Observation of uniaxial strain tuned spin cycloid in a freestanding BiFeO3 film

• URL: http://arxiv.org/abs/2210.09548v1
• Date: Tue, 18 Oct 2022 02:49:39 GMT
• Title: Observation of uniaxial strain tuned spin cycloid in a freestanding BiFeO3 film
• Authors: Zhe Ding, Yumeng Sun, Ningchong Zheng, Xingyue Ma, Mengqi Wang, Yipeng Zang, Pei Yu, Pengfei Wang, Ya Wang, Yurong Yang, Yuefeng Nie, Fazhan Shi and Jiangfeng Du
• Abstract summary: Non-collinear spin order in BiFeO$_3$ breaks space inversion symmetry and allows efficient electric-field control of magnetism. Epitaxial strain effects have been intensively studied and exhibit significant modulation of the magnetic order in BiFeO$_3$. Here, we apply emphin situ uniaxial strain to a freestanding BiFeO$_3$ film and use scanning NV microscope to image the nanoscale magnetic order in real-space.
• Score: 12.801309567465951
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Non-collinear spin order that breaks space inversion symmetry and allows efficient electric-field control of magnetism makes BiFeO$_3$ a promising candidate for applications in low-power spintronic devices. Epitaxial strain effects have been intensively studied and exhibit significant modulation of the magnetic order in BiFeO$_3$, but tuning its spin structure with continuously varied uniaxial strain is still lacking up to date. Here, we apply \emph{in situ} uniaxial strain to a freestanding BiFeO$_3$ film and use scanning NV microscope to image the nanoscale magnetic order in real-space. The strain is continuously increased from 0\% to 1.5\% and four images under different strains are acquired during this period. The images show that the spin cycloid tilts by $\sim 12.6^\circ$ when strain approaches 1.5\%. A first principle calculation has been processed to show that the tilting is energetically favorable under such strain. Our \emph{in situ} strain applying method in combination with scanning NV microscope real-space imaging ability paves a new way in studying the coupling between magnetic order and strain in BiFeO$_3$ films.

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