Heterogeneous Integration of Freestanding Bilayer Oxide Membrane for Multiferroicity

Kyeong Tae Kang; Zachary J Corey; Jaejin Hwang; Yogesh Sharma; Binod Paudel; Pinku Roy; Liam Collins; Xueijing Wang; Joon Woo Lee; Yoon Seok Oh; Yeonhoo Kim; Jinkyoung Yoo; Jaekwang Lee; Han Htoon; Quanxi Jia; Aiping Chen

doi:10.1002/advs.202207481

Heterogeneous Integration of Freestanding Bilayer Oxide Membrane for Multiferroicity

Adv Sci (Weinh). 2023 May;10(15):e2207481. doi: 10.1002/advs.202207481. Epub 2023 Apr 3.

Authors

Kyeong Tae Kang^{1

2}, Zachary J Corey^{1

3}, Jaejin Hwang⁴, Yogesh Sharma¹, Binod Paudel¹, Pinku Roy^{1

3}, Liam Collins⁵, Xueijing Wang¹, Joon Woo Lee⁶, Yoon Seok Oh⁶, Yeonhoo Kim^{1

7}, Jinkyoung Yoo¹, Jaekwang Lee⁴, Han Htoon¹, Quanxi Jia³, Aiping Chen¹

Affiliations

¹ Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA.
² Department of Physics, Kyungpook National University, Daegu, 41566, South Korea.
³ Department of Materials Design and Innovation, University of Buffalo - The State University of New York, Buffalo, NY, 14260, USA.
⁴ Department of Physics, Pusan National University, Busan, 46241, South Korea.
⁵ Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA.
⁶ Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea.
⁷ Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science (KRISS), Daejeon, 34133, South Korea.

Abstract

Transition metal oxides exhibit a plethora of electrical and magnetic properties described by their order parameters. In particular, ferroic orderings offer access to a rich spectrum of fundamental physics phenomena, in addition to a range of technological applications. The heterogeneous integration of ferroelectric and ferromagnetic materials is a fruitful way to design multiferroic oxides. The realization of freestanding heterogeneous membranes of multiferroic oxides is highly desirable. In this study, epitaxial BaTiO₃ /La_0.7 Sr_0.3 MnO₃ freestanding bilayer membranes are fabricated using pulsed laser epitaxy. The membrane displays ferroelectricity and ferromagnetism above room temperature accompanying the finite magnetoelectric coupling constant. This study reveals that a freestanding heterostructure can be used to manipulate the structural and emergent properties of the membrane. In the absence of the strain caused by the substrate, the change in orbital occupancy of the magnetic layer leads to the reorientation of the magnetic easy-axis, that is, perpendicular magnetic anisotropy. These results of designing multiferroic oxide membranes open new avenues to integrate such flexible membranes for electronic applications.

Keywords: freestanding oxide membranes; magnetic anisotropy reorientation; magnetoelectric coupling; multiferroics.

Abstract

Grants and funding