Flexible Quasi-Two-Dimensional CoFe<sub>2</sub>O<sub>4</sub> Epitaxial Thin Films for Continuous Strain Tuning of Magnetic Properties

Zhang, Yong; Shen, Lvkang; Liu, Ming; Li, Xin; Lü, Xiaoli; Lu, Lu; Ma, Chunrui; Chen, You; Chen, Aiping; Huang, Chuanwei; Chen, Lang; Alexe, Marin; Jia, Chun‐Lin

doi:10.1021/acsnano.7b02637

Cited by 122 publications

(92 citation statements)

References 46 publications

(43 reference statements)

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“…In addition, the strain in films with different orientations is different, following the trend of σ (111) > σ (110) > σ (001) , which also contributes to the larger ME coupling in (001) nanocomposite films. Recently, flexible substrates have been used to grow functional oxide thin films via Van der Waals epitaxy or transfer . Chu and co‐workers reported the growth of BFO:CFO VANs on a flexible muscovite via van der Waals epitaxy .…”

Section: Functionality Tuning Driven By Strain Defect and Interfacementioning

confidence: 99%

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

et al. 2018

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Complex metal oxides, which show a variety of functional properties such as ferromagnetism, ferroelectricity, multi-ferroelectricity, superconductivity, and ionic conduction, have attracted much attention in the past decades. These exotic physical properties arise from a complex hierarchy of competing interactions among spin, charge, orbital, and lattice degrees of freedom. The development of advanced characterization techniques such as electron microscopy, neutron scattering, synchrotron scattering and imaging, spectroscopy at high magnetic fields, and others has enabled us to study the interactions among these degrees of freedom coupled with strain, defect, and interface Vertically aligned nanocomposite thin films with ordered two phases, grown epitaxially on substrates, have attracted tremendous interest in the past decade. These unique nanostructured composite thin films with large vertical interfacial area, controllable vertical lattice strain, and defects provide an intriguing playground, allowing for the manipulation of a variety of functional properties of the materials via the interplay among strain, defect, and interface. This field has evolved from basic growth and characterization to functionality tuning as well as potential applications in energy conversion and information technology. Here, the remarkable progress achieved in vertically aligned nanocomposite thin films from a perspective of tuning functionalities through control of strain, defect, and interface is summarized. Thin FilmsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.201803241. 12 11 12where c 11 and c 12 are elastic moduli of the film material. Epitaxial strain gradually changes with film thickness in perovskite manganites. Figure 3 shows reciprocal space mapping or RSM (103) of La 0.7 Ca 0.3 MnO 3 (LCMO) films on STO (001) substrates. It captures the gradual strain relaxation process with increasing film thickness in manganite thin films. When the film is very thin, the interface is coherent with

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Section: Functionality Tuning Driven By Strain Defect and Interfacementioning

confidence: 99%

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

et al. 2018

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“…Hence, flexible epitaxial thin film is an essential component of wearable sensors . Recently, some flexible ferromagnetism, ferroelectricity, conductivity, and ME coupling epitaxial thin films have been successfully obtained by using flexible substrate (Mica) or transfer method (peel epitaxial thin films from their hard substrates), such as ITO/Mica, Fe 3 O 4 /Mica, BiFeO 3 ‐CoFe 2 O 4 /Mica, PZT/Mica, BaTi 0.95 Co 0.05 O 3 /Mica, LiFe 5 O 8 , and CoFe 2 O 4 etc . However, the flexible microwave magnetism epitaxial thin films are still scarce up to now.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Strain‐Tunable Microwave Magnetism in Flexible CuFe₂O₄ Epitaxial Thin Film for Wearable Sensors

Liu

et al. 2018

Adv Funct Materials

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Purely mechanical strain-tunable microwave magnetism device with lightweight, flexible, and wearable is crucial for passive sensing systems and spintronic devices (noncontact), such as flexible microwave detectors, flexible microwave signal processing devices, and wearable mechanics-magnetic sensors. Here, a flexible microwave magnetic CuFe 2 O 4 (CuFO) epitaxial thin film with tunable ferromagnetic resonance (FMR) spectra is demonstrated by purely mechanical strains, including tensile and compressive strains, on flexible fluorophlogopite (Mica) substrates. Tensile and compressive strains show remarkable tuning effects of up-regulation and down-regulation on in-plane FMR resonance field (H r ), which can be used for flexible tunable resonators and filters. The out-of-plane FMR spectra can also be tuned by mechanical bending, including H r and absorption peak. The change of out-of-plane FMR spectra has great potential for flexible mechanics-magnetic deformation sensors. Furthermore, a superior microwave magnetic stability and mechanical antifatigue character are obtained in the CuFO/Mica thin films. These flexible epitaxial CuFO thin films with tunable microwave magnetism and excellent mechanical durability are promising for the applications in flexible spintronics, microwave detectors, and oscillators.

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“…Recently, a solution-removable layer has been used as a sacrificial layer between film and substrate. [13][14][15] After the heteroepitaxial growth, this layer is removed by being soaked in a solution, leaving a freestanding film in the solution. Then, the free-standing samples can be transferred to any suitable substrates.…”

Section: Introductionmentioning

confidence: 99%

Van der Waals oxide heteroepitaxy

Chu

2017

npj Quant Mater

141

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The research field of oxide heteroepitaxy suffers from the characteristics of misfit strain and substrate clamping, hampering the optimization of performance and the gain of fundamental understanding of oxide systems. Recently, there are demonstrations on functional oxides epitaxially fabricated on layered muscovite substrate. In these heterostructures, due to the weak interaction between substrate and film, they show the lattice of films close to bulk with excellent strictive properties, suggesting that these critical problems can be potentially solved by van der Waals oxide heteroepitaxy. In addition, by exploiting the transparent and flexible features of muscovite, such a heteroepitaxy can deliver new material solutions to transparent soft technology. In this paper, the history, development, and current status of van der Waals oxide heteroepitaxy are addressed and discussed. In the end, new research directions in terms of fundamental study and practical application are proposed to highlight the importance of this research field.

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Flexible Quasi-Two-Dimensional CoFe₂O₄ Epitaxial Thin Films for Continuous Strain Tuning of Magnetic Properties

Cited by 122 publications

References 46 publications

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

Mechanical Strain‐Tunable Microwave Magnetism in Flexible CuFe₂O₄ Epitaxial Thin Film for Wearable Sensors

Van der Waals oxide heteroepitaxy

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Flexible Quasi-Two-Dimensional CoFe2O4 Epitaxial Thin Films for Continuous Strain Tuning of Magnetic Properties

Cited by 122 publications

References 46 publications

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

Metal Oxide Nanocomposites: A Perspective from Strain, Defect, and Interface

Mechanical Strain‐Tunable Microwave Magnetism in Flexible CuFe2O4 Epitaxial Thin Film for Wearable Sensors

Van der Waals oxide heteroepitaxy

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Product

Resources

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Flexible Quasi-Two-Dimensional CoFe₂O₄ Epitaxial Thin Films for Continuous Strain Tuning of Magnetic Properties

Mechanical Strain‐Tunable Microwave Magnetism in Flexible CuFe₂O₄ Epitaxial Thin Film for Wearable Sensors