Mechanically tunable magnetic and electronic transport properties of flexible magnetic films and their heterostructures for spintronics

Chen, Xia; Mi, Wenbo

doi:10.1039/d1tc01989a

Cited by 14 publications

(11 citation statements)

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“…Mechanical bending is the most common way employed in literature to actively control the strain in oxide thin film. [ 141 ] Two main types of strategies were developed: 1) bending of layers supported on a flexible or curved substrate (Figure 7c) and 2) bending of self‐standing thin films (Figure 7d). In both cases, bending generates an in‐plane strain,

{\varepsilon _x}

, along the bending direction proportional to the distance, b i , from the neutral plane:

\begin{equation} {\rm{\;}}{\varepsilon _x} = \frac{\beta }{R} \end{equation}

where R is the radius of curvature of neutral plane.…”

Section: Strain Control In Freestanding Perovskite Oxide Thin Filmsmentioning

confidence: 99%

Freestanding Perovskite Oxide Films: Synthesis, Challenges, and Properties

et al. 2022

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In this review paper, recent progress in the fabrication, transfer, and fundamental physical properties of freestanding oxide perovskite thin films is discussed. First, the main strategies for the synthesis and transfer of freestanding perovskite thin films are analyzed. In this initial section, particular attention is devoted to the use of water-soluble (Ca,Sr,Ba) 3 Al 2 O 6 thin films as sacrificial layers, one of the most promising techniques for the fabrication of perovskite membranes. The main functionalities that have been observed in freestanding perovskite thin films are then reviewed. In doing so, the authors begin by describing the emergence of new phenomena in ultrathin perovskite membranes when released from the substrate. They then move on to a summary of the functional properties that are observed in freestanding perovskite membranes under the application of strain. Indeed, freestanding thin films offer the unique possibility to actively control the strain state far beyond what can be observed with traditional methods, allowing the investigation of the profound interplay between structural and electronic properties in oxides. Overall, this review highlights the potential of oxide-based freestanding thin films to become the preferred platform for the study of novel functionalities in perovskite oxide materials.

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{\varepsilon _x}

, along the bending direction proportional to the distance, b i , from the neutral plane:

\begin{equation} {\rm{\;}}{\varepsilon _x} = \frac{\beta }{R} \end{equation}

where R is the radius of curvature of neutral plane.…”

Section: Strain Control In Freestanding Perovskite Oxide Thin Filmsmentioning

confidence: 99%

Freestanding Perovskite Oxide Films: Synthesis, Challenges, and Properties

et al. 2022

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“…Instead of polymer films, rigid substrates such as silicon wafers and glasses can also become flexible by decreasing their thickness to a micrometer range. − For example, Pérez et al reported the flexible GMR sensors on an ultrathin silicon substrate with thicknesses of 100 and 50 μm . As presented in Figure (B1), the fabrication process started with the deposition of GMR multilayers on silicon wafers, followed by a grinding process from the backsides of the wafers to reduce the thickness to 100 or 50 μm.…”

Section: Overview Of Different Types Of Gmr Sensorsmentioning

confidence: 99%

Giant Magnetoresistance Biosensors in Biomedical Applications

Tonini

Liang

et al. 2022

ACS Appl. Mater. Interfaces

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The giant magnetoresistance (GMR) effect has seen flourishing development from theory to application in the last three decades since its discovery in 1988. Nowadays, commercial devices based on the GMR effect, such as hard-disk drives, biosensors, magnetic field sensors, microelectromechanical systems (MEMS), etc., are available in the market, by virtue of the advances in state-of-the-art thin-film deposition and micro- and nanofabrication techniques. Different types of GMR biosensor arrays with superior sensitivity and robustness are available at a lower cost for a wide variety of biomedical applications. In this paper, we review the recent advances in GMR-based biomedical applications including disease diagnosis, genotyping, food and drug regulation, brain and cardiac mapping, etc. The GMR magnetic multilayer structure, spin valve, and magnetic granular structure, as well as fundamental theories of the GMR effect, are introduced at first. The emerging topic of flexible GMR for wearable biosensing is also included. Different GMR pattern designs, sensor surface functionalization, bioassay strategies, and on-chip accessories for improved GMR performances are reviewed. It is foreseen that combined with the state-of-the-art complementary metal-oxide-semiconductor (CMOS) electronics, GMR biosensors hold great promise in biomedicine, particularly for point-of-care (POC) disease diagnosis and wearable devices for real-time health monitoring.

