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Novel epitaxial growth and magnetotransport characterization of single crystal [formula omitted] superlattices on Mo buffer layers
Single-crystal Co(11 20) Cr(100) superlattices (SLs) have been successfully grown on MgO (100) and Al 2O 3 (1 1 02) substrates with 100 Å Mo as buffer layers by molecular beam epitaxy (MBE). Excellent epitaxial growth was evidenced by reflection high-energy electron diffraction (RHEED). Magneto-resi...
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Published in: | Applied surface science 1996-02, Vol.92, p.480-483 |
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Main Authors: | , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Single-crystal
Co(11
20)
Cr(100)
superlattices (SLs) have been successfully grown on MgO (100) and Al
2O
3 (1
1
02) substrates with 100 Å Mo as buffer layers by molecular beam epitaxy (MBE). Excellent epitaxial growth was evidenced by reflection high-energy electron diffraction (RHEED). Magneto-resistance (MR) measurements have been performed using a conventional four-point technique. We have observed negative MR (NMR ≈ 4.8%) for
[
Co(40
A
̊
)
Cr(5
A
̊
)
]
70
SLs, giant positive MR (PMR ≈ 30%) for
[
Co(5
Co)
Cr(5
A
̊
)
]
100
SLs. It is likely that the NMR effect is introduced by the
Co
Cr
SL while PMR is induced by the Mo buffer layers. Interestingly, PMR samples show a distinct roughness effect compared to NMR samples. Systematically we have found that NMR increases with increasing interfacial roughness, while PMR samples show the opposite behavior. |
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ISSN: | 0169-4332 1873-5584 |
DOI: | 10.1016/0169-4332(95)00281-2 |