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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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Bibliographic Details
Published in:Applied surface science 1996-02, Vol.92, p.480-483
Main Authors: Huang, J.C.A., Yao, Y.D., Liou, Y., Lee, S.F., Yang, W.T., Chang, C.P., Liao, S.Y., Lee, C.H.
Format: Article
Language:English
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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.
ISSN:0169-4332
1873-5584
DOI:10.1016/0169-4332(95)00281-2