Stress-coefficient of magnetoelastic anisotropy in flexible Fe, Co and Ni thin films

Chen, Xiaoyuan; Wang, Baomin; Wen, Xingcheng; Sheng, Ping; Dhanapal, Pravarthana; Yang, Huali; Xie, Yali; Liu, Haigang; Xu, Xin; Li, Run-Wei

doi:10.1016/j.jmmm.2020.166750

Cited by 9 publications

(8 citation statements)

References 22 publications

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“…Interestingly, normalΔ K U eff normalI normalP /Δσ also presents a strong dependence on the Co thickness; the stress coefficient decreases by almost 5 times as t increases from 0.75 to 3.0 nm (Figure S10). At t = 3.0 nm, the stress coefficient (0.02 × 10 6 erg/(cm 3 GPa)) is comparable to that of the bulk value . Therefore, the interfacial magnetoelastic anisotropy dominates at reduced Co thickness, which could be attributed to an enhanced Co orbital moment .…”

Section: Resultsmentioning

confidence: 82%

“…Dependence of (b) K U eff normalO normalP and (c) normalΔ K U eff normalO normalP /Δσ on the inverse of Co thickness t . The data point corresponding to t = 15 nm in (c) is adapted with permission from ref . Copyright 2020 Elsevier.…”

Section: Resultsmentioning

confidence: 99%

“…Until now, there have been a large number of studies on the influence of stress on the magnetic anisotropy in flexible magnetic thin films. For example, Dai et al deposited Fe 81 Ga 19 films on flexible polyethylene terephthalate (PET) substrates; they found that the magnetic easy (hard) axis can be tuned to the hard (easy) axis by bending the flexible substrate. , In addition to FeGa, many other flexible magnetic films such as CoFeB, Fe, Co, and Ni films have been found to show significant magnetic anisotropy change upon mechanical stress, which deteriorates the performance of flexible magnetoelectronic devices. − Therefore, finding solutions to reducing the adverse effect of mechanical stress on magnetic anisotropy is quite demanding.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced Stress Stability in Flexible Co/Pt Multilayers with Strong Perpendicular Magnetic Anisotropy

Li,

Yang,

Xie

et al. 2023

Nano Lett.

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Due to the magnetoelastic coupling, the magnetic properties of many flexible magnetic films (such as Fe, Co, and Ni) are sensitive to mechanical stress, which deteriorates the performance of flexible magnetoelectronic devices. We show that by stacking Co and Pt alternatively to form multilayers with strong perpendicular magnetic anisotropy (PMA), both magnetic hysteresis and magnetic domain measurements reveal robust PMA against external stress. As the PMA weakens at increased Co thickness, the magnetic anisotropy is vulnerable to external stress. These results were understood based on a micromagnetic model, which suggests that the strength of magnetoelastic anisotropy with respect to initial effective magnetic anisotropy affects the stress-stability of the film. Although the stress coefficient of magnetoelastic anisotropy is enhanced at reduced Co thickness, the concomitant increase of initial effective magnetic anisotropy guarantees a robust PMA against external stress. Our results provide a route to constructing flexible magnetoelectronic devices with enhanced stress stability.

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Section: Resultsmentioning

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Enhanced Stress Stability in Flexible Co/Pt Multilayers with Strong Perpendicular Magnetic Anisotropy

Li,

Yang,

Xie

et al. 2023

Nano Lett.

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“…Cluster-assembled composites have recently gained increasing attention because of their unique structural compatibility and stability [10,11]. In addition there are various other phenomena and devices related to magnetic anisotropy, but the origin is beyond the theoretical scope of crystal polycrystalline symmetry [12][13][14][15]. Thus, clarifying the origin and further obtaining high-strength magnetoelastic anisotropy are crucially important not only for the fundamental magnetism but also for the design of flexible ME composites.…”

Section: Introductionmentioning

confidence: 99%

Sensitive angle-dependent magnetoelectric coupling in cluster-assembled flexible composites

Jiang

Bai

et al. 2022

J. Phys.: Condens. Matter

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Flexible magnetoelectric device is one of the indispensable elements. However, the complicated fabrication process and low sensitivity hinders the practical applications. Here, flexible NiFe anisotropic magnetoelastic composites were prepared by cluster–supersonic expansion method assistant with polyvinylidene fluoride (PVDF) substrates. The NiFe/PVDF composites possess sensitive angle–resolution magnetoelectric coupling coefficient at room temperature, and the value can reach 0.66 μV/deg. The strong anisotropic magnetoelasticity phenomenon is reminiscent of the short–range ordered cluster structure. The anisotropic magnetoelastic coefficient can be deduced by temperature– and magnetic field strength–dependent anisotropic magnetoresistance. The magnetic torque results also prove the strong anisotropic magnetoelastic trait. The coupling between piezoelectricity and anisotropic magnetostrictive effect endows great possibilities toward flexible electronic compass. These results shed light on future in non–invasive tracking of vital biological health via wearable electronic devices.

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“…However, the elasticity of functional layers and polymer substrates is significantly different: for materials with a certain tensile capacity, such as carbon nanotubes and Ag nanowire, the functional layer can be stretched [11,12] and bent [13] to a certain extent. However, for many functional materials, such as metallic thin films, are almost non-stretchable [14][15][16], and will crack under a very small tensile strain, thus making the device unusable.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Analysis and Experimental Studies of the Transverse Strain in Wrinkled Metallic Thin Films

Nie

Wang

Liu

et al. 2021

Metals

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The wrinkling structures, which can greatly improve the stretchability of the metallic thin films, have been widely used in the preparation of stretchable devices. However, the artificial wrinkling structures are often accompanied by the generation of microcracks, which seriously affect the performance of the devices. In this work, by establishing the corresponding model, the transverse strain of the longitudinally prestrained continuous film and the strip film is mechanically analyzed, which is verified by experimental results; for the strain of blank substrate, the error of the model was about 3.7%. It is difficult to avoid the generation of microcracks with continuous films, but strip films can avoid the generation of microcracks to a certain extent. The experimental results illustrate the various factors affecting the generation of microcracks. The transverse strain of the film is proportional to the substrate’s Young’s modulus, Poisson’s ratio, thickness, and prestrain and is basically inversely proportional to the strip film’s Young’s modulus, thickness, and strip interval. Our results provide deeper knowledge for choosing proper metallic materials to fabricate stretchable wrinkled devices.

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Stress-coefficient of magnetoelastic anisotropy in flexible Fe, Co and Ni thin films

Cited by 9 publications

References 22 publications

Enhanced Stress Stability in Flexible Co/Pt Multilayers with Strong Perpendicular Magnetic Anisotropy

Enhanced Stress Stability in Flexible Co/Pt Multilayers with Strong Perpendicular Magnetic Anisotropy

Sensitive angle-dependent magnetoelectric coupling in cluster-assembled flexible composites

Mechanical Analysis and Experimental Studies of the Transverse Strain in Wrinkled Metallic Thin Films

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