Domain-wall and reverse-domain superconducting states of a Pb thin-film bridge on a ferromagnetic BaFe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>12</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>19</mml:mn></mml:msub></mml:math>single crystal

Werner, R.; Aladyshkin, A. Yu.; Guénon, Stefan; Fritzsche, Joachim; Nefedov, I. M.; Moshchalkov, Victor; Kleiner, R.; Koelle, D.

doi:10.1103/physrevb.84.020505

Cited by 20 publications

(16 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous investigations of planar F/S hybrid structures focused on transport measurements 3 4 5 6 7 , vortex imaging 8 9 , F/S junctions 10 or the visualization of reverse domain wall superconductivity by scanning laser microscopy with a spatial resolution of micrometres 11 12 . Here, we present low temperature scanning tunnelling microscopy (STM) and spectroscopy measurements focused on the direct visualization of the nucleation of superconductivity on the length scale of the superconducting coherence length.…”

mentioning

confidence: 99%

Visualizing domain wall and reverse domain superconductivity

et al. 2014

View full text Add to dashboard Cite

In magnetically coupled, planar ferromagnet-superconductor (F/S) hybrid structures, magnetic domain walls can be used to spatially confine the superconductivity. In contrast to a superconductor in a uniform applied magnetic field, the nucleation of the superconducting order parameter in F/S structures is governed by the inhomogeneous magnetic field distribution. The interplay between the superconductivity localized at the domain walls and far from the walls leads to effects such as re-entrant superconductivity and reverse domain superconductivity with the critical temperature depending upon the location. Here we use scanning tunnelling spectroscopy to directly image the nucleation of superconductivity at the domain wall in F/S structures realized with Co-Pd multilayers and Pb thin films. Our results demonstrate that such F/S structures are attractive model systems that offer the possibility to control the strength and the location of the superconducting nucleus by applying an external magnetic field, potentially useful to guide vortices for computing application.

show abstract

mentioning

confidence: 99%

Visualizing domain wall and reverse domain superconductivity

et al. 2014

View full text Add to dashboard Cite

show abstract

“…We would like to mention that the DWS state was observed for a similar Pb bridge oriented along the domain wall using the same LTSLM technique. 46 V. CONCLUSION…”

Section: Visualization Of Nonuniform Superconducting States By Scanni...mentioning

confidence: 98%

Crossover between different regimes of inhomogeneous superconductivity in planar superconductor-ferromagnet hybrids

et al. 2011

Self Cite

View full text Add to dashboard Cite

11 pages, 12 figuresInternational audienceWe studied experimentally the effect of a stripe-like domain structure in a ferromagnetic BaFe_{12}O_{19} substrate on the magnetoresistance of a superconducting Pb microbridge. The system was designed in such a way that the bridge is oriented perpendicular to the domain walls. It is demonstrated that depending on the ratio between the amplitude of the nonuniform magnetic field B_0, induced by the ferromagnet, and the upper critical field H_{c2} of the superconducting material, the regions of the reverse-domain superconductivity in the H-T plane can be isolated or can overlap (H is the external magnetic field, T is temperature). The latter case corresponds to the condition B_0/H_{c2}<1 and results in the formation of superconductivity above the magnetic domains of both polarities. We discovered the regime of edge-assisted reverse-domain superconductivity, corresponding to localized superconductivity near the edges of the bridge above the compensated magnetic domains. Direct verification of the formation of inhomogeneous superconducting states and external-field-controlled switching between normal state and inhomogeneous superconductivity were obtained by low-temperature scanning laser microscopy

show abstract

“…For a superconductor-ferromagnet hybrid, where a superconducting film is deposited on top of a ferromagnetic substrate, the magnetic landscape within the superconducting film that is generated by the ferromagnetic substrate modifies the nucleation of superconductivity. This can lead to reverse-domain and domain-wall superconductivity, which has been imaged by LTSLM 81,82 . The polar MOKE (θ polar K ) image is shown in Fig.…”

Section: A Magnetic Domains In Barium Hexaferritementioning

confidence: 99%

A high-resolution combined scanning laser and widefield polarizing microscope for imaging at temperatures from 4 K to 300 K

Lange¹,

Guénon²,

Lever³

et al. 2017

Review of Scientific Instruments

Self Cite

View full text Add to dashboard Cite

Polarized light microscopy, as a contrast-enhancing technique for optically anisotropic materials, is a method well suited for the investigation of a wide variety of effects in solid-state physics, as for example birefringence in crystals or the magneto-optical Kerr effect (MOKE). We present a microscopy setup that combines a widefield microscope and a confocal scanning laser microscope with polarization-sensitive detectors. By using a high numerical aperture objective, a spatial resolution of about 240 nm at a wavelength of 405 nm is achieved. The sample is mounted on a 4 He continuous flow cryostat providing a temperature range between 4 K and 300 K, and electromagnets are used to apply magnetic fields of up to 800 mT with variable in-plane orientation and 20 mT with out-of-plane orientation. Typical applications of the polarizing microscope are the imaging of the in-plane and out-of-plane magnetization via the longitudinal and polar MOKE, imaging of magnetic flux structures in superconductors covered with a magneto-optical indicator film via Faraday effect or imaging of structural features, such as twin-walls in tetragonal SrTiO 3 . The scanning laser microscope furthermore offers the possibility to gain local information on electric transport properties of a sample by detecting the beam-induced voltage change across a current-biased sample. This combination of magnetic, structural and electric imaging capabilities makes the microscope a viable tool for research in the fields of oxide electronics, spintronics, magnetism and superconductivity.

show abstract

Domain-wall and reverse-domain superconducting states of a Pb thin-film bridge on a ferromagnetic BaFe12O19single crystal

Cited by 20 publications

References 23 publications

Visualizing domain wall and reverse domain superconductivity

Visualizing domain wall and reverse domain superconductivity

Crossover between different regimes of inhomogeneous superconductivity in planar superconductor-ferromagnet hybrids

A high-resolution combined scanning laser and widefield polarizing microscope for imaging at temperatures from 4 K to 300 K

Contact Info

Product

Resources

About