Characterization of the Thermal Time Constants of HAMR Media
Here we describe experimental spin stand measurements as well as simulations of the time constants associated with thermal transients in heat-assisted magnetic recording (HAMR) media. The thermal transients associated with both increasing and decreasing steps in laser power contain at least two time...
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| Veröffentlicht in: | IEEE transactions on magnetics 2022-11, Vol.58 (11), p.1-5 |
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| container_title | IEEE transactions on magnetics |
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| creator | Gilbert, Ian Rea, Chris Guzman, Javier Loven, Jay Benakli, Mourad |
| description | Here we describe experimental spin stand measurements as well as simulations of the time constants associated with thermal transients in heat-assisted magnetic recording (HAMR) media. The thermal transients associated with both increasing and decreasing steps in laser power contain at least two time constants each, one on the order of 1 ns and another on the order of 10 ns. These time constants are associated with the central thermal peak in the media and the diffuse thermal background, respectively. In addition, the measured thermal fall time is longer than the thermal rise time due to the disk's motion relative to the head. Whereas in conventional HAMR a constant laser power is applied during writes, a number of proposed advanced recording schemes use pulsed laser power to improve either recording performance or reliability. The thermal time constants reported here suggest care must be taken when implementing such schemes so that transition locations are not shifted to the detriment of areal density capability. |
| doi_str_mv | 10.1109/TMAG.2022.3205447 |
| format | Article |
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The thermal transients associated with both increasing and decreasing steps in laser power contain at least two time constants each, one on the order of 1 ns and another on the order of 10 ns. These time constants are associated with the central thermal peak in the media and the diffuse thermal background, respectively. In addition, the measured thermal fall time is longer than the thermal rise time due to the disk's motion relative to the head. Whereas in conventional HAMR a constant laser power is applied during writes, a number of proposed advanced recording schemes use pulsed laser power to improve either recording performance or reliability. The thermal time constants reported here suggest care must be taken when implementing such schemes so that transition locations are not shifted to the detriment of areal density capability.</description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/TMAG.2022.3205447</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>New York: IEEE</publisher><subject>Heat-assisted magnetic recording ; Heat-assisted magnetic recording (HAMR) ; Laser modes ; Laser transitions ; Lasers ; Magnetic heads ; Magnetic recording ; Magnetism ; measurement ; Media ; Power lasers ; Pulsed lasers ; spin stand ; Thermal transients ; Thermodynamic properties ; Transient analysis</subject><ispartof>IEEE transactions on magnetics, 2022-11, Vol.58 (11), p.1-5</ispartof><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. 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The thermal transients associated with both increasing and decreasing steps in laser power contain at least two time constants each, one on the order of 1 ns and another on the order of 10 ns. These time constants are associated with the central thermal peak in the media and the diffuse thermal background, respectively. In addition, the measured thermal fall time is longer than the thermal rise time due to the disk's motion relative to the head. Whereas in conventional HAMR a constant laser power is applied during writes, a number of proposed advanced recording schemes use pulsed laser power to improve either recording performance or reliability. The thermal time constants reported here suggest care must be taken when implementing such schemes so that transition locations are not shifted to the detriment of areal density capability.