Submicrometer Ferromagnetic NOT Gate and Shift Register

Allwood, D. A.; Xiong, Gang; Cooke, Mary; Faulkner, Colm C.; Atkinson, D.; Vernier, N.; Cowburn, R. P.

doi:10.1126/science.1070595

Cited by 557 publications

(300 citation statements)

References 19 publications

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“…This effect is of interest for the development of novel memory and logic devices based on domain-wall propagation (Allwood et al, 2002). A combination of Lorentz TEM and electron holography can be used to study the motion of magnetic domain walls induced by currents (Junginger et al, 2007) by using an electrical biasing TEM specimen holder, as described above.…”

Section: Current-induced Motion Of Magnetic Domain Walls In Permalloymentioning

confidence: 99%

Electron Holography of Magnetic Materials

Kasama¹,

Dunin‐Borkowski²,

Beleggia³

2011

Holography - Different Fields of Application

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Section: Current-induced Motion Of Magnetic Domain Walls In Permalloymentioning

confidence: 99%

Electron Holography of Magnetic Materials

Kasama¹,

Dunin‐Borkowski²,

Beleggia³

2011

Holography - Different Fields of Application

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“…More complex magnetic nanowire networks containing wire junctions can be used to perform logic operations [4,5]. In these structures, DWs are driven by a global rotating in-plane magnetic field that moves DWs around corners of the same handedness as the field rotation direction.…”

Section: Current Applicationsmentioning

confidence: 99%

“…More sophisticated methods of introducing DWs selectively have since been introduced, including heat-assisted nucleation [15] and using the Oersted field from an overlaid current-carrying wire [2,3,16]. DWs propagated under applied magnetic fields could then be positioned at deliberate edge defects [16][17][18][19], wire junctions [20,21], 90 • wire corners [4,5,22] or regions of changing wire width [23]. The use of geometrical features to control the DW position is complicated by the magnetic interactions, often depending on the DW structure and its propagation direction [9,19,20,24,25].…”

Section: Basic Observationsmentioning

confidence: 99%

“…The ability to modify the functionality of a nanowire system simply by changing local geometry or anisotropy using standard lithographic techniques gives the technology a great deal of flexibility. There has been particular focus on information storage [1][2][3] and logic [4,5] devices operated by magnetic DWs in nanowires. This is partly because the nanowires generally have a twofold degeneracy resulting from a single magnetic easy axis, which is ideal for representing digital information.…”

Section: Introductionmentioning

confidence: 99%

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Nanowire spintronics for storage class memories and logic

Hrkac

Dean

Allwood

2011

Phil. Trans. R. Soc. A.

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Patterned magnetic nanowires are extremely well suited for data storage and logic devices. They offer non-volatile storage, fast switching times, efficient operation and a bistable magnetic configuration that are convenient for representing digital information. Key to this is the high level of control that is possible over the position and behaviour of domain walls (DWs) in magnetic nanowires. Magnetic random access memory based on the propagation of DWs in nanowires has been released commercially, while more dynamic shift register memory and logic circuits have been demonstrated. Here, we discuss the present standing of this technology as well as reviewing some of the basic DW effects that have been observed and the underlying physics of DW motion. We also discuss the future direction of magnetic nanowire technology to look at possible developments, hurdles to overcome and what nanowire devices may appear in the future, both in classical information technology and beyond into quantum computation and biology.

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“…This diversity could be used in magnetic storage technologies in order to encode information or to perform logic operations (see [2,5,16,28]). …”

Section: Introductionmentioning

confidence: 99%

Control and stabilization of steady-states in a finite-length ferromagnetic nanowire

Privat

Trélat

2015

ESAIM: COCV

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We consider a finite-length ferromagnetic nanowire, in which the evolution of the magnetization vector is governed by the Landau-Lishitz equation. We first compute all steady-states of this equation, and prove that they share a quantization property in terms of a certain energy. We study their local stability properties. Then we address the problem of controlling and stabilizing steady-states by means of an external magnetic field induced by a solenoid rolling around the nanowire. We prove that, for a generic placement of the solenoid, any steady-state can be locally exponentially stabilized with a feedback control. Moreover we design this feedback control in an explicit way by considering a finite-dimensional linear control system resulting from a spectral analysis. Finally, we prove that we can steer approximately the system from any steady-state to any other one, provided that they have the same energy level.

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Submicrometer Ferromagnetic NOT Gate and Shift Register

Cited by 557 publications

References 19 publications

Electron Holography of Magnetic Materials

Electron Holography of Magnetic Materials

Nanowire spintronics for storage class memories and logic

Control and stabilization of steady-states in a finite-length ferromagnetic nanowire

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