Exchange coupled CoPt/FePtC media for heat assisted magnetic recording
L10 FePtC granular media are being studied as potential future magnetic recording media and are set to be used in conjunction with heat assisted magnetic recording (HAMR) to enable recording at write fields within the range of current day recording heads. Media structures based on a FePtC storage la...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/82979 http://hdl.handle.net/10220/47548 |
| _version_ | 1811697240235835392 |
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| author | Dutta, Tanmay Piramanayagam, S. N. Ru, Tan Hui Saifullah, M. S. M. Bhatia, C. S. Yang, Hyunsoo |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Dutta, Tanmay Piramanayagam, S. N. Ru, Tan Hui Saifullah, M. S. M. Bhatia, C. S. Yang, Hyunsoo |
| author_sort | Dutta, Tanmay |
| collection | NTU |
| description | L10 FePtC granular media are being studied as potential future magnetic recording media and are set to be used in conjunction with heat assisted magnetic recording (HAMR) to enable recording at write fields within the range of current day recording heads. Media structures based on a FePtC storage layer and a capping layer can alleviate the switching field distribution (SFD) requirements of HAMR and reduce the noise originating from the writing process. However, the current designs suffer from SFD issues due to high temperature writing. To overcome this problem, we study a CoPt/FePtC exchange coupled composite structure, where FePtC serves as the storage layer and CoPt (with higher Curie temperature, Tc) as the capping layer. CoPt remains ferromagnetic at near Tc of FePtC. Consequently, the counter exchange energy from CoPt would reduce the noise resulting from the adjacent grain interactions during the writing process. CoPt/FePtC bilayer samples with different thicknesses of CoPt were investigated. Our studies found that CoPt forms a continuous layer at a thickness of 6 nm and leads to considerable reduction in the saturation field and its distribution. |
| first_indexed | 2024-10-01T07:52:07Z |
| format | Journal Article |
| id | ntu-10356/82979 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:52:07Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/829792023-02-28T19:31:14Z Exchange coupled CoPt/FePtC media for heat assisted magnetic recording Dutta, Tanmay Piramanayagam, S. N. Ru, Tan Hui Saifullah, M. S. M. Bhatia, C. S. Yang, Hyunsoo School of Physical and Mathematical Sciences Exchange Coupling DRNTU::Science::Physics Chemical Elements L10 FePtC granular media are being studied as potential future magnetic recording media and are set to be used in conjunction with heat assisted magnetic recording (HAMR) to enable recording at write fields within the range of current day recording heads. Media structures based on a FePtC storage layer and a capping layer can alleviate the switching field distribution (SFD) requirements of HAMR and reduce the noise originating from the writing process. However, the current designs suffer from SFD issues due to high temperature writing. To overcome this problem, we study a CoPt/FePtC exchange coupled composite structure, where FePtC serves as the storage layer and CoPt (with higher Curie temperature, Tc) as the capping layer. CoPt remains ferromagnetic at near Tc of FePtC. Consequently, the counter exchange energy from CoPt would reduce the noise resulting from the adjacent grain interactions during the writing process. CoPt/FePtC bilayer samples with different thicknesses of CoPt were investigated. Our studies found that CoPt forms a continuous layer at a thickness of 6 nm and leads to considerable reduction in the saturation field and its distribution. ASTAR (Agency for Sci., Tech. and Research, S’pore) Published version 2019-01-23T03:18:11Z 2019-12-06T15:09:27Z 2019-01-23T03:18:11Z 2019-12-06T15:09:27Z 2018 Journal Article Dutta, T., Piramanayagam, S. N., Ru, T. H., Saifullah, M. S. M., Bhatia, C. S., & Yang, H. (2018). Exchange coupled CoPt/FePtC media for heat assisted magnetic recording. Applied Physics Letters, 112(14), 142411-. doi:10.1063/1.5012815 0003-6951 https://hdl.handle.net/10356/82979 http://hdl.handle.net/10220/47548 10.1063/1.5012815 en Applied Physics Letters © 2018 The Author(s). All rights reserved. This paper was published by AIP in Applied Physics Letters and is made available with permission of The Author(s). 5 p. application/pdf |
| spellingShingle | Exchange Coupling DRNTU::Science::Physics Chemical Elements Dutta, Tanmay Piramanayagam, S. N. Ru, Tan Hui Saifullah, M. S. M. Bhatia, C. S. Yang, Hyunsoo Exchange coupled CoPt/FePtC media for heat assisted magnetic recording |
| title | Exchange coupled CoPt/FePtC media for heat assisted magnetic recording |
| title_full | Exchange coupled CoPt/FePtC media for heat assisted magnetic recording |
| title_fullStr | Exchange coupled CoPt/FePtC media for heat assisted magnetic recording |
| title_full_unstemmed | Exchange coupled CoPt/FePtC media for heat assisted magnetic recording |
| title_short | Exchange coupled CoPt/FePtC media for heat assisted magnetic recording |
| title_sort | exchange coupled copt feptc media for heat assisted magnetic recording |
| topic | Exchange Coupling DRNTU::Science::Physics Chemical Elements |
| url | https://hdl.handle.net/10356/82979 http://hdl.handle.net/10220/47548 |
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