Applications of microelectromagnetic traps

Basore, Joseph R.; Baker, Lane A.

doi:10.1007/s00216-012-6040-5

Cited by 18 publications

(16 citation statements)

References 71 publications

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“…Moreover, the chemical control is typically nonvolatile in nature; this implies that the altered magnetic states can be retained without an electrical power supply. Consequently, besides magnetic storage, such a system may also work as microelectromagnets, not requiring continuous supply of currents to maintain the desired magnetic states . In addition, as it will be shown in the present study, the chemical control of magnetism can also be pertinent to insulator magnets, i.e., magnetic systems without itinerant electronic charge carriers.…”

Section: Introductionmentioning

confidence: 69%

Toward On‐and‐Off Magnetism: Reversible Electrochemistry to Control Magnetic Phase Transitions in Spinel Ferrites

Dasgupta

Das

et al. 2016

Adv Funct Materials

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The magnetoelectric effect, i.e., electric-fi eld control of magnetism in artifi cial heterostructures is usually limited to surface/interface atoms of the magnetic materials. In order to attain electrical control of magnetism in bulk ferromagnets, this study proposes to extend the defi nition of magnetoelectric phenomena to include reversible, chemistry-controlled magnetization switching. A large and reversible change in the room temperature magnetization in strong ferromagnets is reported, with electrochemistry-driven Li-ion exchange; carefully chosen spinel ferrites demonstrate a reversible magnetization variation up to 50% for CuFe 2 O 4 and 70% for ZnFe 2 O 4 . In case of CuFe 2 O 4 , the magnetization variation is predominantly associated with the preferential reduction of Cu 2+ to Cu + ions, and, hence, abides a nearly one-to-one relationship with the amount of injected Li-ions. In addition, the reduction of Cu 2+ also annihilates the Fe 3+  O  Cu 2+ magnetic interaction, resulting in a marked decrease in the Neél temperature of CuFe 2 O 4 . In contrast, the electrical tuning of superexchange interactions is found to play the decisive role in ZnFe 2 O 4 , where the simple electrochemical reduction model of magnetic cations can only explain a nominal fraction of the total magnetization variation, and indeed an electrochemically controlled reversible change in transition temperature is found necessary to account for the large magnetization variation observed.

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Section: Introductionmentioning

confidence: 69%

Toward On‐and‐Off Magnetism: Reversible Electrochemistry to Control Magnetic Phase Transitions in Spinel Ferrites

Dasgupta

Das

et al. 2016

Adv Funct Materials

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“…to enhance Li (or other) ion diffusivity would be of interest to gain faster magnetic switching. As an example of potential device, intercalation‐driven electromagnetic actuators (e.g., in microfluidics or micro‐ (macro) robotics, may replace the standard micro‐electromagnets as an easy‐to‐fabricate and energy‐efficient alternative, not requiring a continuous power supply. On a more speculative level, one may aim to realize arrays of such switchable magnets by using roll‐to‐roll printing technologies.…”

Section: Summary Of the Fitted Mössbauer Data (Shown In Figure ) Of Tmentioning

confidence: 99%

Intercalation‐Driven Reversible Control of Magnetism in Bulk Ferromagnets

et al. 2014

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An extension in magnetoelectric effects is proposed to include reversible chemistry-controlled magnetization variations. This ion-intercalation-driven magnetic control can be fully reversible and pertinent to bulk material volumes. The concept is demonstrated for ferromagnetic iron oxide where the intercalated lithium ions cause valence change and partial redistribution of Fe(3+) cations yielding a large and fully reversible change in magnetization at room temperature.

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“…Instead of using magnetic field gradient and field strength both generated by micro magnets, two embedded micro magnets developed by Suzuki et al [30] in the microfluidic system are used to generate a static gradient magnetic field, and macro-sized external electromagnets are used to generate an alternating uniform magnetic field. A distinctive feature of the micro magnet system is that it can produce a high magnetic field gradient, yet a relatively low magnetic field [28,37]. And thus the strength of magnetic force produced by micro electromagnets has been limited.…”

Section: Introductionmentioning

confidence: 99%

An active microfluidic mixer utilizing a hybrid gradient magnetic field

Cao

Han

2015

International Journal of Applied Electromagnetics and Mechanics

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A simple active microfluidic mixing system based on magnetic actuation strategy of fluids in the microchannel under a hybrid gradient magnetic field was proposed. The hybrid magnetic field, combined of a static gradient magnetic field and an external AC uniform magnetic field, is specially designed to generate periodic magnetic body forces acting on the mixed fluids. Two-dimensional numerical simulation has been performed to investigate the mixing behavior caused by the interactions of magnetic field, fluid flow and convection-diffusion. Numerical results show that the proposed mixer system achieved up to 97% mixing of the two fluids with a small current flowing in micromagnets.

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Applications of microelectromagnetic traps

Cited by 18 publications

References 71 publications

Toward On‐and‐Off Magnetism: Reversible Electrochemistry to Control Magnetic Phase Transitions in Spinel Ferrites

Toward On‐and‐Off Magnetism: Reversible Electrochemistry to Control Magnetic Phase Transitions in Spinel Ferrites

Intercalation‐Driven Reversible Control of Magnetism in Bulk Ferromagnets

An active microfluidic mixer utilizing a hybrid gradient magnetic field

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