Interface resonance in Fe/Pt/MgO multilayer structure with large voltage controlled magnetic anisotropy change

Y. Jibiki; M. Goto; M. Tsujikawa; P. Risius; S. Hasebe; X. Xu; K. Nawaoka; T. Ohkubo; K. Hono; M. Shirai; S. Miwa; Y. Suzuki

doi:10.1063/1.5082254

Interface resonance in Fe/Pt/MgO multilayer structure with large voltage controlled magnetic anisotropy change

Y. Jibiki, M. Goto, M. Tsujikawa, P. Risius, S. Hasebe, X. Xu, K. Nawaoka, T. Ohkubo, K. Hono, M. Shirai, S. Miwa, Y. Suzuki

Information Devices Division

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3 Citations (Scopus)

Abstract

Electric control of magnetism has been a topic of interest for various spintronic applications. It is known that monoatomic Pt layer insertion at the Fe/MgO interface increases voltage-controlled magnetic anisotropy (VCMA). However, the reason for the optimality of this thickness has not been explained thus far. In this study, we observed the changes in the electronic states at the Fe/MgO interface using tunneling spectroscopy on an epitaxial Fe(001)/Pt/MgO(001) structure to characterize the density of states around the Fermi level. We found that a surface resonant state is formed at the Fermi level by the insertion of a monoatomic Pt layer, which is consistent with our first principles study. In addition, the VCMA enhancement owing to the formation of this surface resonance state agrees with the recently proposed microscopic theory.

Original language	English
Article number	082405
Journal	Applied Physics Letters
Volume	114
Issue number	8
DOIs	https://doi.org/10.1063/1.5082254
Publication status	Published - 2019 Feb 25

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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10.1063/1.5082254

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Interface resonance in Fe/Pt/MgO multilayer structure with large voltage controlled magnetic anisotropy change. / Jibiki, Y.; Goto, M.; Tsujikawa, M.; Risius, P.; Hasebe, S.; Xu, X.; Nawaoka, K.; Ohkubo, T.; Hono, K.; Shirai, M.; Miwa, S.; Suzuki, Y.

In: Applied Physics Letters, Vol. 114, No. 8, 082405, 25.02.2019.

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

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title = "Interface resonance in Fe/Pt/MgO multilayer structure with large voltage controlled magnetic anisotropy change",

abstract = "Electric control of magnetism has been a topic of interest for various spintronic applications. It is known that monoatomic Pt layer insertion at the Fe/MgO interface increases voltage-controlled magnetic anisotropy (VCMA). However, the reason for the optimality of this thickness has not been explained thus far. In this study, we observed the changes in the electronic states at the Fe/MgO interface using tunneling spectroscopy on an epitaxial Fe(001)/Pt/MgO(001) structure to characterize the density of states around the Fermi level. We found that a surface resonant state is formed at the Fermi level by the insertion of a monoatomic Pt layer, which is consistent with our first principles study. In addition, the VCMA enhancement owing to the formation of this surface resonance state agrees with the recently proposed microscopic theory.",

author = "Y. Jibiki and M. Goto and M. Tsujikawa and P. Risius and S. Hasebe and X. Xu and K. Nawaoka and T. Ohkubo and K. Hono and M. Shirai and S. Miwa and Y. Suzuki",

note = "Funding Information: We thank Professor E. Tamura of Osaka University for discussion. This work was partially supported by JSPS KAKENHI (Nos. JP26103002 and JP18H03880), the ImPACT program, the Materials Research by Information Integration Initiative (MI2I) project of Japan Science and Technology Agency (JST) affiliated with National Institute for Materials Science, and the Shimadzu Science Foundation. Publisher Copyright: {\textcopyright} 2019 Author(s).",

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AU - Jibiki, Y.

AU - Goto, M.

AU - Tsujikawa, M.

AU - Risius, P.

AU - Hasebe, S.

AU - Xu, X.

AU - Nawaoka, K.

AU - Ohkubo, T.

AU - Hono, K.

AU - Shirai, M.

AU - Miwa, S.

AU - Suzuki, Y.

N1 - Funding Information: We thank Professor E. Tamura of Osaka University for discussion. This work was partially supported by JSPS KAKENHI (Nos. JP26103002 and JP18H03880), the ImPACT program, the Materials Research by Information Integration Initiative (MI2I) project of Japan Science and Technology Agency (JST) affiliated with National Institute for Materials Science, and the Shimadzu Science Foundation. Publisher Copyright: © 2019 Author(s).

PY - 2019/2/25

Y1 - 2019/2/25

N2 - Electric control of magnetism has been a topic of interest for various spintronic applications. It is known that monoatomic Pt layer insertion at the Fe/MgO interface increases voltage-controlled magnetic anisotropy (VCMA). However, the reason for the optimality of this thickness has not been explained thus far. In this study, we observed the changes in the electronic states at the Fe/MgO interface using tunneling spectroscopy on an epitaxial Fe(001)/Pt/MgO(001) structure to characterize the density of states around the Fermi level. We found that a surface resonant state is formed at the Fermi level by the insertion of a monoatomic Pt layer, which is consistent with our first principles study. In addition, the VCMA enhancement owing to the formation of this surface resonance state agrees with the recently proposed microscopic theory.

AB - Electric control of magnetism has been a topic of interest for various spintronic applications. It is known that monoatomic Pt layer insertion at the Fe/MgO interface increases voltage-controlled magnetic anisotropy (VCMA). However, the reason for the optimality of this thickness has not been explained thus far. In this study, we observed the changes in the electronic states at the Fe/MgO interface using tunneling spectroscopy on an epitaxial Fe(001)/Pt/MgO(001) structure to characterize the density of states around the Fermi level. We found that a surface resonant state is formed at the Fermi level by the insertion of a monoatomic Pt layer, which is consistent with our first principles study. In addition, the VCMA enhancement owing to the formation of this surface resonance state agrees with the recently proposed microscopic theory.

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Interface resonance in Fe/Pt/MgO multilayer structure with large voltage controlled magnetic anisotropy change

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