Topology optimization of a heat-assisted magnetic recording write head to reduce transition curvature using a binary optimization algorithm utilizing the adjoint method
Abstract In this work, the possibility to reduce transition curvature in heat-assisted magnetic recording, using a conventional write head design, by shaping the recording field to counteract the circular profile of the heat pulse is investigated. Topology optimization of the head tip is performed i...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2022-08-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-18112-z |
| _version_ | 1828255723058888704 |
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| author | Gregor Wautischer Claas Abert Florian Bruckner Florian Slanovc Dieter Suess |
| author_facet | Gregor Wautischer Claas Abert Florian Bruckner Florian Slanovc Dieter Suess |
| author_sort | Gregor Wautischer |
| collection | DOAJ |
| description | Abstract In this work, the possibility to reduce transition curvature in heat-assisted magnetic recording, using a conventional write head design, by shaping the recording field to counteract the circular profile of the heat pulse is investigated. Topology optimization of the head tip is performed in order to create the desired cross-track field profile for increasing distances from the write head tip. For the topology optimization, the adjoint method is utilized to calculate the necessary gradients and a binary optimization scheme is proposed. The optimizations are performed considering linearized material parameters reducing the computational complexity and the results are compared to optimizations incorporating the full non-linear material behavior. The optimized field profiles are evaluated for their influence on the read-back process. To do so, switching probability phase diagrams are calculated and the curvature parameter, the signal to noise ratio and the channel bit density are extracted. The presented results show that while transition curvature can be reduced by shaping the cross-track profile of the write field, this alone does not consequently lead to an improvement of the read back process. Therefore, completely new head designs, considering additional parameters have to be investigated. |
| first_indexed | 2024-04-13T02:18:12Z |
| format | Article |
| id | doaj.art-7db831c81bb64d03911b16dc5a69341e |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-13T02:18:12Z |
| publishDate | 2022-08-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-7db831c81bb64d03911b16dc5a69341e2022-12-22T03:07:04ZengNature PortfolioScientific Reports2045-23222022-08-0112111110.1038/s41598-022-18112-zTopology optimization of a heat-assisted magnetic recording write head to reduce transition curvature using a binary optimization algorithm utilizing the adjoint methodGregor Wautischer0Claas Abert1Florian Bruckner2Florian Slanovc3Dieter Suess4Faculty of Physics, University of ViennaFaculty of Physics, University of ViennaFaculty of Physics, University of ViennaFaculty of Physics, University of ViennaFaculty of Physics, University of ViennaAbstract In this work, the possibility to reduce transition curvature in heat-assisted magnetic recording, using a conventional write head design, by shaping the recording field to counteract the circular profile of the heat pulse is investigated. Topology optimization of the head tip is performed in order to create the desired cross-track field profile for increasing distances from the write head tip. For the topology optimization, the adjoint method is utilized to calculate the necessary gradients and a binary optimization scheme is proposed. The optimizations are performed considering linearized material parameters reducing the computational complexity and the results are compared to optimizations incorporating the full non-linear material behavior. The optimized field profiles are evaluated for their influence on the read-back process. To do so, switching probability phase diagrams are calculated and the curvature parameter, the signal to noise ratio and the channel bit density are extracted. The presented results show that while transition curvature can be reduced by shaping the cross-track profile of the write field, this alone does not consequently lead to an improvement of the read back process. Therefore, completely new head designs, considering additional parameters have to be investigated.https://doi.org/10.1038/s41598-022-18112-z |
| spellingShingle | Gregor Wautischer Claas Abert Florian Bruckner Florian Slanovc Dieter Suess Topology optimization of a heat-assisted magnetic recording write head to reduce transition curvature using a binary optimization algorithm utilizing the adjoint method Scientific Reports |
| title | Topology optimization of a heat-assisted magnetic recording write head to reduce transition curvature using a binary optimization algorithm utilizing the adjoint method |
| title_full | Topology optimization of a heat-assisted magnetic recording write head to reduce transition curvature using a binary optimization algorithm utilizing the adjoint method |
| title_fullStr | Topology optimization of a heat-assisted magnetic recording write head to reduce transition curvature using a binary optimization algorithm utilizing the adjoint method |
| title_full_unstemmed | Topology optimization of a heat-assisted magnetic recording write head to reduce transition curvature using a binary optimization algorithm utilizing the adjoint method |
| title_short | Topology optimization of a heat-assisted magnetic recording write head to reduce transition curvature using a binary optimization algorithm utilizing the adjoint method |
| title_sort | topology optimization of a heat assisted magnetic recording write head to reduce transition curvature using a binary optimization algorithm utilizing the adjoint method |
| url | https://doi.org/10.1038/s41598-022-18112-z |
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