Discovery of Enhanced Magnetoelectric Coupling through Electric Field Control of Two-Magnon Scattering within Distorted Nanostructures

Xue, Xu; Zhou, Ziyao; Feng, Mengmeng; Zhang, Yijun; Zhao, Shirong; Hu, Zhongqiang; Ren, Wei; Ye, Zuo‐Guang; Liu, Yaohua; Liu, Ming

doi:10.1021/acsnano.7b04653

Cited by 47 publications

(43 citation statements)

References 40 publications

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“…It is also clear from Figure c that the smaller curvature of the sample is, the more magnetic vector component will be in in‐plane direction, that is 0 < 7.5‐M′ in‐plane < 5.0‐M′ in‐plane < 2.5‐M′ in‐plane . Thus, the second absorption peak position is shifted close to the in‐plane configuration (lower resonance field) due to magnetocrystalline anisotropy . The schematic is shown in Figure c.…”

Section: Resultsmentioning

confidence: 92%

“…The change of the out‐of‐plane FMR spectra is mainly ascribed to the contribution of in‐plane absorption peak. As long as the sample is put under a bending curvature, there is a magnetic field vector component (M′ in‐plane ) existed along the in‐plane direction when applying a magnetic field along the out‐of plane, i.e., there are both in‐plane and out‐of‐plane contributions . So, the second absorption peak will be observed in the out‐of‐plane FMR spectra, as depicted in Figure .…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

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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“…Typical voltage‐tuned hysteresis loops of configuration I and II are presented in Figure . For the (011) cut PMN‐PT, the E‐field along thickness direction could generate an in‐plane compressive strain along the [100] direction (d 31 = −1800 pC N −1 , θ = 0° in configuration I) and a tensile strain along the [0‐11] direction (d 32 = 900 pC N −1 , θ = 0° in configuration II) . The charge effect is only active at the FM/ferroelectric interface and is ineffective for multilayer systems.…”

Section: Resultsmentioning

confidence: 99%

Voltage Control of Perpendicular Exchange Bias in Multiferroic Heterostructures

Zhang

et al. 2019

Adv Elect Materials

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is one of the most decisive factors in the excellent performance of spintronic devices. [1,2] Researches have intensely studied EB properties due to the importance applications in magnetic random access memories and magnetoresistive read heads based on spin valves or tunnel junctions. [3] If EB is combined with the perpendicular magnetic anisotropy (PMA), [1] it is promising to develop magnetic devices with ultrahigh density. [4] One existing challenge for AFM spintronics is the effective regulation of magnetization. [5] Although the AFM materials are essentially magnetic, they do not have macroscopic magnetization due to the alternatively antiparallel magnetic spins. [6] Therefore, AFM materials are very insensitive to the magnetic perturbation. [7] As an alternative, voltage control of magnetism provides a promising way in realizing next generation of fast, compact, and energy-efficient magnetic memories and sensors. [8][9][10] There are some studies related to the piezoelectric strain-controlled EB with in-plane anisotropy, [9,11,12] demonstrating the feasibility of using electric field (E-field) to manipulate AFM moments and domains. E-field induced interfacial strain mediation can also regulate the spin structure of AFM materials [13] with an excellent fatigue durability, [14] which is promising in anti-ferromagnetic piezospintronics. Nevertheless, because the alternative spins of AFM materials are strongly pinned, [15] the existing E-field controls of EB and AFM spins are usually confined at a low temperature [1,16] or require a large H-field assistance. [13] Although the magnetoelectric (ME) switching of perpendicular EB has been studied by changing the interfacial exchange and magnetization at low temperature, [1] the control of perpendicular EB by strain-mediated ME coupling has not been demonstrated yet. Therefore, we considered perpendicular EB on ferroelectric Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) [17] substrate to realize the electrical modulation of anti-ferromagnetism.In this work, we utilized vibrating sample measurements (VSM) and ferromagnetic resonance (FMR) to study the strainmediated voltage control effect. Both the film fabrication and characterization were carried at room temperature, which has overcome the requirement of a high-temperature magnetic annealing during the EB formation [18] as well as the difficulty of Perpendicular exchange bias (EB), which combines perpendicular magnetic anisotropy and ferromagnetic (FM)-anti-ferromagnetic (AFM) exchange coupling, is extremely important in high-density AFM spintronics. However, the effective modulation of EB remains challenging, since the alternant spins at the AFM/ FM interface are strongly pinned by the AFM layer. Voltage tuning of EB through magnetoelectric coupling provides a potential way to achieve rapid magnetization switching in an energy-efficient manner. Nevertheless, the interfacial strain mediation of perpendicular EB induced by E-field remains unexplored. In this work, perpendicular EB nanostructure by room-temperature fabri...

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“…The absence of multiferroics with the desired properties has pushed toward the investigation of heterostructures in which two components with different ferroic orders are coupled through an interface to obtain enhanced performances . The most typical example of this process is represented by ferromagnetic films deposited onto ferroelectric substrates . Three main mechanisms are reported in literature as responsible of the interfacial magnetoelectric coupling: charge accumulation or depletion at the interface, strain‐mediated effects and ion migration .…”

Section: Introductionmentioning

confidence: 99%

“…Three main mechanisms are reported in literature as responsible of the interfacial magnetoelectric coupling: charge accumulation or depletion at the interface, strain‐mediated effects and ion migration . In this contest, topographical studies of the heterostructure are relatively rare . More importantly, they do not take into account possible modifications of the morphology after ferroelectric transitions.…”

Section: Introductionmentioning

confidence: 99%

Reversible Modification of Ferromagnetism through Electrically Controlled Morphology

Vinai

Motti

Bonanni

et al. 2019

Adv Elect Materials

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Converse magnetoelectric coupling in artificial multiferroics is generally modeled through three possible mechanisms: charge transfer, strain mediated effects or ion migration. Here the role played by electrically controlled morphological modifications on the ferromagnetic response of a multiferroic heterostructure, specifically FexMn1−x ferromagnetic films on piezoferroelectric PMN‐PT [001] substrates, is discussed. The substrates present, in correspondence to electrical switching, fully reversible morphological changes at the surface, to which correspond reproducible modifications of the ferromagnetic response of the FexMn1−x films. Topographic analysis by atomic force microscopy shows the formation of surface cracks (up to 100 nm in height) upon application of a sufficiently high positive electric field (up to 6 kV cm−1). The cracks disappear after application of negative electric field of the same magnitude. Correspondingly, in operando X‐ray magnetic circular dichroic spectroscopy at Fe edge in FexMn1−x layers and micro‐MOKE measurements show local variations in the intensity of the dichroic signal and in the magnetic anisotropy as a function of the electrically driven morphological state. This morphologic parameter, rarely explored in literature, directly affects the ferromagnetic response of the system. Its proof of electrically reversible modification of the magnetic response adds a new possibility in the design of electrically controlled magnetic devices.

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Discovery of Enhanced Magnetoelectric Coupling through Electric Field Control of Two-Magnon Scattering within Distorted Nanostructures

Cited by 47 publications

References 40 publications

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

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

Voltage Control of Perpendicular Exchange Bias in Multiferroic Heterostructures

Reversible Modification of Ferromagnetism through Electrically Controlled Morphology

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Discovery of Enhanced Magnetoelectric Coupling through Electric Field Control of Two-Magnon Scattering within Distorted Nanostructures

Cited by 47 publications

References 40 publications

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

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

Voltage Control of Perpendicular Exchange Bias in Multiferroic Heterostructures

Reversible Modification of Ferromagnetism through Electrically Controlled Morphology

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Product

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

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