Pt -enhanced anisotropic magnetoresistance in Pt / Fe bilayers

Pt -enhanced anisotropic magnetoresistance in Pt / Fe bilayers

The anisotropic magnetoresistance (AMR) in epitaxial Pt/Fe/MgO(001) bilayers was systematically studied as a function of Pt thickness, and a strong enhancement of AMR by the Pt layer was observed. The enhancement of AMR persists with a 1 nm Au layer inserted between Pt and Fe but disappears with a 1...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Vol. 90; no. 21
Main Authors: Li, J. X., Jia, M. W., Ding, Z., Liang, J. H., Luo, Y. M., Wu, Y. Z.
Format: Journal Article
Language:English
Published: 04-12-2014
Subjects:
Anisotropy
Condensed matter
Conduction band
Decay
Iron
Magnesium oxide
Magnetoresistance
Magnetoresistivity
Platinum
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Summary:The anisotropic magnetoresistance (AMR) in epitaxial Pt/Fe/MgO(001) bilayers was systematically studied as a function of Pt thickness, and a strong enhancement of AMR by the Pt layer was observed. The enhancement of AMR persists with a 1 nm Au layer inserted between Pt and Fe but disappears with a 1 nm MgO inserted layer. Both the spin Hall magnetoresistance theory and induced Pt moments located at the Fe/Pt interface cannot explain the observed AMR enhancement. The enhanced AMR in the Pt/Fe bilayer can be attributed to the Pt magnetic moment in the conduction band induced by the spin-polarized conduction electron, which has a long decay length of 1.7-2.6 nm.
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content type line 23
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.90.214415