</description><subject>Heat-assisted magnetic recording</subject><subject>Heat-assisted magnetic recording (HAMR)</subject><subject>Laser modes</subject><subject>Laser transitions</subject><subject>Lasers</subject><subject>Magnetic heads</subject><subject>Magnetic recording</subject><subject>Magnetism</subject><subject>measurement</subject><subject>Media</subject><subject>Power lasers</subject><subject>Pulsed lasers</subject><subject>spin stand</subject><subject>Thermal transients</subject><subject>Thermodynamic properties</subject><subject>Transient analysis</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2022</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNo9kE1Lw0AQhhdRsFZ_gHgJeE6d_UwWvJSgVWgRJJ6XzXaWprRJ3d0e9Neb0OJpZpjnnYGHkHsKM0pBP9Wr-WLGgLEZZyCFKC7IhGpBcwClL8kEgJa5Fkpck5sYt8MoJIUJea42NliXMLS_NrV9l_U-SxvM6g2Gvd1ldbvHrOq7mGyX4rh9m68-sxWuW3tLrrzdRbw71yn5en2pq7d8-bF4r-bL3DHNU16ognHKlRoai422tllbjw6k4-UawTfgJFNUNAJYIzhI7lTjmefajxk-JY-nu4fQfx8xJrPtj6EbXhpWsFIqLaUcKHqiXOhjDOjNIbR7G34MBTNKMqMkM0oyZ0lD5uGUaRHxn9dlySiX_A-tiGDz</recordid><startdate>20221101</startdate><enddate>20221101</enddate><creator>Gilbert, Ian</creator><creator>Rea, Chris</creator><creator>Guzman, Javier</creator><creator>Loven, Jay</creator><creator>Benakli, Mourad</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. (IEEE)</general><scope>97E</scope><scope>RIA</scope><scope>RIE</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7SP</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0001-8106-8573</orcidid><orcidid>https://orcid.org/0000-0002-9621-9300</orcidid></search><sort><creationdate>20221101</creationdate><title>Characterization of the Thermal Time Constants of HAMR Media</title><author>Gilbert, Ian ; Rea, Chris ; Guzman, Javier ; Loven, Jay ; Benakli, Mourad</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c293t-767231366767aeb9aabdafec05c38de0fb0c52614b402b43053c6bf2f39f67673</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2022</creationdate><topic>Heat-assisted magnetic recording</topic><topic>Heat-assisted magnetic recording (HAMR)</topic><topic>Laser modes</topic><topic>Laser transitions</topic><topic>Lasers</topic><topic>Magnetic heads</topic><topic>Magnetic recording</topic><topic>Magnetism</topic><topic>measurement</topic><topic>Media</topic><topic>Power lasers</topic><topic>Pulsed lasers</topic><topic>spin stand</topic><topic>Thermal transients</topic><topic>Thermodynamic properties</topic><topic>Transient analysis</topic><toplevel>online_resources</toplevel><creatorcontrib>Gilbert, Ian</creatorcontrib><creatorcontrib>Rea, Chris</creatorcontrib><creatorcontrib>Guzman, Javier</creatorcontrib><creatorcontrib>Loven, Jay</creatorcontrib><creatorcontrib>Benakli, Mourad</creatorcontrib><collection>IEEE All-Society Periodicals Package (ASPP) 2005-present</collection><collection>IEEE All-Society Periodicals Package (ASPP) 1998-Present</collection><collection>IEEE Electronic Library (IEL)</collection><collection>CrossRef</collection><collection>Electronics & Communications Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>METADEX</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>IEEE transactions on magnetics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Gilbert, Ian</au><au>Rea, Chris</au><au>Guzman, Javier</au><au>Loven, Jay</au><au>Benakli, Mourad</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Characterization of the Thermal Time Constants of HAMR Media</atitle><jtitle>IEEE transactions on magnetics</jtitle><stitle>TMAG</stitle><date>2022-11-01</date><risdate>2022</risdate><volume>58</volume><issue>11</issue><spage>1</spage><epage>5</epage><pages>1-5</pages><issn>0018-9464</issn><eissn>1941-0069</eissn><coden>IEMGAQ</coden><abstract>Here we describe experimental spin stand measurements as well as simulations of the time constants associated with thermal transients in heat-assisted magnetic recording (HAMR) media. The thermal transients associated with both increasing and decreasing steps in laser power contain at least two time constants each, one on the order of 1 ns and another on the order of 10 ns. These time constants are associated with the central thermal peak in the media and the diffuse thermal background, respectively. In addition, the measured thermal fall time is longer than the thermal rise time due to the disk's motion relative to the head. Whereas in conventional HAMR a constant laser power is applied during writes, a number of proposed advanced recording schemes use pulsed laser power to improve either recording performance or reliability. The thermal time constants reported here suggest care must be taken when implementing such schemes so that transition locations are not shifted to the detriment of areal density capability.</abstract><cop>New York</cop><pub>IEEE</pub><doi>10.1109/TMAG.2022.3205447</doi><tpages>5</tpages><orcidid>https://orcid.org/0000-0001-8106-8573</orcidid><orcidid>https://orcid.org/0000-0002-9621-9300</orcidid></addata></record> |
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| subjects | Heat-assisted magnetic recording Heat-assisted magnetic recording (HAMR) Laser modes Laser transitions Lasers Magnetic heads Magnetic recording Magnetism measurement Media Power lasers Pulsed lasers spin stand Thermal transients Thermodynamic properties Transient analysis |
| title | Characterization of the Thermal Time Constants of HAMR Media |
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