Magnetic Decay at Elevated Temperature Relevant to Heat-Assisted Magnetic Recording
This work uses established techniques for quantifying energy barriers to thermal decay of magnetization in magnetic recording media appropriate for heat-assisted magnetic recording (HAMR). These measurements have been made as a function of temperature and examined for reasonableness, self-consistenc...
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| Veröffentlicht in: | IEEE transactions on magnetics 2009-02, Vol.45 (2), p.883-888 |
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| container_title | IEEE transactions on magnetics |
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| creator | Knight, B.R. Bain, J.A. Schlesinger, T.E. |
| description | This work uses established techniques for quantifying energy barriers to thermal decay of magnetization in magnetic recording media appropriate for heat-assisted magnetic recording (HAMR). These measurements have been made as a function of temperature and examined for reasonableness, self-consistency, and their ability to predict adjacent track aging in HAMR. We find that the demagnetizing factors and energy barrier distribution widths derived from these measurements appear unreliable. However, zero-time switching fields (often designated H 0 ) appear to be reliably determined, as are mean energy barriers. We conclude that significant magnetization rotation is the source of this unreliability and it also contributes to larger than expected distributions in H 0 and a larger than expected temperature dependence of H 0 . Decay predictions are surprisingly effective given the limited amount of reliability in barrier width and demagnetizing field, but a model of decay that includes rotation appears to be needed. |
| doi_str_mv | 10.1109/TMAG.2008.2010668 |
| format | Article |
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These measurements have been made as a function of temperature and examined for reasonableness, self-consistency, and their ability to predict adjacent track aging in HAMR. We find that the demagnetizing factors and energy barrier distribution widths derived from these measurements appear unreliable. However, zero-time switching fields (often designated H 0 ) appear to be reliably determined, as are mean energy barriers. We conclude that significant magnetization rotation is the source of this unreliability and it also contributes to larger than expected distributions in H 0 and a larger than expected temperature dependence of H 0 . Decay predictions are surprisingly effective given the limited amount of reliability in barrier width and demagnetizing field, but a model of decay that includes rotation appears to be needed.</description><identifier>ISSN: 0018-9464</identifier><identifier>EISSN: 1941-0069</identifier><identifier>DOI: 10.1109/TMAG.2008.2010668</identifier><identifier>CODEN: IEMGAQ</identifier><language>eng</language><publisher>New York, NY: IEEE</publisher><subject>Aging ; Barriers ; Cross-disciplinary physics: materials science; rheology ; Decay ; Demagnetization ; Demagnetizing ; Energy barrier ; Energy measurement ; Energy use ; Exact sciences and technology ; Hard disks ; Heat-assisted magnetic recording ; heat-assisted magnetic recording (HAMR) ; hybrid recording ; Magnetic field measurement ; Magnetic recording ; Magnetism ; Magnetization ; Materials science ; Mathematical models ; Other topics in materials science ; Physics ; Predictive models ; Switching ; Temperature dependence ; thermal decay</subject><ispartof>IEEE transactions on magnetics, 2009-02, Vol.45 (2), p.883-888</ispartof><rights>2015 INIST-CNRS</rights><rights>Copyright The Institute of Electrical and Electronics Engineers, Inc. (IEEE) 2009</rights><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c385t-7d6f40aa510913e88d4747de3d2795716275b1ef4fc59f66ae7138c67d5861df3</citedby><cites>FETCH-LOGICAL-c385t-7d6f40aa510913e88d4747de3d2795716275b1ef4fc59f66ae7138c67d5861df3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://ieeexplore.ieee.org/document/4782118$$EHTML$$P50$$Gieee$$H</linktohtml><link.rule.ids>309,310,314,776,780,785,786,792,23909,23910,25118,27901,27902,54733</link.rule.ids><linktorsrc>$$Uhttps://ieeexplore.ieee.org/document/4782118$$EView_record_in_IEEE$$FView_record_in_$$GIEEE</linktorsrc><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21658294$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Knight, B.R.