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Theory of tunneling magnetoresistance of an epitaxial Fe/MgO/Fe(001) junction
Abstract
Calculation of the tunneling magnetoresistance (TMR) of an epitaxial Fe/MgO/Fe(001) junction is reported. The conductances of the junction in its ferromagnetic and antiferromagnetic configurations are determined without any approximations from the real-space Kubo formula using tight-binding bands fitted to an ab initio band structure of iron and MgO. The calculated optimistic TMR ratio is in excess of 1000% for an MgO barrier of $\ensuremath{\approx}20$ atomic planes and the spin polarization of the tunneling current is positive for all MgO thicknesses. It is also found that spin-dependent tunneling in an Fe/MgO/Fe(001) junction is not entirely determined by states at the $\ensuremath{\Gamma}$ point $({\mathbf{k}}_{\ensuremath{\Vert}}=0)$ even for MgO thicknesses as large as $\ensuremath{\approx}20$ atomic planes. All these results are explained qualitatively in terms of the Fe majority- and minority-spin surface spectral densities and the complex MgO Fermi surface.
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Cites
Large Magnetoresistance at Room Temperature in Ferromagnetic Thin Film Tunnel Junctions
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Handbook of the Band Structure of Elemental Solids: From Z = 1 To Z = 112
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Direct calculation of the tunneling current
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Observation of low-lying resonance states ofHe−at the21S and23S He thresholds
Báder, A., Sarkadi, L., Víkor, L., Kuzel, M., Závodszky, P. A., Jalowy, T., Groeneveld, K. O., Macri, P. A., & Barrachina, R. O. (1997) · Physical Review A · doi:10.1103/physreva.55.r14 · Cited by 356
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Cited by
Giant room-temperature magnetoresistance in single-crystal Fe/MgO/Fe magnetic tunnel junctions
Yuasa, S., Nagahama, T., Fukushima, A., Suzuki, Y., & Ando, K. (2004) · Nature Materials · doi:10.1038/nmat1257 · Cited by 3,331
Giant tunnelling magnetoresistance at room temperature with MgO (100) tunnel barriers
Parkin, S. S. P., Kaiser, C., Panchula, A., Rice, P. M., Hughes, B., Samant, M., & Yang, S.-H. (2004) · Nature Materials · doi:10.1038/nmat1256 · Cited by 3,320
Magnetic sensors and their applications
Lenz, J., & Edelstein, S. (2006) · IEEE Sensors Journal · doi:10.1109/jsen.2006.874493 · Cited by 1,312
Bader, S. D., & Parkin, S. S. P. (2010) · Annual Review of Condensed Matter Physics · doi:10.1146/annurev-conmatphys-070909-104123 · Cited by 700
Yang, H. X., Chshiev, M., Dieny, B., Lee, J. H., Manchon, A., & Shin, K. H. (2011) · Physical Review B · doi:10.1103/physrevb.84.054401 · Cited by 657
Metadata
- Authors
- Mathon, J., & Umerski, A.
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2001-05-10
- Volume
- 63
- Issue
- 22
- ISSN
- 0163-1829 (ISSN-L)
- 1095-3795
- OpenAlex
- W1996731722
- Cited by
- 1,302
- References
- 6
- FWCI
- 11.79
- Type
- journal article
- Language
- en
- Open access
- closed
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