Real-time scanning Hall probe microscopy

Oral, Ahmet; Bending, Simon; Henini, M.

doi:10.1063/1.117582

Cited by 254 publications

(152 citation statements)

References 5 publications

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“…High resolution scanning Hall microscopy (SHM) [10] has been used to directly image the stray fields at the surface of our multilayer samples at various temperatures down to 4.5K. Our microscope employs a custom-fabricated GaAs chip attached to the end of a piezoelectric scanner tube.…”

Section: Experimental Methodsmentioning

confidence: 99%

Continuously tuneable critical current in superconductor-ferromagnet multilayers

Curran

Kim

Satchell

et al. 2017

Applied Physics Letters

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We demonstrate that the critical current of superconducting Nb/Ni multilayers can be continuously tuned by up to a factor of three during magnetization reversal of the Ni films under an applied in-plane magnetic field. Our observations are in reasonably good agreement with a model of vortex pinning by Bloch domain walls that proliferate in the samples during magnetization reversal, whereby each vortex interacts with at most one wall in any of the Ni layers. Our model suggests ways in which the controllable pinning effect could be significantly enhanced, with important potential applications in tuneable superconducting devices.

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Section: Experimental Methodsmentioning

confidence: 99%

Continuously tuneable critical current in superconductor-ferromagnet multilayers

Curran

Kim

Satchell

et al. 2017

Applied Physics Letters

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“…The Hall probe makes an angle of about 1°with the sample plane so that the STM tip is always the closest point to the surface, and the Hall sensor was about 300-400 nm above the sample in the images shown here. A more detailed description of the instrument is given elsewhere [17].…”

Section: Experimental Methodsmentioning

confidence: 99%

Driving force for commensurate vortex domain formation in periodic pinning arrays

Bending

Grigorenko

Bael

et al. 2004

Physica C: Superconductivity

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Recent vortex images in periodic pinning arrays have revealed the formation of degenerate commensurate domains separated by domain walls near rational fractional filling. This phenomenon was entirely unanticipated since, in stark contrast to ferromagnetic materials, the energies and magnetisation of different domains are identical, and the driving force for domain formation and estimation of typical domain sizes has, until now, remained an unsolved problem. We use high-resolution scanning Hall probe microscopy to show that domain formation is driven by the efficient incorporation of mismatched excess vortices/vacancies at the corners of domain walls. Molecular dynamics simulations with a generic pinning potential reveal that domains are only formed when vortex-vortex interactions are long range. A semi-quantitative model of domain formation further discloses how domain sizes depend on both the pinning array period and effective penetration depth.

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“…1 It has been used for investigating many magnetic phenomena in physics and material science using advantage of high magnetic field sensitivity 2 and spatial resolutions down to 50 nm 3 in a broad temperature range and high magnetic field. It is possible to image both conducting and insulating specimens using scanning tunneling microscope (STM) and atomic force microscope (AFM) feedback mechanisms, 4 respectively.…”

Section: Introductionmentioning

confidence: 99%

An ultra-low temperature scanning Hall probe microscope for magnetic imaging below 40 mK

Karcı

Piatek

Jorba

et al. 2014

Review of Scientific Instruments

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We describe the design of a low temperature scanning Hall probe microscope (SHPM) for a dilution refrigerator system. A detachable SHPM head with 25.4 mm OD and 200 mm length is integrated at the end of the mixing chamber base plate of the dilution refrigerator insert (Oxford Instruments, Kelvinox MX−400) by means of a dedicated docking station. It is also possible to use this detachable SHPM head with a variable temperature insert (VTI) for 2 K–300 K operations. A microfabricated 1μm size Hall sensor (GaAs/AlGaAs) with integrated scanning tunneling microscopy tip was used for magnetic imaging. The field sensitivity of the Hall sensor was better than 1 mG/√Hz at 1 kHz bandwidth at 4 K. Both the domain structure and topography of LiHoF4, which is a transverse-field Ising model ferromagnet which orders below TC = 1.53 K, were imaged simultaneously below 40 mK.

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Real-time scanning Hall probe microscopy

Cited by 254 publications

References 5 publications

Continuously tuneable critical current in superconductor-ferromagnet multilayers

Continuously tuneable critical current in superconductor-ferromagnet multilayers

Driving force for commensurate vortex domain formation in periodic pinning arrays

An ultra-low temperature scanning Hall probe microscope for magnetic imaging below 40 mK

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