Novel Approach to Control Diameter of Self-Rolled Magnetic Microtubes by Anodizing Ti Layer

Min, Seong-Gi; Gaffney, John; Eskandari, Rahmatollah; Tripathy, Jagnyaseni; Lim, Jin-Hee; Małkiński, L.

doi:10.1109/lmag.2012.2213074

Cited by 1 publication

(3 citation statements)

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“…The results of the experiment, displayed in Figure 5, show that the stresses from Ti layer, converted into TiO, reduced the diameter of the tubes to about a half of its original value. It was estimated that the strain associated with the oxidation was about 1% [48]. An interesting approach would be to design processes in which magnetic metals such as Ni or Fe are chemically altered into magnetic compounds such as antiferromagnetic NiO or magnetite (Fe 3 O 4 ).…”

Section: Other Useful Forcesmentioning

confidence: 99%

“…The films fabricated in our group [48,53,54] were isotropic in the film plane. Therefore, the effect of the self-rolling on the static magnetic properties was easier to interpret than for the anisotropic films.…”

Section: Link Between the Shape And Magnetic Propertiesmentioning

confidence: 99%

“…[48], the behavior of the GaFe films could be interpreted in terms of the shape anisotropy of the microtubes for which the technical magnetization saturation is achieved at lower fields for the field applied along the easy magnetization axis (along the tubes), whereas the loops for the hard direction (perpendicular to the tubes) are tilted and approach saturation magnetization at higher fields. However, the behavior of Ni tubes opposes that of GaFe, in spite of similar contribution from the shape anisotropy.…”

Section: Link Between the Shape And Magnetic Propertiesmentioning

confidence: 99%

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Magnetic Micro-Origami

Małkiński¹,

Eskandari²

2016

Magnetic Materials

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Microscopic origami figures can be created from thin film patterns using surface tension of liquids or residual stresses in thin films. The curvature of the structures, direction of bending, twisting, and folding of the patterns can be controlled by their shape, thickness, and elastic properties and by the strength of the residual stresses. Magnetic materials used for micro-and nano-origami structures play an essential role in many applications. Magnetic force due to applied magnetic field can be used for remote actuation of microrobots. It can also be used in targeted drug delivery to direct cages loaded with drugs or microswimmers to transport drugs to specific organs. Magnetoelastic properties of free-standing micro-origami patterns can serve for stress or magnetic field sensing. Also, the stress-induced anisotropy and magnetic shape anisotropy provide a convenient method of tuning magnetic properties by designing a shape of the microorigami figures instead of varying the composition of the films. Micro-origami figures can also serve as building blocks for two-and three-dimensional meta-materials with unique properties such as negative index of refraction. Micro-origami techniques provide a powerful method of self-assembly of magnetic circuits and integrating them with microelectro-mechanical systems or other functional devices.

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Section: Other Useful Forcesmentioning

confidence: 99%

Section: Link Between the Shape And Magnetic Propertiesmentioning

confidence: 99%

Section: Link Between the Shape And Magnetic Propertiesmentioning

confidence: 99%

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