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Zhang Y, Shen L, Liu M, Li X, Lu X, Lu L, Ma C, You C, Chen A, Huang C, Chen L, Alexe M, Jia CL. Flexible Quasi-Two-Dimensional CoFe 2O 4 Epitaxial Thin Films for Continuous Strain Tuning of Magnetic Properties. ACS NANO 2017; 11:8002-8009. [PMID: 28657728 DOI: 10.1021/acsnano.7b02637] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Epitaxial thin films of CoFe2O4 (CFO) have successfully been transferred from a SrTiO3 substrate onto a flexible polyimide substrate. By bending the flexible polyimide, different levels of uniaxial strain are continuously introduced into the CFO epitaxial thin films. Unlike traditional epitaxial strain induced by substrates, the strain from bending will not suffer from critical thickness limitation, crystalline quality variation, and substrate clamping, and more importantly, it provides a more intrinsic and reliable way to study strain-controlled behaviors in functional oxide systems. It is found that both the saturation magnetization and coercivity of the transferred films can be changed over the bending status and show a high accord with the movement of the curvature bending radius of the polyimide substrate. This reveals that the mechanical strain plays a critical role in tuning the magnetic properties of CFO thin films parallel and perpendicular to the film plane direction.
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Affiliation(s)
| | | | | | - Xin Li
- State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University , Xi'an 710071, China
| | - Xiaoli Lu
- State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology, School of Microelectronics, Xidian University , Xi'an 710071, China
| | | | | | - Caiyin You
- School of Materials Science and Engineering, Xi'an University of Technology , Xi'an 710048, China
| | - Aiping Chen
- Center for Integrated Nanotechnologies (CINT), Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Chuanwei Huang
- Shenzhen Key Laboratory of Special Functional Materials, College of Materials Science and Engineering, Shenzhen University , Nanshan District, Shenzhen 518060, China
| | - Lang Chen
- Department of Physics, South University of Science and Technology , Nanshan District, Shenzhen 518055, China
| | - Marin Alexe
- Department of Physics, University of Warwick , Coventry CV4 7AL, United Kingdom
| | - Chun-Lin Jia
- Ernst Ruska Centre for Microscopy and Spectroscopy with Electrons, Forschungszentrum Jülich , D-52425 Jülich, Germany
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