Comparison of h-BN and graphene layers as grain boundary materials for granular FePt-$\text{L}1_0$ thin films
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866913324218712064 |
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| author | Varaprasad, B. S. D. Ch. S. Xu, Chengchao Reese, Brandon Laughlin, David E. Jian-Gang Zhu |
| author_facet | Varaprasad, B. S. D. Ch. S. Xu, Chengchao Reese, Brandon Laughlin, David E. Jian-Gang Zhu |
| contents | Granular $\text{L}1_0$-FePt thin films with small columnar grains are essential for heat-assisted magnetic recording media. While hexagonal boron nitride(h-BN) has proven effective for promoting columnar FePt grains, we explored multilayer graphene as an alternative grain boundary material leveraging its structural similarity to h-BN. The FePt granular thin films with carbon-based grain boundary materials(GBMs) were deposited by cosputtering on Si/SiO2 substrates with substrate bias at 650°C. The RF bias and high temperature facilitated formation of interlinked graphene nanoribbons wrapping around FePt grains, yielding 7.5 nm diameter, 8 nm height grains with an order parameter of 0.78 and a perpendicular coercivity of 40 kOe. However, the formation of graphene nanoribbons could not effectively promote columnar structures, likely due to co-existing amorphous carbon in grain boundaries. Optimizing deposition to improve graphene grain boundary quality is necessary to realize this 2D material's potential for achieving desirable microstructures for HAMR media. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_14290 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Comparison of h-BN and graphene layers as grain boundary materials for granular FePt-$\text{L}1_0$ thin films Varaprasad, B. S. D. Ch. S. Xu, Chengchao Reese, Brandon Laughlin, David E. Jian-Gang Zhu Materials Science Applied Physics Granular $\text{L}1_0$-FePt thin films with small columnar grains are essential for heat-assisted magnetic recording media. While hexagonal boron nitride(h-BN) has proven effective for promoting columnar FePt grains, we explored multilayer graphene as an alternative grain boundary material leveraging its structural similarity to h-BN. The FePt granular thin films with carbon-based grain boundary materials(GBMs) were deposited by cosputtering on Si/SiO2 substrates with substrate bias at 650°C. The RF bias and high temperature facilitated formation of interlinked graphene nanoribbons wrapping around FePt grains, yielding 7.5 nm diameter, 8 nm height grains with an order parameter of 0.78 and a perpendicular coercivity of 40 kOe. However, the formation of graphene nanoribbons could not effectively promote columnar structures, likely due to co-existing amorphous carbon in grain boundaries. Optimizing deposition to improve graphene grain boundary quality is necessary to realize this 2D material's potential for achieving desirable microstructures for HAMR media. |
| title | Comparison of h-BN and graphene layers as grain boundary materials for granular FePt-$\text{L}1_0$ thin films |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2404.14290 |