Magnetic and ferroelectric properties of oxygen octahedron/tetrahedron mixed ultrathin multiferroic layer by oxygen desorption

T. Ichinose; H. Naganuma

doi:10.1063/5.0032428

Magnetic and ferroelectric properties of oxygen octahedron/tetrahedron mixed ultrathin multiferroic layer by oxygen desorption

T. Ichinose, H. Naganuma

Center for Innovative Integrated Electronic Systems (CIES)

Tohoku University

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

1 Citation (Scopus)

Abstract

BiFeO3 epitaxial films (tBFO = 1-10 nm) were grown on a LaSrMnO3 (tLSMO = 70 nm) buffer layer and capped with a Ru or Ru/Al layer. The BiFeO3 ultrathin film (tBFO = 3 nm) was confirmed to be continuous and flat over a wide area. Piezoelectric response and switching of spontaneous polarization were observed in the ultrathin films by switching-spectroscopy piezoelectric force microscopy measurements. Using the lock-in method with a modulation frequency of 10 Hz in x-ray absorption spectroscopy (XAS), a difference was observed between the left- and right-circularly polarized XAS signals of Fe L3 and L2 owing to x-ray magnetic circular dichroism (XMCD). The number of Fe L3 and L2 XMCD peaks indicated that a mixture of oxygen octahedron and tetrahedron (divalent and trivalent) structures might be formed. The tBFO dependence of XMCD revealed that approximately 1 nm thick ferro-like magnetic properties emerged on the BiFeO3 side of the BiFeO3/Ru interface. Ru may partially extract oxygen from BiFeO3, forming an oxygen tetrahedron structure. The BiFeO3/Ru bilayer exhibits both a piezoelectric response and ferro-like magnetism, which is promising as the basic structure of multiferroic tunnel junctions.

Original language	English
Article number	034101
Journal	Journal of Applied Physics
Volume	129
Issue number	3
DOIs	https://doi.org/10.1063/5.0032428
Publication status	Published - 2021 Jan 21

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@article{052f3834d2824bbd88575632572ee6af,

title = "Magnetic and ferroelectric properties of oxygen octahedron/tetrahedron mixed ultrathin multiferroic layer by oxygen desorption",

abstract = "BiFeO3 epitaxial films (tBFO = 1-10 nm) were grown on a LaSrMnO3 (tLSMO = 70 nm) buffer layer and capped with a Ru or Ru/Al layer. The BiFeO3 ultrathin film (tBFO = 3 nm) was confirmed to be continuous and flat over a wide area. Piezoelectric response and switching of spontaneous polarization were observed in the ultrathin films by switching-spectroscopy piezoelectric force microscopy measurements. Using the lock-in method with a modulation frequency of 10 Hz in x-ray absorption spectroscopy (XAS), a difference was observed between the left- and right-circularly polarized XAS signals of Fe L3 and L2 owing to x-ray magnetic circular dichroism (XMCD). The number of Fe L3 and L2 XMCD peaks indicated that a mixture of oxygen octahedron and tetrahedron (divalent and trivalent) structures might be formed. The tBFO dependence of XMCD revealed that approximately 1 nm thick ferro-like magnetic properties emerged on the BiFeO3 side of the BiFeO3/Ru interface. Ru may partially extract oxygen from BiFeO3, forming an oxygen tetrahedron structure. The BiFeO3/Ru bilayer exhibits both a piezoelectric response and ferro-like magnetism, which is promising as the basic structure of multiferroic tunnel junctions.",

author = "T. Ichinose and H. Naganuma",

note = "Funding Information: This study was partly supported by KAKENHI (No. 15H03548), Murata Science Foundation (No. 072), and Japan Society for the Promotion of Science (JSPS) Core-to-Core Program (No. JPJSCCA20160005). This study was performed under the approval of the Photon Factory Program Advisory Committee (Proposal Nos. 2015G690 and 2020G577). H.N. appreciates the fruitful discussion with Professor Amemiya from the Institute of Materials Structure Science, High Energy Accelerator Research Organization, photon factory (PF-KEK) about the XMCD spectrum. We appreciate Dr. Ishii from Oxford Instruments (ASYLUM Research) for the PFM measurement. The authors declare no competing financial interest. Publisher Copyright: {\textcopyright} 2021 Author(s).",

year = "2021",

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doi = "10.1063/5.0032428",

language = "English",

volume = "129",

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issn = "0021-8979",

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T1 - Magnetic and ferroelectric properties of oxygen octahedron/tetrahedron mixed ultrathin multiferroic layer by oxygen desorption

AU - Ichinose, T.

