Advances in strain engineering on oxide heteroepitaxy

Shao, Pao Wen; Chu, Ying Hao

doi:10.1016/j.matt.2021.05.016

Cited by 4 publications

(3 citation statements)

References 11 publications

(11 reference statements)

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“…Thus, these results demonstrate the continuous strain relaxation of KNO thin films by adjusting the film thicknesses, leading to different strain states in the films. Compared with the conventional epitaxial strain imposed by the misfit strain from the underlying substrates, − the continuous strain states achieved by controlling the strain relaxation process through tuning the film thicknesses can overcome the substrate limitation.…”

Section: Resultsmentioning

confidence: 99%

Strain Tuning of Negative Capacitance in Ferroelectric KNbO₃ Thin Films

Luo

Wang

Chen

et al. 2023

ACS Appl. Mater. Interfaces

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Ferroelectrics with negative capacitance effects can amplify the gate voltage in field-effect transistors to achieve low power operation beyond the limits of Boltzmann's Tyranny. The reduction of power consumption depends on the capacitance matching between the ferroelectric layer and gate dielectrics, which can be well controlled by adjusting the negative capacitance effect in ferroelectrics. However, it is a great challenge to experimentally tune the negative capacitance effect. Here, the observation of the tunable negative capacitance effect in ferroelectric KNbO 3 through strain engineering is demonstrated. The magnitude of the voltage reduction and negative slope in polarization-electric field (P−E) curves as the symbol of negative capacitance effects can be controlled by imposing various epitaxial strains. The adjustment of the negative curvature region in the polarization-energy landscape under different strain states is responsible for the tunable negative capacitance. Our work paves the way for fabricating low-power devices and further reducing energy consumption in electronics.

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Section: Resultsmentioning

confidence: 99%

Strain Tuning of Negative Capacitance in Ferroelectric KNbO₃ Thin Films

Luo

Wang

Chen

et al. 2023

ACS Appl. Mater. Interfaces

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“…[12,14,23] In recent years, several progresses on continuously tuning strains of perovskite oxide films have been made. Deng et al reported a method to continuously tune epitaxial strain by varying the thickness of the buffer layer [28][29][30] while freestanding films could be tuned by bending [31] or stretching flexible organic substrates. [32,33] In this work, we adopt molecular beam epitaxy (MBE) to prepare the freestanding BFO film.…”

Section: Introductionmentioning

confidence: 99%

“…Deng et al. reported a method to continuously tune epitaxial strain by varying the thickness of the buffer layer [ 28–30 ] while freestanding films could be tuned by bending [ 31 ] or stretching flexible organic substrates. [ 32,33 ]…”

Section: Introductionmentioning

confidence: 99%

Observation of Uniaxial Strain Tuned Spin Cycloid in a Freestanding BiFeO₃ Film

Ding

Sun

Zheng

et al. 2023

Adv Funct Materials

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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.

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Tailoring of magnetism & electron transport of manganate thin films by controlling the Mn–O–Mn bond angles via strain engineering

Henning,

Gruhl,

Ross

et al. 2024

Sci Rep

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Strain engineering beyond substrate limitation of colossal magnetoresistant thin (La0.6Pr0.4)0.7Ca0.3MnO3 (LPCMO) films on LaAlO3-buffered SrTiO3 (LAO/STO) substrates has been demonstrated using metalorganic aerosol deposition technique. By growing partially relaxed 7–27 nm thick heteroepitaxial LAO buffer layers on STO a perfect lattice matching to the LPCMO has been achieved. As a result, strain-free heteroepitaxial 10–20 nm thick LPCMO/LAO/STO films with bulk-like ferromagnetic metallic ground state were obtained. Without buffer the coherently strained thin LPCMO/STO and LPCMO/LAO films were insulating and weakly magnetic. The reason for the optimized magnetotransport in strain-free LPCMO films was found to be a large octahedral Mn–O–Mn bond angle φOOR ~ 166–168° as compared to the significantly smaller one of φOOR ~ 152–156° determined for the tensile (LPCMO/STO) and compressively (LPCMO/LAO) strained films.

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Advances in strain engineering on oxide heteroepitaxy

Cited by 4 publications

References 11 publications

Strain Tuning of Negative Capacitance in Ferroelectric KNbO₃ Thin Films

Strain Tuning of Negative Capacitance in Ferroelectric KNbO₃ Thin Films

Observation of Uniaxial Strain Tuned Spin Cycloid in a Freestanding BiFeO₃ Film

Tailoring of magnetism & electron transport of manganate thin films by controlling the Mn–O–Mn bond angles via strain engineering

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Advances in strain engineering on oxide heteroepitaxy

Cited by 4 publications

References 11 publications

Strain Tuning of Negative Capacitance in Ferroelectric KNbO3 Thin Films

Strain Tuning of Negative Capacitance in Ferroelectric KNbO3 Thin Films

Observation of Uniaxial Strain Tuned Spin Cycloid in a Freestanding BiFeO3 Film

Tailoring of magnetism & electron transport of manganate thin films by controlling the Mn–O–Mn bond angles via strain engineering

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Strain Tuning of Negative Capacitance in Ferroelectric KNbO₃ Thin Films

Strain Tuning of Negative Capacitance in Ferroelectric KNbO₃ Thin Films

Observation of Uniaxial Strain Tuned Spin Cycloid in a Freestanding BiFeO₃ Film