Percolative magnetic correlation and competing-antiferromagnetism in highly oriented pyrolytic graphite with hexagonal Moiré superlattices at the magic-angle
Occurrence of magnetic-correlation-phenomena in multi-layered carbon-materials has recently attracted an important attention for applications in magnetic devices and spintronics. In this study, exfoliated highly-oriented-pyrolytic-graphite (HOPG) lamellae exhibiting hexagonal-Moiré-superlattices, wi...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2020-01-01
|
| Series: | Materials Research Express |
| Subjects: | |
| Online Access: | https://doi.org/10.1088/2053-1591/abcdd8 |
| _version_ | 1797746851339829248 |
|---|---|
| author | Filippo S Boi Shuai Gao Yi He Shanling Wang |
| author_facet | Filippo S Boi Shuai Gao Yi He Shanling Wang |
| author_sort | Filippo S Boi |
| collection | DOAJ |
| description | Occurrence of magnetic-correlation-phenomena in multi-layered carbon-materials has recently attracted an important attention for applications in magnetic devices and spintronics. In this study, exfoliated highly-oriented-pyrolytic-graphite (HOPG) lamellae exhibiting hexagonal-Moiré-superlattices, with periodicity of ∼13 nm (1st category, θ _rot ∼ 1.09° ) and ∼36 nm (2nd category, θ _rot ∼ 0.39°) were investigated. Raman-spectroscopy evidenced weak D, D’ and intense G bands. In 1st category, magnetization versus field, ZFC- FC magnetic-curves from 2 K to 300 K and T-ESR revealed presence of uncorrelated and correlated ferromagnetic clusters at T* ∼ 150 K together with a critical transition at T _c ∼ 50 K, compatible with percolative-ferromagnetic-correlation. Comparative measurements on the 2nd category, revealed an analogue trend, with at T* ∼ 50–60 K together with an irreversibility at T _c ∼ 40 K, indicative of competing ferromagnetic/antiferromagnetic-correlations. |
| first_indexed | 2024-03-12T15:42:41Z |
| format | Article |
| id | doaj.art-fe0446826db04c30915d977bdc048517 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:42:41Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-fe0446826db04c30915d977bdc0485172023-08-09T15:54:48ZengIOP PublishingMaterials Research Express2053-15912020-01-0171212560210.1088/2053-1591/abcdd8Percolative magnetic correlation and competing-antiferromagnetism in highly oriented pyrolytic graphite with hexagonal Moiré superlattices at the magic-angleFilippo S Boi0https://orcid.org/0000-0002-1586-5141Shuai Gao1Yi He2Shanling Wang3College of Physics, Condensed Matter Group, Sichuan University , Chengdu, People’s Republic of ChinaCollege of Physics, Condensed Matter Group, Sichuan University , Chengdu, People’s Republic of ChinaAnalytical and Testing Center, Sichuan University , Chengdu, People’s Republic of ChinaAnalytical and Testing Center, Sichuan University , Chengdu, People’s Republic of ChinaOccurrence of magnetic-correlation-phenomena in multi-layered carbon-materials has recently attracted an important attention for applications in magnetic devices and spintronics. In this study, exfoliated highly-oriented-pyrolytic-graphite (HOPG) lamellae exhibiting hexagonal-Moiré-superlattices, with periodicity of ∼13 nm (1st category, θ _rot ∼ 1.09° ) and ∼36 nm (2nd category, θ _rot ∼ 0.39°) were investigated. Raman-spectroscopy evidenced weak D, D’ and intense G bands. In 1st category, magnetization versus field, ZFC- FC magnetic-curves from 2 K to 300 K and T-ESR revealed presence of uncorrelated and correlated ferromagnetic clusters at T* ∼ 150 K together with a critical transition at T _c ∼ 50 K, compatible with percolative-ferromagnetic-correlation. Comparative measurements on the 2nd category, revealed an analogue trend, with at T* ∼ 50–60 K together with an irreversibility at T _c ∼ 40 K, indicative of competing ferromagnetic/antiferromagnetic-correlations.https://doi.org/10.1088/2053-1591/abcdd8pyrolytic graphitemagic anglerotational defectspercolative ferromagnetism |
| spellingShingle | Filippo S Boi Shuai Gao Yi He Shanling Wang Percolative magnetic correlation and competing-antiferromagnetism in highly oriented pyrolytic graphite with hexagonal Moiré superlattices at the magic-angle Materials Research Express pyrolytic graphite magic angle rotational defects percolative ferromagnetism |
| title | Percolative magnetic correlation and competing-antiferromagnetism in highly oriented pyrolytic graphite with hexagonal Moiré superlattices at the magic-angle |
| title_full | Percolative magnetic correlation and competing-antiferromagnetism in highly oriented pyrolytic graphite with hexagonal Moiré superlattices at the magic-angle |
| title_fullStr | Percolative magnetic correlation and competing-antiferromagnetism in highly oriented pyrolytic graphite with hexagonal Moiré superlattices at the magic-angle |
| title_full_unstemmed | Percolative magnetic correlation and competing-antiferromagnetism in highly oriented pyrolytic graphite with hexagonal Moiré superlattices at the magic-angle |
| title_short | Percolative magnetic correlation and competing-antiferromagnetism in highly oriented pyrolytic graphite with hexagonal Moiré superlattices at the magic-angle |
| title_sort | percolative magnetic correlation and competing antiferromagnetism in highly oriented pyrolytic graphite with hexagonal moire superlattices at the magic angle |
| topic | pyrolytic graphite magic angle rotational defects percolative ferromagnetism |
| url | https://doi.org/10.1088/2053-1591/abcdd8 |
| work_keys_str_mv | AT filipposboi percolativemagneticcorrelationandcompetingantiferromagnetisminhighlyorientedpyrolyticgraphitewithhexagonalmoiresuperlatticesatthemagicangle AT shuaigao percolativemagneticcorrelationandcompetingantiferromagnetisminhighlyorientedpyrolyticgraphitewithhexagonalmoiresuperlatticesatthemagicangle AT yihe percolativemagneticcorrelationandcompetingantiferromagnetisminhighlyorientedpyrolyticgraphitewithhexagonalmoiresuperlatticesatthemagicangle AT shanlingwang percolativemagneticcorrelationandcompetingantiferromagnetisminhighlyorientedpyrolyticgraphitewithhexagonalmoiresuperlatticesatthemagicangle |