A simple model for calculating magnetic nanowire domain wall fringing fields

West, Adam; Hayward, Thomas J.; Weatherill, Kevin J.; Schrefl, T.; Allwood, D. A.; Hughes, Ifan G.

doi:10.1088/0022-3727/45/9/095002

Cited by 8 publications

(11 citation statements)

References 22 publications

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“…[32] The optical working distances and nonreflective nature of MPL imaging may even allow magnetization structure of rough surfaces or the surface of 3D objects [44] to be resolved. The fields from magnetic features such as domain walls in soft magnetic nanowires are of an appropriate magnitude for MPL detection [45,46] and imaging could be extended to microscopic length-scales. The luminescent nature of singlet exciton fission-based magnetic microscopy means that it may be possible to employ stimulated emission-depletion microscopy approaches to achieve subdiffraction limit resolution.…”

Section: Resultsmentioning

confidence: 99%

Wide Field Magnetic Luminescence Imaging

Hodges

Grell

Morley

et al. 2017

Adv Funct Materials

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This study demonstrates how magnetic-field-dependent luminescence from organic films can be used to image the magnetic configuration of an underlying sample. The organic semiconductors tetracene and rubrene exhibit singlet exciton fission, which is a process sensitive to magnetic fields. Here, thin films of these materials were characterized using photoluminescence spectrometry, atomic force microscopy, and photoluminescence magnetometry. The luminescence from these substrate-bound thin films is imaged to reveal the magnetic configuration of underlying Nd-Fe-B magnets. The tendency of rubrene to form amorphous films and produce large changes in photoluminescence under an applied magnetic field makes it more appropriate for magnetic field imaging than tetracene. This demonstration can be extended in the future to allow simple microscopic imaging of magnetic structure.

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Section: Resultsmentioning

confidence: 99%

Wide Field Magnetic Luminescence Imaging

Hodges

Grell

Morley

et al. 2017

Adv Funct Materials

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“…ω±, electron spin resonance frequencies; ms, spin quantum number. Panel a is adapted from 139,140 . superconductive vortexes are courtesy of www.superconductivity.eu.…”

Section: Introductionmentioning

confidence: 99%

Probing condensed matter physics with magnetometry based on nitrogen-vacancy centres in diamond

2018

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The magnetic fields generated by spins and currents provide a unique window into the physics of correlatedelectron materials and devices. Proposed only a decade ago, magnetometry based on the electron spin of nitrogen-vacancy (NV) defects in diamond is emerging as a platform that is excellently suited for probing condensed matter systems: it can be operated from cryogenic temperatures to above room temperature, has a dynamic range spanning from DC to GHz, and allows sensor-sample distances as small as a few nanometres. As such, NV magnetometry provides access to static and dynamic magnetic and electronic phenomena with nanoscale spatial resolution. Pioneering work focused on proof-of-principle demonstrations of its nanoscale imaging resolution and magnetic field sensitivity. Now, experiments are starting to probe the correlatedelectron physics of magnets and superconductors and to explore the current distributions in low-dimensional materials. In this Review, we discuss the application of NV magnetometry to the exploration of condensed matter physics, focusing on its use to study static and dynamic magnetic textures, and static and dynamic current distributions. Box 1| Measuring static fieldsHere we describe elementary considerations for the use of nitrogen-vacancy (NV) centres for imaging magnetic fields generated by static magnetic textures and current distributions. Reconstructing a vector magnetic field by measuring a single field componentBecause the NV electron spin resonance splitting is first-order sensitive to the projection of the magnetic field B on the NV spin quantization axis, B||, this is the quantity typically measured in an NV magnetometry measurement 16 . It is therefore convenient to realize that the full vector field B can be reconstructed by measuring any of its components in a plane positioned at a distance d from the sample, where d is the NV-sample distance (provided this component is not parallel to the measurement plane). This results from the linear dependence of the components of B̂ in Fourier space 24,25 , which follows from the fact that B can be expressed as the gradient of a scalar magnetostatic potential. Moreover, by measuring B||(x, y; z = d) we can reconstruct B at all distances d + h through the evanescent-field analogue of Huygens' principle, a procedure known as upward propagation 24 . As an example, the out-of-plane stray field component Bz(x, y; z = d + h) can be reconstructed from B||(x, y; z = d) using ̂( ; + ℎ) = − ℎ̂| | ( ; ) NV •

