Magnetic Bubble Memory and Logic

Chen, Tien Chi; Chang, H.

doi:10.1016/s0065-2458(08)60393-9

Cited by 18 publications

(8 citation statements)

References 32 publications

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“…We assume that permalloy (i.e., Ni 80 Fe 20 ) is a soft magnetic material such that its magnetization is synched with the external rotating magnetic field. A magnetic bar in an in-plane magnetic field along its long axis behaves as an induced magnet with two poles on their ends [30]. The same behavior is seen when a magnetic disk is exposed to an in-plane magnetic field.…”

Section: Resultsmentioning

confidence: 75%

Controlled Transport of Magnetic Particles and Cells Using C-Shaped Magnetic Thin Films in Microfluidic Chips

Abedini-Nassab

Emamgholizadeh

2022

Micromachines

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Single-cell analysis is an emerging discipline that has shown a transformative impact in cell biology in the last decade. Progress in this field requires systems capable of accurately moving the cells and particles in a controlled manner. Here, we present a microfluidic platform equipped with C-shaped magnetic thin films to precisely transport magnetic particles in a tri-axial rotating magnetic field. This innovative system, compared to the other rivals, offers numerous advantages. The magnetic particles repel each other to prevent undesired cluster formation. Many particles move synced with the external rotating magnetic field, which results in highly parallel controlled particle transport. We show that the particle transport in this system is analogous to electron transport and Ohm’s law in electrical circuits. The proposed magnetic transport pattern is carefully studied using both simulations and experiments for various parameters, including the magnetic field characteristics, particle size, and gap size in the design. We demonstrate the appropriate transport of both magnetic beads and magnetized living cells. We also show a pilot mRNA-capturing experiment with barcode-carrying magnetic beads. The introduced chip offers fundamental potential applications in the fields of single-cell biology and bioengineering.

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Section: Resultsmentioning

confidence: 75%

Controlled Transport of Magnetic Particles and Cells Using C-Shaped Magnetic Thin Films in Microfluidic Chips

Abedini-Nassab

Emamgholizadeh

2022

Micromachines

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“…DW-based logic architectures capable of performing Boolean logic operations have been developed in parallel to DW memory devices [1,[17][18][19][20][21]. In 2005, Allwood et al demonstrated elementary logic operations using DWs in magnetic circuits with in-plane magnetization by applying a rotating magnetic field [18,19].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, spin-orbit torques (SOTs) arising from the spin Hall and Rashba-Edelstein effects prove to be an effective way to drive DW motion with an electric current [16]. DW-based logic architectures capable of performing Boolean logic operations have been developed in parallel to DW memory devices [1,[17][18][19][20][21]. In 2005, Allwood et al demonstrated elementary logic operations using DWs in magnetic circuits with in-plane magnetization by applying a rotating magnetic field [18,19].…”

Section: Introductionmentioning

confidence: 99%

Field- and Current-Driven Magnetic Domain-Wall Inverter and Diode

et al. 2021

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“…[3][4][5][6][7][8][9][10] Generally, the topological protection makes the lifetime of these nontrivial quasiparticles much longer than that of topologically trivial particles. Magnetic bubbles, [11][12][13] domain walls, 14,15 magnetic vortices, [16][17][18][19][20] and skyrmions [6][7][8][9]21 are typically static topological solitons and have been well studied. Differing from these static structures, the dissipative magnetic droplet soliton (droplet hereafter) is non-topological, inherently dynamic, and results from the balance between anisotropy, exchange, spin transfer torque, and magnetic damping.…”

mentioning

confidence: 99%

Merging droplets in double nanocontact spin torque oscillators

et al. 2016

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We demonstrate how magnetic droplet soliton pairs, nucleated by two separated nano-contact (NC) spin torque oscillators, can merge into a single droplet soliton. A detailed description of the magnetization dynamics of this merger process is obtained by micromagnetic simulations: A droplet pair with a steady-state in-phase spin precession is generated through the spin-transfer torque effect underneath two separate NCs, followed by a gradual expansion of the droplets volume and the out phase of magnetization on the inner side of the two droplets, resulting in the droplets merging into a larger droplet. This merger occurs only when the NC separation is smaller than a critical value. A transient breathing mode is observed before the merged droplet stabilizes into a steady precession state. The precession frequency of the merged droplet is lower than that of the droplet pair, consistent with its larger size. Merged droplets can again break up into droplet pairs at high enough magnetic field with a strong hysteretic response. PACS number(s): 75.78.Fg, 75.70.Kw, 75.78.Cd

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Magnetic Bubble Memory and Logic

Cited by 18 publications

References 32 publications

Controlled Transport of Magnetic Particles and Cells Using C-Shaped Magnetic Thin Films in Microfluidic Chips

Controlled Transport of Magnetic Particles and Cells Using C-Shaped Magnetic Thin Films in Microfluidic Chips

Field- and Current-Driven Magnetic Domain-Wall Inverter and Diode

Merging droplets in double nanocontact spin torque oscillators

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