Giant Magnetoresistance: Basic Concepts, Microstructure, Magnetic Interactions and Applications

Ennen, Inga; Kappe, Daniel; Rempel, Thomas; Glenske, Claudia; Hütten, Andreas

doi:10.3390/s16060904

Cited by 154 publications

(89 citation statements)

References 122 publications

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“…On hierarchical structures following immobilization of enzymes was also studied . Even for nonmagnetic spacer layer, enhanced magnetic properties were observed due to the increase of magnetic moment at the interfacial regions as it was already predicted and observed in case of multilayers . Effect of the magnetic moment modification and therefore hyperfine magnetic field increase can be expected for some of the magnetic 3d elements and can be observed in multilayered systems …”

Section: Introductionmentioning

confidence: 55%

“…[26] Even for nonmagnetic spacer layer, enhanced magnetic properties were observed due to the increase of magnetic moment at the interfacial regions as it was already predicted and observed in case of multilayers. [27] Effect of the magnetic moment modification and therefore hyperfine magnetic field increase can be expected for some of the magnetic 3d elements and can be observed in multilayered systems. [28][29][30] In this paper, core-shell nanoparticles were fabricated, where each layer was composed of magnetic elements.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ferrite Core‐Shell Nanoparticles Synthesized by Seed‐Based Method Characterization and Potential Application

Klekotka

Piotrowska

Satuła

et al. 2018

Physica Status Solidi (a)

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This paper is dedicated to a systematic study on the selected type of core‐shell magnetic nanoparticles. Described fabrication procedure adopts the idea of seeds‐based synthesis followed by subsequent layer growth. Each layer of formed particles is obtained from complexes of M(acac)x, where M stands for 3d elements (Fe, Co, Ni, Mn) and x is equal to 2 or 3 resulting in oxide formation. Obtained core‐shell nanoparticles are structurally examined by X‐ray diffraction, infra‐red spectroscopy, and transmission electron microscopy. Magnetic properties of the proposed nanoparticles are tested by Mössbauer spectroscopy. Variable in layered manner composition allows for tuning of physicochemical properties of the investigated material. Designed on demand layer‐by‐layer growth gives the opportunity to obtain desired final properties of, for example, sensing character or selectivity of interacting spices.

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Section: Introductionmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Ferrite Core‐Shell Nanoparticles Synthesized by Seed‐Based Method Characterization and Potential Application

Klekotka

Piotrowska

Satuła

et al. 2018

Physica Status Solidi (a)

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“…23,60 In an MR sensor, the resistance changes with the variation of the external magnetic field; the magnetoresistance value is defined as the total resistance variation (DR) normalized to its minimum value (R min ). [61][62][63][64][65][66][67][68] For applications in biomedicine and specifically in biosensing, the feature of MR sensors which is of significance is their ability to detect very weak magnetic fields (nT) at room temperature. For more than a decade, several research groups worldwide are focusing on the design and development of MR biosensing platforms for biomolecular recognition as well as detection and quantification of biological entities.…”

Section: -3mentioning

confidence: 99%

“…One of the most successful developments in the field that has also been commercialized is that of the Wang group from Stanford University and MagArray, Inc. 20,26,62,72,73,79,[87][88][89][90] Their biosensing platform has been verified for a number of applications such as cancer diagnostics, immune diagnostics, vaccine responses, and probing of protein-protein interactions. The development of the Eigen Diagnosis Platform (EDP) interfaced with a smartphone revolutionizes portable and affordable diagnostics.…”

Section: State-of-the-artmentioning

confidence: 99%

Perspective: Magnetoresistive sensors for biomedicine

Giouroudi

Hristoforou

2018

Journal of Applied Physics

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Currently, there is a plethora of sensors (e.g., electrochemical, optical, and piezoelectric) used in life sciences for either analyte detection or diagnostic purposes, but in the last decade, magnetic biosensors have received extended interest as a promising candidate for the development of next-generation, highly sensitive biomedical platforms. This approach is based on magnetic labeling, replacing the otherwise classic fluorescence labeling, combined with magnetic sensors that detect the stray field of the superparamagnetic markers (e.g., magnetic micro-nanoparticles or magnetic nanostructures). Apart from the increased sensitivity, magnetic biosensors exhibit the unique ability of controlling and modulating the superparamagnetic markers by an externally applied magnetic force as well as the capability of compact integration of their electronics on a single chip. The magnetic field sensing mechanism most widely investigated for applications in life sciences is based on the magnetoresistance (MR) effect that was first discovered in 1856 by Lord Kelvin. However, it is the giant magnetoresistance effect, discovered by Grünberg and Fert in 1988, that actually exhibits the greatest potential as a biosensing principle. This perspective will shortly explain the magnetic labeling method and will provide a brief overview of the different MR sensor technologies (giant magnetoresistive, spin valves, and tunnel magnetoresistive) mostly used in biosensing applications as well as a compact assessment of the state of the art. Newly implemented innovations and their broad-ranging implications will be discussed, challenges that need to be addressed will be identified, and new hypotheses will be proposed.

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“…Among the "Ferromagnetic/Normal metal" (FM/NM) systems the Co/Cu periodic structures remain attractive due to their magnetoresistive properties and manufacturability [4,5]. The Giant Magnetoresistive effect (GMR) in such nanofilms is attributed to the antiferromagnetic (AF) exchange coupling between Co layers through conductivity electrons of copper and depends on both the thickness of Cu layers and structure of the Co/Cu interfaces [6][7].…”

Section: Introductionmentioning

confidence: 99%

Faraday effect and fragmentation of ferromagnetic layers in multilayer Co/Cu(1 1 1) nanofilms

Lukienko

Kharchenko

Fedorchenko

et al. 2020

Journal of Magnetism and Magnetic Materials

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With purpose to investigate influence of magnetically non-active metal layers on the Faraday effect in multilayer Ferromagnetic/Normal metal films, dependences of the Faraday rotation angles of the light polarization plane on magnetic field have been studied in multilayer [Co/Cu] nanofilms. It was revealed that the Faraday rotation φ varies with thickness of the Cu layers d Cu . This φ(d Cu ) dependence consists of the monotonic component, namely a gradual rise of the angle with increase of d Cu , and the non-monotonic one represented by two minima. The monotonic changes of the Faraday rotation were satisfactory described in frames of the effective medium method. Two minima are explained with the Co layer's fragmentation due to influence of size electron quantization in the Cu layers on formation of Co clusters during deposition of the films.

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Giant Magnetoresistance: Basic Concepts, Microstructure, Magnetic Interactions and Applications

Cited by 154 publications

References 122 publications

Ferrite Core‐Shell Nanoparticles Synthesized by Seed‐Based Method Characterization and Potential Application

Ferrite Core‐Shell Nanoparticles Synthesized by Seed‐Based Method Characterization and Potential Application

Perspective: Magnetoresistive sensors for biomedicine

Faraday effect and fragmentation of ferromagnetic layers in multilayer Co/Cu(1 1 1) nanofilms

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