Stretchable Spin Valves on Elastomer Membranes by Predetermined Periodic Fracture and Random Wrinkling

Melzer, Michael; Lin, Gungun; Makarov, Denys; Schmidt, Oliver G.

doi:10.1002/adma.201201898

Cited by 93 publications

(125 citation statements)

References 31 publications

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“…Most of these applications also require higher stretchabilities of the functional components to be integrated. Both aspects, increase of magnetic sensitivity and stretchability, are covered by the stretchable spin valves 167 introduced in this subchapter.…”

Section: Stretchable Spin Valvesmentioning

confidence: 99%

“…Especially in the case of high tensile deformations or repeated loadings, the electrical contact points of wires to the contact pads of the stretchable elements tend to fail much earlier than the occurrence of fatigue of the actual device under investigation 167 .…”

Section: Electrical Contacting Of Stretchable Sensor Devicesmentioning

confidence: 99%

“…A detailed description of the specific features and magnetoelectric characteristics of the four systems prepared on elastomeric supports 166 can be found in the results chapter (section 4.1.5). In addition to the GMR multilayers, a spin valve layer stack was employed on similarly prepared PDMS substrates to create stretchable GMR sensors with high sensitivities and to demonstrate the potential of the developed technology for more complex magnetoelectronic systems 167 . The unconventional substrate demands a few adaptions in the stack design and preparation process in this case.…”

Section: Gmr Layer Stacksmentioning

confidence: 99%

“…In order to induce the exchange bias without field cooling, two permanent magnets were mounted below the sample holder to provide a static in-plane magnetic field of ≈1 kOe on the substrate surface during the whole deposition 167 . This field is able to induce the magnetic order in the growing IrMn layer at room temperature, provided that it is deposited directly onto an already existing ferromagnetic layer 168 .…”

Section: Gmr Layer Stacksmentioning

confidence: 99%

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Stretchable Magnetoelectronics

et al. 2011

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Abstract:In this work, stretchable magnetic sensorics is successfully established by combining metallic thin films revealing a giant magnetoresistance effect with elastomeric materials. Stretchability of the magnetic nanomembranes is achieved by specific morphologic features (e.g. wrinkles), which accommodate the applied tensile deformation while maintaining the electrical and magnetic integrity of the sensor device. The entire development, from the demonstration of the world-wide first elastically stretchable magnetic sensor to the realization of a technology platform for robust, ready-touse elastic magnetoelectronics with fully strain invariant properties, is described. The prepared soft giant magnetoresistive devices exhibit the same sensing performance as on conventional rigid supports, but can be stretched uniaxially or biaxially reaching strains of up to 270% and endure over 1,000 stretching cycles without fatigue. The comprehensive magnetoelectrical characterization upon tensile deformation is correlated with in-depth structural investigations of the sensor morphology transitions during stretching.With their unique mechanical properties, the elastic magnetoresistive sensor elements readily conform to ubiquitous objects of arbitrary shapes including the human skin. This feature leads electronic skin systems beyond imitating the characteristics of its natural archetype and extends their cognition to static and dynamic magnetic fields that by no means can be perceived by human beings naturally.Various application fields of stretchable magnetoelectronics are proposed and realized throughout this work. The developed sensor platform can equip soft electronic systems with navigation, orientation, motion tracking and touchless control capabilities. A variety of novel technologies, like smart textiles, soft robotics and actuators, active medical implants and soft consumer electronics will benefit from these new magnetic functionalities. Michael Melzer: Stretchable MagnetoelectronicsOutline 4

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Section: Stretchable Spin Valvesmentioning

confidence: 99%

Section: Electrical Contacting Of Stretchable Sensor Devicesmentioning

confidence: 99%

Section: Gmr Layer Stacksmentioning

confidence: 99%

Section: Gmr Layer Stacksmentioning

confidence: 99%

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Stretchable Magnetoelectronics

et al. 2011

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“…All these tasks are typically solved by means of magnetic field sensorics. In this respect, the smart combination of metallic thin films deposited directly on polymeric supports allowed to fabricate flexible Hall sensors 11 as well as flexible and even stretchable magnetoelectronics relying on the giant magnetoresistance (GMR) effect in multilayers [12][13][14] and spin valves 15,16 or on the tunnel magnetoresistance in magnetic tunnel junctions. 17,18 These flexible devices are already successfully integrated in fluidic systems, 19 applied as pointing devices and proximity sensorics 11,20 and act as components of printed electronics.…”

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confidence: 99%

High-performance giant magnetoresistive sensorics on flexible Si membranes

Pérez

Melzer

Makarov

et al. 2015

Applied Physics Letters

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We fabricate high-performance giant magnetoresistive (GMR) sensorics on Si wafers, which are subsequently thinned down to 100 mu m or 50 mu m to realize mechanically flexible sensing elements. The performance of the GMR sensors upon bending is determined by the thickness of the Si membrane. Thus, bending radii down to 15.5mm and 6.8mm are achieved for the devices on 100 mu m and 50 mu m Si supports, respectively. The GMR magnitude remains unchanged at the level of (15.3 +/- 0.4)% independent of the support thickness and bending radius. However, a progressive broadening of the GMR curve is observed associated with the magnetostriction of the containing Ni81Fe19 alloy, which is induced by the tensile bending strain generated on the surface of the Si membrane. An effective magnetostriction value of lambda(s) = 1.7 x 10(-6) is estimated for the GMR stack. Cyclic bending experiments showed excellent reproducibility of the GMR curves during 100 bending cycles

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Magnetic Nanomembranes

Yan

Ouyang

et al. 2022

Nanomembranes

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Stretchable Spin Valves on Elastomer Membranes by Predetermined Periodic Fracture and Random Wrinkling

Cited by 93 publications

References 31 publications

Stretchable Magnetoelectronics

Stretchable Magnetoelectronics

High-performance giant magnetoresistive sensorics on flexible Si membranes

Magnetic Nanomembranes

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