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Observation of Uniaxial Strain Tuned Spin Cycloid in a Freestanding BiFeO3 Film
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-04-28 , DOI: 10.1002/adfm.202213725
Zhe Ding 1 , Yumeng Sun 1 , Ningchong Zheng 2 , Xingyue Ma 2 , Mengqi Wang 1 , Yipeng Zang 2 , Pei Yu 1 , Zhousheng Chen 1 , Pengfei Wang 1 , Ya Wang 1 , Yurong Yang 2 , Yuefeng Nie 2 , Fazhan Shi 1, 3 , Jiangfeng Du 1
Affiliation  

Bismuth ferrite (BiFeO3) possesses a non-collinear spin order while the ferroelectric order breaks space inversion symmetry. This allows efficient electric-field control of magnetism and makes it 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 bismuthBiFeO3, but tuning its spin structure with continuously varied uniaxial strain is still lacking at this moment. Herein, in situ uniaxial tensile strain is applied to a freestanding BiFeO3 film by mechanically stretching an organic substrate. A scanning nitrogen-vacancy (NV) microscopy is applied 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 ≈12.6° when strain approaches 1.5%. A first principle calculation is processed to show that the tilting is energetically favorable under such strain. The 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 BiFeO3 films.

中文翻译:

独立 BiFeO3 薄膜中单轴应变调谐自旋摆线的观察

铁酸铋(BiFeO 3)具有非共线的自旋序,而铁电序打破了空间反演对称性。这允许对磁性进行有效的电场控制,并使其成为低功耗自旋电子器件应用的有希望的候选者。外延应变效应已被深入研究,并表现出对铋BiFeO 3磁序的显着调制,但目前仍缺乏通过连续变化的单轴应变来调节其自旋结构。在此,将原位单轴拉伸应变施加到独立式 BiFeO 3通过机械拉伸有机基材来形成薄膜。应用扫描氮空位(NV)显微镜对真实空间中的纳米级磁序进行成像。应变从0%连续增加到1.5%,在此期间获得不同应变下的四张图像。图像显示,当应变接近 1.5% 时,自旋摆线倾斜约 12.6°。经过第一原理计算后表明,在这种应变下,倾斜在能量上是有利的。原位应变施加方法结合扫描NV显微镜实空间成像能力,为研究BiFeO 3薄膜中磁序与应变的耦合开辟了新途径。
更新日期:2023-04-28
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