Magnetic-assisted self-assembly of rectangular-shaped parts

Wang, Dung-An; Ko, Hong-Hua

doi:10.1016/j.sna.2009.02.033

Cited by 11 publications

(6 citation statements)

References 22 publications

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“…(iii) Low-frequency ME voltage coefficient : Next, we discuss magnetic field assisted assembly (MFAA) of the fibers into planar films for ME voltage coefficient measurements. Two types of assembly were done: (i) in a uniform field produced by a solenoid or an electromagnet that is expected to align them along the field direction and (ii) a non-uniform field produced by a permanent magnet that will exert an attractive force on the fibers and move them toward regions of high field strength [ 39 , 40 , 41 ]. Fibers were mixed with a solvent and dispersed on a glass slide.…”

Section: Resultsmentioning

confidence: 99%

Multiferroic Core-Shell Nanofibers, Assembly in a Magnetic Field, and Studies on Magneto-Electric Interactions

Sreenivasulu

Zhang

et al. 2017

Materials

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Ferromagnetic–ferroelectric nanocomposites are of interest for realizing strong strain-mediated coupling between electric and magnetic subsystems due to a high surface area-to-volume ratio. This report is on the synthesis of nickel ferrite (NFO)–barium titanate (BTO) core–shell nanofibers, magnetic field assisted assembly into superstructures, and studies on magneto-electric (ME) interactions. Electrospinning techniques were used to prepare coaxial fibers of 0.5–1.5 micron in diameter. The core–shell structure of annealed fibers was confirmed by electron microscopy and scanning probe microscopy. The fibers were assembled into discs and films in a uniform magnetic field or in a field gradient. Studies on ME coupling in the assembled films and discs were done by magnetic field (H)-induced polarization, magneto–dielectric effects at low frequencies and at 16–24 GHz, and low-frequency ME voltage coefficients (MEVC). We measured ~2–7% change in remnant polarization and in the permittivity for H = 7 kOe, and a MEVC of 0.4 mV/cm Oe at 30 Hz. A model has been developed for low-frequency ME effects in an assembly of fibers and takes into account dipole–dipole interactions between the fibers and fiber discontinuity. Theoretical estimates for the low-frequency MEVC have been compared with the data. These results indicate strong ME coupling in superstructures of the core–shell fibers.

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Section: Resultsmentioning

confidence: 99%

Multiferroic Core-Shell Nanofibers, Assembly in a Magnetic Field, and Studies on Magneto-Electric Interactions

Sreenivasulu

Zhang

et al. 2017

Materials

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“…Magnetic forces have been used by several researchers to assemble parts at magnetized template sites [53][54][55][56] while others focused on assembly of magnetized parts [56,57]. External fields were used to manipulate ferromagnetic parts [58][59][60] as well. As underscored in [61], the underlying principle involving the use of magnetic forces for selfassembly was due to the expected 1/r 4 force law, where r represents the distance between two identical magnetic dipoles.…”

Section: Self-assembly Techniques In Micro-devicesmentioning

confidence: 99%

“…Iwase [60], Wang [61], Grzybowski (2010) • External magnetic fields • Manipulation of ferromagnetic parts Saeedi et al [52] • Discussion of fundamental aspects of self-assembly process • Discussion of selection of appropriate alloy…”

Section: Self-assembly Techniques In Micro-devicesmentioning

confidence: 99%

A review of micro-devices assembly techniques and technology

Cecil

Kumar

Lü

et al. 2015

Int J Adv Manuf Technol

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This paper provides a review of techniques and technology relevant to the field of micro-devices assembly (MDA). MDA is an emerging domain of importance which is expected to have a substantial impact on a range of industrial fields including sensors, surveillance devices, and semiconductor devices. This paper provides a review of a cross-section of research including micro-gripping design and manipulation techniques, work cell design and factory automation, selfassembly techniques, and virtual reality-based approaches in micro-assembly. A discussion of the key challenges for this domain along with directions for future research is also provided.

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“…Magnetic forces are also useful to assemble parts at magnetized template sites [24][25][26][27], to manipulate ferromagnetic parts by external fields [28][29][30], and to assemble magnetized parts with one another [27,31]. One aspect that makes magnetic forces attractive for self-assembly is the expected 1/r 4 force law, where r represents the distance between two identical magnetic dipoles.…”

Section: Open Accessmentioning

confidence: 99%

Self-Assembly of Microscale Parts through Magnetic and Capillary Interactions

et al. 2011

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Self-assembly is a promising technique to overcome fundamental limitations with integrating, packaging, and general handling of individual electronic-related components with characteristic lengths significantly smaller than 1 mm. Here we describe the use of magnetic and capillary forces to self-assemble 280 µm sized silicon building blocks into interconnected structures which approach a three-dimensional crystalline configuration. Integrated permanent magnet microstructures provided magnetic forces, while a low-melting-point solder alloy provided capillary forces. A finite element model of forces between the magnetic features demonstrated the utility of magnetic forces at this size scale. Despite a slight departure from designed dimensions in the actual fabricated parts, the combination of magnetic and capillary forces improved the assembly yield to 8%, over approximately 0.1% achieved previously with capillary forces alone.

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Magnetic-assisted self-assembly of rectangular-shaped parts

Cited by 11 publications

References 22 publications

Multiferroic Core-Shell Nanofibers, Assembly in a Magnetic Field, and Studies on Magneto-Electric Interactions

Multiferroic Core-Shell Nanofibers, Assembly in a Magnetic Field, and Studies on Magneto-Electric Interactions

A review of micro-devices assembly techniques and technology

Self-Assembly of Microscale Parts through Magnetic and Capillary Interactions

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