Z-Tetraol Reflow in Heat-Assisted Magnetic Recording
Lubricant reflow for Z-Tetraol is characterized for heat-assisted magnetic recording (HAMR). The thickness-dependent diffusion constant, D(h), is determined from flow experiments for submonolayer Z-Tetraol films between 2.5 and 13 Å. Fickian diffusion using experimental D(h) values are us...
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| Format: | Article |
| Language: | English |
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Japanese Society of Tribologists
2016-03-01
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| Series: | Tribology Online |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/trol/11/1/11_50/_pdf/-char/en |
| _version_ | 1818858609985978368 |
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| author | Robert J. Waltman |
| author_facet | Robert J. Waltman |
| author_sort | Robert J. Waltman |
| collection | DOAJ |
| description | Lubricant reflow for Z-Tetraol is characterized for heat-assisted magnetic recording (HAMR). The thickness-dependent diffusion constant, D(h), is determined from flow experiments for submonolayer Z-Tetraol films between 2.5 and 13 Å. Fickian diffusion using experimental D(h) values are used to numerically simulate lubricant reflow into HAMR laser-depleted troughs as a function of trough number, trough depth, trough distance and trough width. Reflow is computed to be slower for multiple, wider and deeper troughs. Reflow kinetics as a function of trough separation distance is complicated by adjacent trough interactions. Two major kinetic regimes are identified. Multiple troughs that have not coalesced recover more quickly. Once multiple troughs coalesce into a single larger trough, reflow kinetics is drastically slowed. The crossover time between the two kinetic regimes is computed to be approximately 400 millisec for the system under investigation here, but will be a strong function of trough number, width, depth and separation distances. The simulation of multiple troughs provides significant insight into HAMR conditions. Single trough lubricant studies may be misleading for HAMR systems. |
| first_indexed | 2024-12-19T08:59:01Z |
| format | Article |
| id | doaj.art-8d4232d1b0a042d4a37ec2574f2866c6 |
| institution | Directory Open Access Journal |
| issn | 1881-2198 |
| language | English |
| last_indexed | 2024-12-19T08:59:01Z |
| publishDate | 2016-03-01 |
| publisher | Japanese Society of Tribologists |
| record_format | Article |
| series | Tribology Online |
| spelling | doaj.art-8d4232d1b0a042d4a37ec2574f2866c62022-12-21T20:28:32ZengJapanese Society of TribologistsTribology Online1881-21982016-03-01111506010.2474/trol.11.50trolZ-Tetraol Reflow in Heat-Assisted Magnetic RecordingRobert J. Waltman0HGST, a Western Digital CompanyLubricant reflow for Z-Tetraol is characterized for heat-assisted magnetic recording (HAMR). The thickness-dependent diffusion constant, D(h), is determined from flow experiments for submonolayer Z-Tetraol films between 2.5 and 13 Å. Fickian diffusion using experimental D(h) values are used to numerically simulate lubricant reflow into HAMR laser-depleted troughs as a function of trough number, trough depth, trough distance and trough width. Reflow is computed to be slower for multiple, wider and deeper troughs. Reflow kinetics as a function of trough separation distance is complicated by adjacent trough interactions. Two major kinetic regimes are identified. Multiple troughs that have not coalesced recover more quickly. Once multiple troughs coalesce into a single larger trough, reflow kinetics is drastically slowed. The crossover time between the two kinetic regimes is computed to be approximately 400 millisec for the system under investigation here, but will be a strong function of trough number, width, depth and separation distances. The simulation of multiple troughs provides significant insight into HAMR conditions. Single trough lubricant studies may be misleading for HAMR systems.https://www.jstage.jst.go.jp/article/trol/11/1/11_50/_pdf/-char/enz-tetraolhard disk drivesheat-assisted magnetic recordingreflowdiffusion |
| spellingShingle | Robert J. Waltman Z-Tetraol Reflow in Heat-Assisted Magnetic Recording Tribology Online z-tetraol hard disk drives heat-assisted magnetic recording reflow diffusion |
| title | Z-Tetraol Reflow in Heat-Assisted Magnetic Recording |
| title_full | Z-Tetraol Reflow in Heat-Assisted Magnetic Recording |
| title_fullStr | Z-Tetraol Reflow in Heat-Assisted Magnetic Recording |
| title_full_unstemmed | Z-Tetraol Reflow in Heat-Assisted Magnetic Recording |
| title_short | Z-Tetraol Reflow in Heat-Assisted Magnetic Recording |
| title_sort | z tetraol reflow in heat assisted magnetic recording |
| topic | z-tetraol hard disk drives heat-assisted magnetic recording reflow diffusion |
| url | https://www.jstage.jst.go.jp/article/trol/11/1/11_50/_pdf/-char/en |
| work_keys_str_mv | AT robertjwaltman ztetraolreflowinheatassistedmagneticrecording |