Local magnetization and strain in single magnetoelectric microrod composites

Hrkac, Stjepan; Abes, M.; Koops, C. T.; Krywka, Christina; Müller, Martin; Kaps, Sören; Adelung, Rainer; McCord, Jeffrey; Lage, Enno; Quandt, Eckhard; Magnussen, Olaf M.; Murphy, Bridget

doi:10.1063/1.4821443

Cited by 8 publications

(14 citation statements)

References 23 publications

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“…The diameter of the microrods can range from 1 to 100 µm and with lengths between 200-5000 µm. The structure of individual microrods was investigated earlier using X-ray nanobeam diffraction revealing their single crystalline nature 36 . Single ZnO microrods with diameters of about 13 µm and lengths of about 5 mm were selected manually for the sensor devices.…”

Section: Methodsmentioning

confidence: 99%

Concept and modelling of memsensors as two terminal devices with enhanced capabilities in neuromorphic engineering

Vahl

Carstensen

Kaps

et al. 2019

Sci Rep

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We report on memsensors, a class of two terminal devices that combines features of memristive and sensor devices. Apart from a pinched hysteresis (memristive property) and stimulus dependent electrical resistance (sensing property) further properties like dynamic adaptation to an external stimulus emerge. We propose a three component equivalent circuit to model the memsensor electrical behaviour. In this model we find stimulus dependent hysteresis, a delayed response to the sensory signal and adaptation. Stimulus dependent IV hysteresis as a fingerprint of a memsensor device is experimentally shown for memristive ZnO microrods. Adaptation in memsensor devices as found in our simulations resembles striking similarities to the biology. Especially the stimulus dependency of the IV hysteresis and the adaptation to external stimuli are superior features for application of memsensors in neuromorphic engineering. Based on the simulations and experimental findings we propose design rules for memsensors that will facilitate further research on memsensitive systems.

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Section: Methodsmentioning

confidence: 99%

Concept and modelling of memsensors as two terminal devices with enhanced capabilities in neuromorphic engineering

Vahl

Carstensen

Kaps

et al. 2019

Sci Rep

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“…ZnO microneedles used for 2–1 ME composite sensors were grown by using the flame transport synthesis (FTS) approach . In the FTS process, Zn microparticles (diameter <10 μm, 99.5%, Goodfellows UK), polyvinyl‐butyrol (PVB) sacrificial polymer powder (Kuraray GmbH, Europe), and ethanol are mixed together in form of a gray slurry paste as the precursor material.…”

Section: Methodsmentioning

confidence: 99%

Piezotronic‐based magnetoelectric sensor: Fabrication and response

Gröttrup

Kaps

Carstensen

et al. 2016

Physica Status Solidi (a)

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In the present work, magnetoelectric‐piezotronic devices have been fabricated using exceptionally long (mm long) ZnO nano‐ and microneedles grown by the simple and versatile flame transport synthesis approach. The piezotronic response to an applied magnetic field has been investigated for state of the art magnetoelectric (ME) sensors containing AlN and PZT as piezoelectric phase as well as sensors based on ZnO nano‐ and microneedles, which are among the best described materials in terms of piezotronic applications. The current voltage (I–V) characteristics of the fabricated electronic sensor devices have been measured to understand the individual contributions of the piezoelectric and semiconducting properties. The experimentally obtained correlations between the piezotronic effect and the I–V responses have been fitted using appropriate theoretical models which have been discussed in detail. The current observations demonstrate that ME based piezotronic sensing devices have complementary roles, on one hand, the ME principle helps to get a better understanding of the piezotronic nature of quasi one dimensional (Q1D) ZnO nano‐ and microneedles, and on the other hand, the integration of a piezotronic effect leads to an improved sensitivity of the ME devices and hence to a better quality of ME sensors.

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“…The high fracture strain evidenced in the present nanowire samples may be due to their crystalline nature in contrast to a bulk sample. 52,58 Because the fracture occurs by crack nucleation from a defect, the probability of failure has been significantly reduced simply due to the lower sampled volume. The electromechanical behavior of the Q1D ZnO nanowires was then explored in a separate set of experiments where a fixed bias voltage of 0.5 V was applied across the outer two contacts on the nanowire during a tensile test.…”

Section: Resultsmentioning

confidence: 99%

Piezoresistive Response of Quasi-One-Dimensional ZnO Nanowires Using an in Situ Electromechanical Device

et al. 2017

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Quasi-one-dimensional structures from metal oxides have shown remarkable potentials with regard to their applicability in advanced technologies ranging from ultraresponsive nanoelectronic devices to advanced healthcare tools. Particularly due to the piezoresistive effects, zinc oxide (ZnO)-based nanowires showed outstanding performance in a large number of applications, including energy harvesting, flexible electronics, smart sensors, etc. In the present work, we demonstrate the versatile crystal engineering of ZnO nano- and microwires (up to centimeter length scales) by a simple flame transport process. To investigate the piezoresistive properties, particular ZnO nanowires were integrated on an electrical push-to-pull device, which enables the application of tensile strain and measurement of in situ electrical properties. The results from ZnO nanowires revealed a periodic variation in stress with respect to the applied periodic potential, which has been discussed in terms of defect relaxations.

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Local magnetization and strain in single magnetoelectric microrod composites

Cited by 8 publications

References 23 publications

Concept and modelling of memsensors as two terminal devices with enhanced capabilities in neuromorphic engineering

Concept and modelling of memsensors as two terminal devices with enhanced capabilities in neuromorphic engineering

Piezotronic‐based magnetoelectric sensor: Fabrication and response

Piezoresistive Response of Quasi-One-Dimensional ZnO Nanowires Using an in Situ Electromechanical Device

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