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“…Details of the design, manufacture and characterisation of the nanowire array can be found in 22 . Theoretical calculations of the DW fringing fields were performed using a simple analytical model described in 29 . The accuracy of the model was verified through comparison with proprietary code which solves the Landau-Lifshitz-Gilbert equation within a finite element/finite boundary framework 30 .…”

Section: Methods Summarymentioning

confidence: 99%

Realization of the Manipulation of Ultracold Atoms with a Reconfigurable Nanomagnetic System of Domain Walls

et al. 2012

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The divide between the realms of atomic-scale quantum particles and lithographically-defined nanostructures is rapidly being bridged. Hybrid quantum systems comprising ultracold gas-phase atoms and substrate-bound devices already offer exciting prospects for quantum sensors 1,2 , quantum information 3 and quantum control 4 . Ideally, such devices should be scalable, versatile and support quantum interactions with long coherence times. Fulfilling these criteria is extremely challenging as it demands a stable and tractable interface between two disparate regimes. Here we demonstrate an architecture for atomic control based on domain walls (DWs) in planar magnetic nanowires that provides a tunable atomic interaction, manifested experimentally as the reflection of ultracold atoms from a nanowire array. We exploit the magnetic reconfigurability of the nanowires to quickly and remotely tune the interaction with high reliability. This proof-of-principle study shows the practicability of more elaborate atom chips based on magnetic nanowires being used to perform atom optics on the nanometre scale.The position, internal state and interactions of quantum particles can be precisely controlled by a variety of techniques utilising combinations of electric, magnetic and optical fields 5,6 . These methods have been enhanced by exploiting the advances in modern nanofabrication techniques, giving rise to a wide array of miniaturised atom chip experiments 7 . Previous studies using micron-scale atom chips have demonstrated robust and exquisite control over atoms through increasingly complex networks of traps, guides and other atom-optical elements. Further miniaturisation of such devices to the nanoscale offers the tantalising prospect of the precise manipulation of the position and internal state of individual atoms.Magnetic atom chips can be roughly divided into devices based on current-carrying wires 8 and those based on permanent magnetic material 9 . Atom chips based on current-carrying wires can suffer from technical noise which induces spin-flip losses 10 and causes inhomogeneities in the magnetic potentials. Care must also be taken to ensure sufficient power dissipation, which can limit the precision of the fields created. On the other hand, lithographically fabricated permanent magnets far surpass the feature size limits of atom chips based on current-carrying wires 11-13 and offer greater flexibility of design, whilst allowing the creation of significantly stronger fields. This has enabled the creation of atom traps with exceptionally high trap frequencies [14][15][16] . However, permanent magnets suffer from the inability to be switched off or reconfigured once the device has been fabricated, limiting the realisation of dynamic behaviour.Here we demonstrate an atom chip based on nanomagnetic technology that exhibits the benefits of patterned magnetic materials whilst maintaining reconfigurability. The small characteristic size of our magnetic nanostructures provides exquisite control over the magnetic configuration and...

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A simple model for calculating magnetic nanowire domain wall fringing fields

Cited by 8 publications

References 22 publications

Wide Field Magnetic Luminescence Imaging

Wide Field Magnetic Luminescence Imaging

Probing condensed matter physics with magnetometry based on nitrogen-vacancy centres in diamond

Realization of the Manipulation of Ultracold Atoms with a Reconfigurable Nanomagnetic System of Domain Walls

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