</creatorcontrib><creatorcontrib>Bain, J.A.</creatorcontrib><creatorcontrib>Schlesinger, T.E.</creatorcontrib><title>Magnetic Decay at Elevated Temperature Relevant to Heat-Assisted Magnetic Recording</title><title>IEEE transactions on magnetics</title><addtitle>TMAG</addtitle><description>This work uses established techniques for quantifying energy barriers to thermal decay of magnetization in magnetic recording media appropriate for heat-assisted magnetic recording (HAMR). These measurements have been made as a function of temperature and examined for reasonableness, self-consistency, and their ability to predict adjacent track aging in HAMR. We find that the demagnetizing factors and energy barrier distribution widths derived from these measurements appear unreliable. However, zero-time switching fields (often designated H 0 ) appear to be reliably determined, as are mean energy barriers. We conclude that significant magnetization rotation is the source of this unreliability and it also contributes to larger than expected distributions in H 0 and a larger than expected temperature dependence of H 0 . Decay predictions are surprisingly effective given the limited amount of reliability in barrier width and demagnetizing field, but a model of decay that includes rotation appears to be needed.</description><subject>Aging</subject><subject>Barriers</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Decay</subject><subject>Demagnetization</subject><subject>Demagnetizing</subject><subject>Energy barrier</subject><subject>Energy measurement</subject><subject>Energy use</subject><subject>Exact sciences and technology</subject><subject>Hard disks</subject><subject>Heat-assisted magnetic recording</subject><subject>heat-assisted magnetic recording (HAMR)</subject><subject>hybrid recording</subject><subject>Magnetic field measurement</subject><subject>Magnetic recording</subject><subject>Magnetism</subject><subject>Magnetization</subject><subject>Materials science</subject><subject>Mathematical models</subject><subject>Other topics in materials science</subject><subject>Physics</subject><subject>Predictive models</subject><subject>Switching</subject><subject>Temperature dependence</subject><subject>thermal decay</subject><issn>0018-9464</issn><issn>1941-0069</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><sourceid>RIE</sourceid><recordid>eNp9kU1Lw0AQhhdRsFZ_gHgJgnqK7mz281jqRwVF0Hpe1s1EUtKk7m4F_70JLT148DLDzDzzMsNLyCnQawBqbubPk4drRqnuA1Ap9R4ZgeGQUyrNPhlRCjo3XPJDchTjoi-5ADoib8_us8VU--wWvfvJXMruGvx2CctsjssVBpfWAbNXHLptylKXzdClfBJjHQdqJ_CKvgtl3X4ek4PKNRFPtnlM3u_v5tNZ_vTy8DidPOW-0CLlqpQVp871dxgoUOuSK65KLEqmjFAgmRIfgBWvvDCVlA4VFNpLVQotoayKMbna6K5C97XGmOyyjh6bxrXYraPV0mjOBKU9efkvWXDJKFcDeP4HXHTr0PZfWC2kYQUo3kOwgXzoYgxY2VWoly78WKB2cMMObtjBDbt1o9-52Aq76F1TBdf6Ou4WGUihmRm0zzZcjYi7MVeaAejiF8M2kPk</recordid><startdate>20090201</startdate><enddate>20090201</enddate><creator>Knight, B.R.</creator><creator>Bain, J.A.</creator><creator>Schlesinger, T.E.</creator><general>IEEE</general><general>Institute of Electrical and Electronics Engineers</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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| ispartof | IEEE transactions on magnetics, 2009-02, Vol.45 (2), p.883-888 |
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| subjects | Aging Barriers Cross-disciplinary physics: materials science rheology Decay Demagnetization Demagnetizing Energy barrier Energy measurement Energy use Exact sciences and technology Hard disks Heat-assisted magnetic recording heat-assisted magnetic recording (HAMR) hybrid recording Magnetic field measurement Magnetic recording Magnetism Magnetization Materials science Mathematical models Other topics in materials science Physics Predictive models Switching Temperature dependence thermal decay |
| title | Magnetic Decay at Elevated Temperature Relevant to Heat-Assisted Magnetic Recording |
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