Enhanced bending-tuned magnetic properties in epitaxial cobalt ferrite nanopillar arrays on flexible substrates

Shen, Lvkang; Liu, Ming; Ma, Chunrui; Lu, Lu; Fu, Huarui; Chen, You; Lü, Xiaoli; Jia, Chun‐Lin

doi:10.1039/c7mh00939a

Cited by 34 publications

(25 citation statements)

References 44 publications

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“…Hence, we consider fabricating LFO nanopillar arrays (NP‐LFO) on flexible F‐Mica substrates. As shown in Figure a,b, the NP‐LFO produced by chemical etching method shows excellent morphology (see Experimental Section in the Supporting Information) . The crystalline structure of NP‐LFO is ensured by the XRD results in Figure S11 in the Supporting Information, which also shows the (111) OOP orientation and IP multi‐domain structure.…”

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confidence: 83%

“…However, the knowledge of the bending coupled dynamic magnetic properties is still poor when integrating materials in flexible devices. Specifically, magnetocrystalline anisotropy, demagnetization field, and magnetostriction are often considered to play the key role in the coupling between bending and dynamic magnetism, but there is still lack of quantitative analysis for the specific contribution from the three factors …”

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confidence: 99%

“…Besides, the influence from the demagnetization field can be discussed by tuning the nanostructure of the LFO film, since it was reported that nanostructure could effectively modulate the demagnetization factor of materials . In the former work, (111)‐oriented CoFe 2 O 4 nanopillar arrays have been successfully grown on flexible fluorophlogopite substrates by the physical deposition and wet etching process, which can be further extended to form the LFO nanostructures …”

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confidence: 99%

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A Strategy to Modulate the Bending Coupled Microwave Magnetism in Nanoscale Epitaxial Lithium Ferrite for Flexible Spintronic Devices

Shen

Lan

et al. 2018

Advanced Science

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With the development of flexible electronics, the mechanical flexibility of functional materials is becoming one of the most important factors that needs to be considered in materials selection. Recently, flexible epitaxial nanoscale magnetic materials have attracted increasing attention for flexible spintronics. However, the knowledge of the bending coupled dynamic magnetic properties is poor when integrating the materials in flexible devices, which calls for further quantitative analysis. Herein, a series of epitaxial LiFe5O8 (LFO) nanostructures are produced as research models, whose dynamic magnetic properties are characterized by ferromagnetic resonance (FMR) measurements. LFO films with different crystalline orientations are discussed to determine the influence from magnetocrystalline anisotropy. Moreover, LFO nanopillar arrays are grown on flexible substrates to reveal the contribution from the nanoscale morphology. It reveals that the bending tunability of the FMR spectra highly depends on the demagnetization field energy of the sample, which is decided by the magnetism and the shape factor in the nanostructure. Following this result, LFO film with high bending tunability of microwave magnetic properties, and LFO nanopillar arrays with stable properties under bending are obtained. This work shows guiding significances for the design of future flexible tunable/stable microwave magnetic devices.

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confidence: 83%

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confidence: 99%

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confidence: 99%

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A Strategy to Modulate the Bending Coupled Microwave Magnetism in Nanoscale Epitaxial Lithium Ferrite for Flexible Spintronic Devices

Shen

Lan

et al. 2018

Advanced Science

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“…We can clearly see from this figure the effects of both the substrate mechanical properties and the aspect ratio on the strain distribution in the nanodots and their very close neighborhood in the substrate. These results are consistent with recent experimental results . Moreover they look similar to other in‐plane geometries like cylinders.…”

Section: Strains Transmission Factors αXx and αYy For The Different Smentioning

confidence: 99%

Local Stiffness Effect on Ferromagnetic Response of Nanostructure Arrays in Stretchable Systems

Challab

Zighem

Faurie

et al. 2018

Physica Rapid Research Ltrs

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The control of magnetoelastic effects in magnetic media, their improvement or even their minimization according to the intended applications is a current problem. In this work, the effect of the elastic strain on the magnetic properties of Ni60Fe40 continuous films and nanowires deposited on Kapton® substrates has been investigated. For this purpose, piezoactuation mechanical tests are performed in situ with ferromagnetic resonance measurements. It has been observed that the continuous thin film and the array of nanowires exhibit distinct behaviors in the presence of an elastic strain field. Precisely, the induced magnetoelastic anisotropy is much less pronounced in the case of nanowires. This difference in behavior has been explained/investigated based on finite element simulations. These latter revealed that the average strain transmitted from flexible substrate to magnetic medium is less important in the case of nanowires compared to continuous film. This lack of strain transfer/transmission is related to the relative amount of free surface of the nanostructures combined with a strong mechanical contrast between Ni60Fe40 and Kapton (viz., a deposit relatively much more stiffer than the substrate). This important effect can be exploited in the future by controlling and optimizing geometries of nanostructures.

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“…Very recently, intensive research has been devoted to such epitaxial growth of functional perovskite and spinel oxides films on mica for flexible devices . For perovskite SrRuO 3 film system, the crystallographic orientation relationship between films and mica substrate was determined as {111} films || (001) mica and 〈01

\overset{true¯}{1}

〉 films || [010] mica by X‐ray diffraction (XRD) .…”

Section: Introductionmentioning

confidence: 99%

Atomic Scale Understanding of the Epitaxy of Perovskite Oxides on Flexible Mica Substrate

Dai

et al. 2019

Adv Materials Inter

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The excellent functionalities of perovskite oxides and the growing demands for flexible devices lead to great interests on epitaxial growth of functional oxide films on flexible mica substrates. Understanding the film epitaxy on the substrate with a very different crystal structure is a key issue for the optimization of the film growth and hence properties. Such understanding largely depends on knowing the atomic structure of the interfaces between the films and the substrates. Here, the interface between the epitaxial films of SrTiO3 on the fluorophlogopite mica substrate is studied in detail. Two types of interfaces, clean or with secondary phase, exist in this system, leading to two types of crystallographic orientation relationships. Atomic‐resolution scanning transmission electron microscopy images reveal that at the clean interface the (111) Sr–O3 atomic plane of SrTiO3 interacts with the (001) (SiAl)2–O3 plane of mica. This interface structure and thus the epitaxy of the film are understood in light of the strong similarity of the oxygen sublattices in these two atomic planes. First‐principles calculations demonstrate strong bonding of the atoms at the interface, which is also corroborated by the observation of misfit dislocations at the interfaces.

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Enhanced bending-tuned magnetic properties in epitaxial cobalt ferrite nanopillar arrays on flexible substrates

Abstract: Epitaxial (111) CoFe2O4 nanopillar arrays were successfully grown on flexible fluorophlogopite substrates with strong bending-related magnetic properties.

Cited by 34 publications

References 44 publications

A Strategy to Modulate the Bending Coupled Microwave Magnetism in Nanoscale Epitaxial Lithium Ferrite for Flexible Spintronic Devices

A Strategy to Modulate the Bending Coupled Microwave Magnetism in Nanoscale Epitaxial Lithium Ferrite for Flexible Spintronic Devices

Local Stiffness Effect on Ferromagnetic Response of Nanostructure Arrays in Stretchable Systems

Atomic Scale Understanding of the Epitaxy of Perovskite Oxides on Flexible Mica Substrate

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