Exchange Bias Tuning for Magnetoresistive Sensors by Inclusion of Non-Magnetic Impurities

Sharma, Parikshit Pratim; Albisetti, Edoardo; Monticelli, Marco; Bertacco, Riccardo; Petti, Daniela

doi:10.3390/s16071030

Cited by 28 publications

(18 citation statements)

References 43 publications

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“…Co 40 Fe 40 B 20 45 nm/Ru 0.6 nm/Co 40 Fe 40 B 20 45 nm/Ir 22 Mn 78 10 nm/Ru 2 nm stacks were deposited on 200 nm thick Si 3 N 4 membranes by direct current magnetron sputtering using an AJA Orion8 system with a base pressure below 1 × 10 −8 Torr, using conditions similar to ref. . During the deposition, a 30 mT magnetic field was applied in the sample plane for setting the exchange bias direction in the as‐grown sample.…”

Section: Methodsmentioning

confidence: 99%

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

et al. 2020

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Integrated optically inspired wave‐based processing is envisioned to outperform digital architectures in specific tasks, such as image processing and speech recognition. In this view, spin waves represent a promising route due to their nanoscale wavelength in the gigahertz frequency range and rich phenomenology. Here, a versatile, optically inspired platform using spin waves is realized, demonstrating the wavefront engineering, focusing, and robust interference of spin waves with nanoscale wavelength. In particular, magnonic nanoantennas based on tailored spin textures are used for launching spatially shaped coherent wavefronts, diffraction‐limited spin‐wave beams, and generating robust multi‐beam interference patterns, which spatially extend for several times the spin‐wave wavelength. Furthermore, it is shown that intriguing features, such as resilience to back reflection, naturally arise from the spin‐wave nonreciprocity in synthetic antiferromagnets, preserving the high quality of the interference patterns from spurious counterpropagating modes. This work represents a fundamental step toward the realization of nanoscale optically inspired devices based on spin waves.

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Section: Methodsmentioning

confidence: 99%

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

et al. 2020

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“…The sensor stacks consist of a CoFeB/MgO/CoFeB MTJ, where the magnetization of the bottom layer is pinned by a synthetic antiferromagnet [29]. The multilayers were grown on Si/SiO2 substrates by magnetron sputtering in an AJA Orion8 system with a base pressure of 2•10 -9 Torr and an applied magnetic field of 300 Oe [21,30].…”

Section: Sensor Definitionmentioning

confidence: 99%

Integrated platform for detecting pathogenic DNA via magnetic tunneling junction-based biosensors

Sharma

Albisetti

Massetti

et al. 2017

Sensors and Actuators B: Chemical

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In recent years, the development of portable platforms for performing fast and point-of-care analyses has drawn considerable attention for their wide variety of applications in life science. In this framework, tools combining magnetoresistive biosensors with magnetic markers have been widely studied in order to detect concentrations of specific molecules, demonstrating high sensitivity and ease of integration with conventional electronics. In this work, first, we develop a protocol for efficient hybridization of natural DNA; then, we show the detection of hybridization events involving natural DNA, namely genomic DNA extracted from the pathogenic bacterium Listeria monocytogenes, via a compact magnetic tunneling junction (MTJ)-based biosensing apparatus. The platform comprises dedicated portable electronic and microfluidic setups, enabling point-of-care biological assays. A sensitivity below the nM range is demonstrated. This work constitutes a step forward towards the development of portable lab-on-chip platforms, for the multiplexed detection of pathogenic health threats in food and food processing environment

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“…Some of the features that makes SAFs extremely interesting for applications is their wide applicability to in-plane as well out-of-plane magnetized materials, their large tunability via layer thickness and material composition, and the possibility to combine SAF and exchange bias by adding an antiferromagnetic layer to the stack. Throughout the years, SAFs were successfully used in spin-valves [4,5] and magnetic tunnel junctions [6][7][8][9] as reference layers, with applications as read heads in magnetoresistive [10,11] hard drives [12], magnetic random access memories (MRAM) [13][14][15], microwave oscillators [16] and magnetic biosensors [17][18][19][20][21][22]. More recently, SAFs have been proposed as base materials for racetrack memories [23], due to the higher domain wall velocity with respect to single ferromagnetic layers [24], and their capability to host a range of topological spin-textures [25].…”

Section: Introductionmentioning

confidence: 99%

Temperature Dependence of the Magnetic Properties of IrMn/CoFeB/Ru/CoFeB Exchange Biased Synthetic Antiferromagnets

et al. 2020

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Synthetic antiferromagnets (SAF) are widely used for a plethora of applications among which data storage, computing, and in the emerging field of magnonics. In this framework, controlling the magnetic properties of SAFs via localized thermal treatments represents a promising route for building novel magnonic materials. In this paper, we study via vibration sample magnetometry the temperature dependence of the magnetic properties of sputtered exchange bias SAFs grown via magnetron sputtering varying the ferromagnetic layers and spacer thickness. Interestingly, we observe a strong, reversible modulation of the exchange field, saturation field, and coupling strength upon heating up to 250 °C. These results suggest that exchange bias SAFs represent promising systems for developing novel artificial magnetic nanomaterials via localized thermal treatment.

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Exchange Bias Tuning for Magnetoresistive Sensors by Inclusion of Non-Magnetic Impurities

Cited by 28 publications

References 43 publications

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

Optically Inspired Nanomagnonics with Nonreciprocal Spin Waves in Synthetic Antiferromagnets

Integrated platform for detecting pathogenic DNA via magnetic tunneling junction-based biosensors

Temperature Dependence of the Magnetic Properties of IrMn/CoFeB/Ru/CoFeB Exchange Biased Synthetic Antiferromagnets

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