AU - Naganuma, H.

N1 - Funding Information: This study was partly supported by KAKENHI (No. 15H03548), Murata Science Foundation (No. 072), and Japan Society for the Promotion of Science (JSPS) Core-to-Core Program (No. JPJSCCA20160005). This study was performed under the approval of the Photon Factory Program Advisory Committee (Proposal Nos. 2015G690 and 2020G577). H.N. appreciates the fruitful discussion with Professor Amemiya from the Institute of Materials Structure Science, High Energy Accelerator Research Organization, photon factory (PF-KEK) about the XMCD spectrum. We appreciate Dr. Ishii from Oxford Instruments (ASYLUM Research) for the PFM measurement. The authors declare no competing financial interest. Publisher Copyright: © 2021 Author(s).

PY - 2021/1/21

Y1 - 2021/1/21

N2 - BiFeO3 epitaxial films (tBFO = 1-10 nm) were grown on a LaSrMnO3 (tLSMO = 70 nm) buffer layer and capped with a Ru or Ru/Al layer. The BiFeO3 ultrathin film (tBFO = 3 nm) was confirmed to be continuous and flat over a wide area. Piezoelectric response and switching of spontaneous polarization were observed in the ultrathin films by switching-spectroscopy piezoelectric force microscopy measurements. Using the lock-in method with a modulation frequency of 10 Hz in x-ray absorption spectroscopy (XAS), a difference was observed between the left- and right-circularly polarized XAS signals of Fe L3 and L2 owing to x-ray magnetic circular dichroism (XMCD). The number of Fe L3 and L2 XMCD peaks indicated that a mixture of oxygen octahedron and tetrahedron (divalent and trivalent) structures might be formed. The tBFO dependence of XMCD revealed that approximately 1 nm thick ferro-like magnetic properties emerged on the BiFeO3 side of the BiFeO3/Ru interface. Ru may partially extract oxygen from BiFeO3, forming an oxygen tetrahedron structure. The BiFeO3/Ru bilayer exhibits both a piezoelectric response and ferro-like magnetism, which is promising as the basic structure of multiferroic tunnel junctions.

AB - BiFeO3 epitaxial films (tBFO = 1-10 nm) were grown on a LaSrMnO3 (tLSMO = 70 nm) buffer layer and capped with a Ru or Ru/Al layer. The BiFeO3 ultrathin film (tBFO = 3 nm) was confirmed to be continuous and flat over a wide area. Piezoelectric response and switching of spontaneous polarization were observed in the ultrathin films by switching-spectroscopy piezoelectric force microscopy measurements. Using the lock-in method with a modulation frequency of 10 Hz in x-ray absorption spectroscopy (XAS), a difference was observed between the left- and right-circularly polarized XAS signals of Fe L3 and L2 owing to x-ray magnetic circular dichroism (XMCD). The number of Fe L3 and L2 XMCD peaks indicated that a mixture of oxygen octahedron and tetrahedron (divalent and trivalent) structures might be formed. The tBFO dependence of XMCD revealed that approximately 1 nm thick ferro-like magnetic properties emerged on the BiFeO3 side of the BiFeO3/Ru interface. Ru may partially extract oxygen from BiFeO3, forming an oxygen tetrahedron structure. The BiFeO3/Ru bilayer exhibits both a piezoelectric response and ferro-like magnetism, which is promising as the basic structure of multiferroic tunnel junctions.

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DO - 10.1063/5.0032428

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VL - 129

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 3

M1 - 034101

ER -

Magnetic and ferroelectric properties of oxygen octahedron/tetrahedron mixed ultrathin multiferroic layer by oxygen desorption

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