Ultra-Compact 100 × 100 μm2 Footprint Hybrid Device with Spin-Valve Nanosensors

Leitao, Diana C.; Coelho, Paulo; Borme, Jérôme; Knudde, Simon; Cardoso, S.

doi:10.3390/s151229809

Cited by 13 publications

(6 citation statements)

References 26 publications

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“…Besides MTJs, highly compact spin valve (SV) sensors have also been fabricated and integrated with CoZrNb MFC. The sensitivity was increased from 0.18%/mT to 0.37%/mT with a gain of 20.7 [72].…”

Section: Integration With Magnetic Flux Concentrator (Mfc)mentioning

confidence: 99%

Advances in Magnetoresistive Biosensors

Saha

et al. 2019

Micromachines

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Magnetoresistance (MR) based biosensors are considered promising candidates for the detection of magnetic nanoparticles (MNPs) as biomarkers and the biomagnetic fields. MR biosensors have been widely used in the detection of proteins, DNAs, as well as the mapping of cardiovascular and brain signals. In this review, we firstly introduce three different MR devices from the fundamental perspectives, followed by the fabrication and surface modification of the MR sensors. The sensitivity of the MR sensors can be improved by optimizing the sensing geometry, engineering the magnetic bioassays on the sensor surface, and integrating the sensors with magnetic flux concentrators and microfluidic channels. Different kinds of MR-based bioassays are also introduced. Subsequently, the research on MR biosensors for the detection of protein biomarkers and genotyping is reviewed. As a more recent application, brain mapping based on MR sensors is summarized in a separate section with the discussion of both the potential benefits and challenges in this new field. Finally, the integration of MR biosensors with flexible substrates is reviewed, with the emphasis on the fabrication techniques to obtain highly shapeable devices while maintaining comparable performance to their rigid counterparts.

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Section: Integration With Magnetic Flux Concentrator (Mfc)mentioning

confidence: 99%

Advances in Magnetoresistive Biosensors

Saha

et al. 2019

Micromachines

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“…MFC made of soft ferromagnetic materials (e.g., NiFe or amorphous Co based alloys) can realize significant sensitivity enhancement to pT level at room temperature [ 77 , 78 , 79 , 80 , 81 ]. In the work presented by Leitao et al [ 81 ] ( Figure 11 ), an ultra-compact sensor consisting of nanometric SV sensor placed within the gap of 6000 Å–thick thin-film MFC element was designed. As shown in Figure 11 b, a maximum gain of 20.7 was obtained for pole-sensor distance of 400 nm with sensitivity increased from 0.18%/mT to 3.7%/mT.…”

Section: Integrated Gmr Technologies With Enhanced Performancementioning

confidence: 99%

“… ( a ) Illustration of an integrated device combing SV sensor and MFCs; ( b ) Transfer curves comparing the isolated SV sensor with the corresponding device including the MFC [ 81 ]. …”

Section: Figurementioning

confidence: 99%

Integrated Giant Magnetoresistance Technology for Approachable Weak Biomagnetic Signal Detections

Shen

2018

Sensors

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With the extensive applications of biomagnetic signals derived from active biological tissue in both clinical diagnoses and human-computer-interaction, there is an increasing need for approachable weak biomagnetic sensing technology. The inherent merits of giant magnetoresistance (GMR) and its high integration with multiple technologies makes it possible to detect weak biomagnetic signals with micron-sized, non-cooled and low-cost sensors, considering that the magnetic field intensity attenuates rapidly with distance. This paper focuses on the state-of-art in integrated GMR technology for approachable biomagnetic sensing from the perspective of discipline fusion between them. The progress in integrated GMR to overcome the challenges in weak biomagnetic signal detection towards high resolution portable applications is addressed. The various strategies for 1/f noise reduction and sensitivity enhancement in integrated GMR technology for sub-pT biomagnetic signal recording are discussed. In this paper, we review the developments of integrated GMR technology for in vivo/vitro biomagnetic source imaging and demonstrate how integrated GMR can be utilized for biomagnetic field detection. Since the field sensitivity of integrated GMR technology is being pushed to fT/Hz0.5 with the focused efforts, it is believed that the potential of integrated GMR technology will make it preferred choice in weak biomagnetic signal detection in the future.

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“…To obtain such a configuration, one electrode, the reference layer, is usually pinned through a synthetic antiferromagnet (SAF) structure [ 14 ], while the anisotropy of the free (sensing) layer is controlled through shape anisotropy [ 15 ] or through a magnetic biasing field. However, these solutions require, in most cases, a complex device design, often with the introduction of permanent magnets [ 16 , 17 ] or the application of external fields [ 18 ]. Another strategy, typically employed in MTJs, is the growth of a free layer with a superparamagnetic behavior or displaying perpendicular magnetic anisotropy (PMA) [ 15 , 19 , 20 ], resulting in a hysteresis free, linear magnetization vs. external magnetic field (M vs. H) curve.…”

Section: Introductionmentioning

confidence: 99%

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

Sharma

Albisetti

Monticelli

et al. 2016

Sensors

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Abstract:The fine control of the exchange coupling strength and blocking temperature ofexchange bias systems is an important requirement for the development of magnetoresistive sensors with two pinned electrodes. In this paper, we successfully tune these parameters in top-and bottom-pinned systems, comprising 5 nm thick Co 40 Fe 40 B 20 and 6.5 nm thick Ir 22 Mn 78 films. By inserting Ru impurities at different concentrations in the Ir 22 Mn 78 layer, blocking temperatures ranging from 220˝C to 100˝C and exchange bias fields from 200 Oe to 60 Oe are obtained. This method is then applied to the fabrication of sensors based on magnetic tunneling junctions consisting of a pinned synthetic antiferromagnet reference layer and a top-pinned sensing layer. This work paves the way towards the development of new sensors with finely tuned magnetic anisotropies.

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Ultra-Compact 100 × 100 μm2 Footprint Hybrid Device with Spin-Valve Nanosensors

Cited by 13 publications

References 26 publications

Advances in Magnetoresistive Biosensors

Advances in Magnetoresistive Biosensors

Integrated Giant Magnetoresistance Technology for Approachable Weak Biomagnetic Signal Detections

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

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