temperature and a preselected thickness of the coupling layer, wherein the coupling layer has an extinction coefficient greater than 0.1. ### Claim 17 (depends on 16) The media of claim 16, wherein the coupling layer comprises a material selected from the group consisting of Ta, Pt, Ru, Ag, Au, Cu, Al, NiTa, C, SiC, SiN, TiC, TiN, and combinations thereof. ### Claim 18 (depends on 16) The media of claim 16, wherein the coupling layer comprises C. ### Claim 19 (depends on 18) The media of claim 18, wherein a density of the coupling layer is in a range from about 1.5 g/cm3 to about 1.7 g/cm3. ### Claim 20 (depends on 18) The media of claim 18: wherein the coupling layer is configured to efficiently couple light energy from a near field transducer (NFT) of a heat assisted magnetic recording system, wherein the NFT is positioned proximate the media; and wherein the coupling layer comprises characteristics to facilitate light energy absorption from the NFT, the characteristics comprising a refractive index in a range from about 2 to about 2.3. ### Claim 21 (depends on 20) The media of claim 20, wherein, at a wavelength of light applied to the media of greater than about 600 nanometers, the refractive index is equal to about 2.3 and the extinction coefficient is equal to about 0.5. ### Claim 22 (depends on 18) The media of claim 18, wherein the preselected temperature is in a range from about 90 degrees Celsius to about 150 degrees Celsius, and the preselected thickness is in a range from about 1.5 nanometers to about 8 nanometers. ### Claim 23 (depends on 16) The media of claim 16, wherein the preselected temperature is in a range from about 90 degrees Celsius to about 150 degrees Celsius, and the preselected thickness is in a range from about 1.5 nanometers to about 8 nanometers. ### Claim 24 (depends on 16) The media of claim 16, wherein the coupling layer is deposited using sputter deposition. ### Claim 25 (depends on 16) The media of claim 16, wherein the coupling layer is configured to efficiently couple light energy from a near field transducer (NFT) of a heat assisted magnetic recording system, wherein the NFT is positioned proximate the media. ### Claim 26 (depends on 16) The media of claim 16, further comprising a heatsink layer, wherein the magnetic recording layer is on the heatsink layer. ### Claim 27 (depends on 16) The media of claim 16, wherein the magnetic recording layer comprises materials selected from the group consisting of FePtXY, CoPtXY, and FePdXY, where X is selected from the group consisting of Ag, Cu, Ni, BN, B, SiO2, SiN, SiC, C, and combinations thereof, and where Y is selected from the group consisting of ZrO2, TiO2, MgO, ZrO2, Cr2O3, Ta2O5, NbO5, HfO2, WO3, Y2O3, B2O3, Al2O3, and combinations thereof. ### Claim 28 (depends on 16) The media of claim 16, further comprising: a glass substrate; an adhesion layer on the glass substrate; a heatsink layer on the adhesion layer; an underlayer on the heatsink layer, wherein the magnetic recording layer is on the underlayer; and a lubricant layer on the coupling layer. ### Claim 29 (depends on 28) The media of claim 28, further comprising a soft magnetic underlayer between the heatsink layer and the adhesion layer. ### Claim 30 (depends on 28) The media of claim 28, further comprising a soft magnetic underlayer between the underlayer and the heatsink layer. ### Claim 31 (depends on 16) A heat assisted magnetic recording system comprising: the media of claim 16; a slider comprising a near field transducer (NFT), wherein the coupling layer is configured to efficiently couple light energy from the NFT; and a light source coupled to the slider and configured to emit light to the NFT, wherein the NFT is configured to direct the light energy on the media.