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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21 January 2021
Research Article|
January 15 2021
Magnetic and ferroelectric properties of oxygen octahedron/tetrahedron mixed ultrathin multiferroic layer by oxygen desorption
T. Ichinose
;
T. Ichinose
1
Graduate School of Engineering, Tohoku University
, 6-6-05 Aoba Aramaki, Aoba-ku, Miyagi 980-8579, Japan
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H. Naganuma
H. Naganuma
a)
1
Graduate School of Engineering, Tohoku University
, 6-6-05 Aoba Aramaki, Aoba-ku, Miyagi 980-8579, Japan
2
Center for Innovative Integrated Electronics Systems (CIES), Tohoku University
, 468-1 Aoba Aramaki, Aoba-ku Sendai, Miyagi 980-8572, Japan
3
Center for Spintronics Integrated Systems (CSIS), Tohoku University
, 2-2-1 Katahira, Aoba-ku Sendai, Miyagi 980-8577, Japan
4
Center for Spintronics Research Network (CSRN), Tohoku University
, 2-2-1 Katahira, Aoba-ku Sendai, Miyagi 980-8577, Japan
a)Author to whom correspondence should be addressed: [email protected]. Tel.: +81-22-796-3401
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a)Author to whom correspondence should be addressed: [email protected]. Tel.: +81-22-796-3401
J. Appl. Phys. 129, 034101 (2021)
Article history
Received:
October 08 2020
Accepted:
December 26 2020
Citation
T. Ichinose, H. Naganuma; Magnetic and ferroelectric properties of oxygen octahedron/tetrahedron mixed ultrathin multiferroic layer by oxygen desorption. J. Appl. Phys. 21 January 2021; 129 (3): 034101. https://doi.org/10.1063/5.0032428
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