Detailed analysis of spin-dependent quantum interference effects in magnetic tunnel junctions with Fe quantum wells

P. Sheng; F. Bonell; S. Miwa; T. Nakamura; Y. Shiota; S. Murakami; D. D. Lam; S. Yoshida; Y. Suzuki

doi:10.1063/1.4789438

Detailed analysis of spin-dependent quantum interference effects in magnetic tunnel junctions with Fe quantum wells

P. Sheng, F. Bonell, S. Miwa, T. Nakamura, Y. Shiota, S. Murakami, D. D. Lam, S. Yoshida, Y. Suzuki

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

We investigated spin-dependent quantum interference effects in Cr(001)/wedge Fe(001)/MgO(001)/Fe(001) magnetic tunnel junctions by dI/dV measurements. dI/dV intensities were mapped two-dimensionally as a function of applied voltage and Fe thickness, indicating a clear signature of quantum well (QW) states in the ultrathin Fe (001) electrode. However, resonant positions of QW states were systematically shifted by one monolayer when compared with the first-principles calculation results. X-ray absorption spectroscopy and magnetic circular dichroism measurements were also performed. While Fe oxide presence at Fe/MgO interface was ruled out, Fe/Cr intermixing could not be excluded. Hence, controlling the Fe/Cr interface may affect QW state.

Original language	English
Article number	032406
Journal	Applied Physics Letters
Volume	102
Issue number	3
DOIs	https://doi.org/10.1063/1.4789438
Publication status	Published - 2013 Jan 21
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.4789438

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@article{f22a7e7c05a541c7822782f58db87dde,

title = "Detailed analysis of spin-dependent quantum interference effects in magnetic tunnel junctions with Fe quantum wells",

abstract = "We investigated spin-dependent quantum interference effects in Cr(001)/wedge Fe(001)/MgO(001)/Fe(001) magnetic tunnel junctions by dI/dV measurements. dI/dV intensities were mapped two-dimensionally as a function of applied voltage and Fe thickness, indicating a clear signature of quantum well (QW) states in the ultrathin Fe (001) electrode. However, resonant positions of QW states were systematically shifted by one monolayer when compared with the first-principles calculation results. X-ray absorption spectroscopy and magnetic circular dichroism measurements were also performed. While Fe oxide presence at Fe/MgO interface was ruled out, Fe/Cr intermixing could not be excluded. Hence, controlling the Fe/Cr interface may affect QW state.",

author = "P. Sheng and F. Bonell and S. Miwa and T. Nakamura and Y. Shiota and S. Murakami and Lam, {D. D.} and S. Yoshida and Y. Suzuki",

note = "Funding Information: This work is supported by Grant-in-Aid for Scientific Research (S), MEXT, Japan. P. Sheng and F. Bonell acknowledge the financial support of the G-COE program by MEXT and CREST by JST, respectively. The XAS and XMCD measurements were performed at beamline BL25SU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (Proposal Nos. 2011A1319, 2011B1720, and 2012A1671).",

year = "2013",

month = jan,

day = "21",

doi = "10.1063/1.4789438",

language = "English",

volume = "102",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

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TY - JOUR

T1 - Detailed analysis of spin-dependent quantum interference effects in magnetic tunnel junctions with Fe quantum wells

AU - Sheng, P.

AU - Bonell, F.

AU - Miwa, S.

AU - Nakamura, T.

AU - Shiota, Y.

AU - Murakami, S.

AU - Lam, D. D.

AU - Yoshida, S.

AU - Suzuki, Y.

N1 - Funding Information: This work is supported by Grant-in-Aid for Scientific Research (S), MEXT, Japan. P. Sheng and F. Bonell acknowledge the financial support of the G-COE program by MEXT and CREST by JST, respectively. The XAS and XMCD measurements were performed at beamline BL25SU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (Proposal Nos. 2011A1319, 2011B1720, and 2012A1671).

PY - 2013/1/21

Y1 - 2013/1/21

N2 - We investigated spin-dependent quantum interference effects in Cr(001)/wedge Fe(001)/MgO(001)/Fe(001) magnetic tunnel junctions by dI/dV measurements. dI/dV intensities were mapped two-dimensionally as a function of applied voltage and Fe thickness, indicating a clear signature of quantum well (QW) states in the ultrathin Fe (001) electrode. However, resonant positions of QW states were systematically shifted by one monolayer when compared with the first-principles calculation results. X-ray absorption spectroscopy and magnetic circular dichroism measurements were also performed. While Fe oxide presence at Fe/MgO interface was ruled out, Fe/Cr intermixing could not be excluded. Hence, controlling the Fe/Cr interface may affect QW state.

AB - We investigated spin-dependent quantum interference effects in Cr(001)/wedge Fe(001)/MgO(001)/Fe(001) magnetic tunnel junctions by dI/dV measurements. dI/dV intensities were mapped two-dimensionally as a function of applied voltage and Fe thickness, indicating a clear signature of quantum well (QW) states in the ultrathin Fe (001) electrode. However, resonant positions of QW states were systematically shifted by one monolayer when compared with the first-principles calculation results. X-ray absorption spectroscopy and magnetic circular dichroism measurements were also performed. While Fe oxide presence at Fe/MgO interface was ruled out, Fe/Cr intermixing could not be excluded. Hence, controlling the Fe/Cr interface may affect QW state.

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VL - 102

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 3

M1 - 032406

ER -

Detailed analysis of spin-dependent quantum interference effects in magnetic tunnel junctions with Fe quantum wells

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