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“…For example, topological insulators are natural candidates for low-power spintronics because of their intrinsic dissipationless feature. It is possible, for example, to combine the mechanical strain and the giant magnetoresistance of a ferromagnet junction of the topological insulator to construct a novel straintronics device with a robust strain-controllable magnetic switch [ 168 ], and even tune magnetic and electronic properties mechanically [ 169 ]. These recent studies of strain-sensitive giant magnetoresistance responses, along with other phenomena, have indicated that these types of devices have a great potential for low-power nanoscale strain sensors and other sensing applications.…”

Section: Mathematical and Computational Models For Smart Materials An...mentioning

confidence: 99%

Coupled Multiphysics Modelling of Sensors for Chemical, Biomedical, and Environmental Applications with Focus on Smart Materials and Low-Dimensional Nanostructures

Singh

Melnik

2022

Chemosensors

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Low-dimensional nanostructures have many advantages when used in sensors compared to the traditional bulk materials, in particular in their sensitivity and specificity. In such nanostructures, the motion of carriers can be confined from one, two, or all three spatial dimensions, leading to their unique properties. New advancements in nanosensors, based on low-dimensional nanostructures, permit their functioning at scales comparable with biological processes and natural systems, allowing their efficient functionalization with chemical and biological molecules. In this article, we provide details of such sensors, focusing on their several important classes, as well as the issues of their designs based on mathematical and computational models covering a range of scales. Such multiscale models require state-of-the-art techniques for their solutions, and we provide an overview of the associated numerical methodologies and approaches in this context. We emphasize the importance of accounting for coupling between different physical fields such as thermal, electromechanical, and magnetic, as well as of additional nonlinear and nonlocal effects which can be salient features of new applications and sensor designs. Our special attention is given to nanowires and nanotubes which are well suited for nanosensor designs and applications, being able to carry a double functionality, as transducers and the media to transmit the signal. One of the key properties of these nanostructures is an enhancement in sensitivity resulting from their high surface-to-volume ratio, which leads to their geometry-dependant properties. This dependency requires careful consideration at the modelling stage, and we provide further details on this issue. Another important class of sensors analyzed here is pertinent to sensor and actuator technologies based on smart materials. The modelling of such materials in their dynamics-enabled applications represents a significant challenge as we have to deal with strongly nonlinear coupled problems, accounting for dynamic interactions between different physical fields and microstructure evolution. Among other classes, important in novel sensor applications, we have given our special attention to heterostructures and nucleic acid based nanostructures. In terms of the application areas, we have focused on chemical and biomedical fields, as well as on green energy and environmentally-friendly technologies where the efficient designs and opportune deployments of sensors are both urgent and compelling.

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Mechanically tunable magnetic and electronic transport properties of flexible magnetic films and their heterostructures for spintronics

Abstract: The incorporation of flexible conception into spintronics has attracted long-standing scientific attention because the contemporary consumer electronic devices compared with conventional silicon-based counterparts urgently needs spintronic devices can be shaped...

Cited by 14 publications

References 171 publications

Freestanding Perovskite Oxide Films: Synthesis, Challenges, and Properties

Freestanding Perovskite Oxide Films: Synthesis, Challenges, and Properties

Giant Magnetoresistance Biosensors in Biomedical Applications

Coupled Multiphysics Modelling of Sensors for Chemical, Biomedical, and Environmental Applications with Focus on Smart Materials and Low-Dimensional Nanostructures

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