Enhancement of electric field modulation of coercivity in Pt /Co/Al-O structures by tuning Co surface oxidation

Junichi Shiogai; Tatsuro Ohashi; Tim Yang; Makoto Kohda; Takeshi Seki; Koki Takanashi; Junsaku Nitta

doi:10.1088/0022-3727/49/3/03LT01

Enhancement of electric field modulation of coercivity in Pt /Co/Al-O structures by tuning Co surface oxidation

Junichi Shiogai, Tatsuro Ohashi, Tim Yang, Makoto Kohda, Takeshi Seki, Koki Takanashi, Junsaku Nitta

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

7 Citations (Scopus)

Abstract

The effect of the oxidation of the Co ferromagnetic layer on gate modulation of its coercivity was experimentally investigated in Pt / Co / Al-O heterostructures. The Co surfaces were naturally oxidized by exposing to atmosphere after Co layer growth, and the degree of oxidation was characterized by x-ray photoelectron spectroscopy (XPS). A comparison between XPS and magneto-transport results suggested that a moderate oxidation of the Co interface enhances the electric-field induced coercivity change, indicating the importance of interface engineering for electrical control of magnetization reversal.

Original language	English
Article number	03LT01
Journal	Journal of Physics D: Applied Physics
Volume	49
Issue number	3
DOIs	https://doi.org/10.1088/0022-3727/49/3/03LT01
Publication status	Published - 2015 Dec 2

Keywords

electric field effect
perpendicular magnetic anisotropy
spintronics

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Acoustics and Ultrasonics
Surfaces, Coatings and Films

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10.1088/0022-3727/49/3/03LT01

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Enhancement of electric field modulation of coercivity in Pt /Co/Al-O structures by tuning Co surface oxidation. / Shiogai, Junichi; Ohashi, Tatsuro; Yang, Tim; Kohda, Makoto ; Seki, Takeshi ; Takanashi, Koki ; Nitta, Junsaku.

In: Journal of Physics D: Applied Physics, Vol. 49, No. 3, 03LT01, 02.12.2015.

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

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abstract = "The effect of the oxidation of the Co ferromagnetic layer on gate modulation of its coercivity was experimentally investigated in Pt / Co / Al-O heterostructures. The Co surfaces were naturally oxidized by exposing to atmosphere after Co layer growth, and the degree of oxidation was characterized by x-ray photoelectron spectroscopy (XPS). A comparison between XPS and magneto-transport results suggested that a moderate oxidation of the Co interface enhances the electric-field induced coercivity change, indicating the importance of interface engineering for electrical control of magnetization reversal.",

keywords = "electric field effect, perpendicular magnetic anisotropy, spintronics",

author = "Junichi Shiogai and Tatsuro Ohashi and Tim Yang and Makoto Kohda and Takeshi Seki and Koki Takanashi and Junsaku Nitta",

note = "Funding Information: This work was partly supported by Grants-in-Aid from JSPS 22226001, 24684019, 25220604 and 15H05699, and by ImPACT Program of Council for Science, Technology and Innovation, and NEDO. The authors acknowledge K Saito and T Sugiyama for technical assistances in film deposition using the ion beam sputtering system and H Saito for XPS measurements. Publisher Copyright: {\textcopyright} 2016 IOP Publishing Ltd.",

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AU - Shiogai, Junichi

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AU - Yang, Tim

AU - Kohda, Makoto

AU - Seki, Takeshi

AU - Takanashi, Koki

AU - Nitta, Junsaku

N1 - Funding Information: This work was partly supported by Grants-in-Aid from JSPS 22226001, 24684019, 25220604 and 15H05699, and by ImPACT Program of Council for Science, Technology and Innovation, and NEDO. The authors acknowledge K Saito and T Sugiyama for technical assistances in film deposition using the ion beam sputtering system and H Saito for XPS measurements. Publisher Copyright: © 2016 IOP Publishing Ltd.

PY - 2015/12/2

Y1 - 2015/12/2

N2 - The effect of the oxidation of the Co ferromagnetic layer on gate modulation of its coercivity was experimentally investigated in Pt / Co / Al-O heterostructures. The Co surfaces were naturally oxidized by exposing to atmosphere after Co layer growth, and the degree of oxidation was characterized by x-ray photoelectron spectroscopy (XPS). A comparison between XPS and magneto-transport results suggested that a moderate oxidation of the Co interface enhances the electric-field induced coercivity change, indicating the importance of interface engineering for electrical control of magnetization reversal.

AB - The effect of the oxidation of the Co ferromagnetic layer on gate modulation of its coercivity was experimentally investigated in Pt / Co / Al-O heterostructures. The Co surfaces were naturally oxidized by exposing to atmosphere after Co layer growth, and the degree of oxidation was characterized by x-ray photoelectron spectroscopy (XPS). A comparison between XPS and magneto-transport results suggested that a moderate oxidation of the Co interface enhances the electric-field induced coercivity change, indicating the importance of interface engineering for electrical control of magnetization reversal.

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KW - perpendicular magnetic anisotropy

KW - spintronics

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JF - Journal Physics D: Applied Physics

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Enhancement of electric field modulation of coercivity in Pt /Co/Al-O structures by tuning Co surface oxidation

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Keywords

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