Enhancement of proximity effects due to random roughness at a superconductor/metal interface

Palasantzas, G.

doi:10.1016/s0038-1098(99)00279-3

Cited by 4 publications

(5 citation statements)

References 17 publications

(29 reference statements)

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“…This hypothesis may be supported by theoretical and experimental studies in other groups [8][9][10]. Proximity effects depend on the penetration of electrons from the normal metal into the superconducting films.…”

Section: Possible Causesmentioning

confidence: 60%

Investigation of Surface Roughness Effect on Transition Edge Sensor Microcalorimeters Using Multilayer Readout Wiring

et al. 2016

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We are developing a transition edge sensor (TES) using multilayer readout wiring for future X-ray astronomy satellites. Although we fabricated a first full 20 × 20 pixels TES array, we could not confirm transition of the TES. Considering possible causes, we focused on surface roughness of the TES film. We checked the fabrication process steps that can influence the surface roughness step by step, and changed wiring material (Al to Nb) and also a process condition of an ion milling. As a result, we succeeded to reduce the surface roughness from 4.5 to 2.5 nm rms at 1 µm scale. However, the transition was not observed probably because the TES films in our samples with surface roughness more than ∼1 nm rms tend not to show the transition. Therefore, to suppress the surface roughness even more, we discuss possible process effects and mitigations.

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Section: Possible Causesmentioning

confidence: 60%

Investigation of Surface Roughness Effect on Transition Edge Sensor Microcalorimeters Using Multilayer Readout Wiring

et al. 2016

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“…From the study of relevant artificial structures of heterogeneous constituents, [1][2][3][4][5][6][7][8][9][10][11][12] it is well known that any effect occurring by the interface of layered hybrids has only limited range, thus penetrating at a length scale ranging between a few nanometers to a few tens of nanometers at the interior of each constituent layer. Following this guideline, for the FM/PE/FM hybrids studied here, the FM outer layers should have the lowest possible thickness since this will ensure that the part of the Co layers affected from the strain provided by the PE crystal will be the maximum.…”

Section: Resultsmentioning

confidence: 99%

“…As a consequence, a reduction of the SC critical temperature is observed that is noticeable only when the SC layer is quite thin, since it is inversely proportional to the square of its thickness. [10][11][12] Finally, an interesting class of hybrids that is intensively studied recently is the one composed of FM films adjacent to a piezoelectric (PE) substrate. [13][14][15][16][17][18][19] These hybrids have attracted the interest of researchers, since except for basic science they are promising for numerous devices and sensors, as for instance in magnetic recording for information storage.…”

Section: Introductionmentioning

confidence: 99%

Modulation of the properties of thin ferromagnetic films with an externally applied electric field in ferromagnetic/piezoelectric/ferromagnetic hybrids

Σταμόπουλος

Zeibekis

Zhang

2013

Journal of Applied Physics

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Modulation of the properties of thin ferromagnetic films with an externally applied electric field in ferromagnetic/piezoelectric/ferromagnetic hybrids AbstractIn many cases, technological advances are based on artificial low-dimensional structures of heterogeneous constituents, thus called hybrids, that when come together they provide stand-alone entities that exhibit entirely different properties. Such hybrids are nowadays intensively studied since they are attractive for both basic research and oncoming practical applications. Here, we studied hybrids constituted of piezoelectric (PE) and ferromagnetic (FM) components in the form FM/PE/FM, ultimately aiming to provide means for the controlled modulation of the properties of the FM electrodes, originating from the strain imposed to them by the PE mediator when an electric field is applied. The PE component is in single crystal form, 0.71Pb(Mg1/ 3Nb 2/3)O3-0.29PbTiO3 (PMN-PT), while the FM outer layers are Cobalt (Co) in thin film form. Detailed magnetization measurements performed under variation of the electric field applied to PMN-PT demonstrated the efficient modulation of the properties of the Co electrodes at low temperature (coercive field modulation up to 27% and saturation magnetization absolute modulation up to 4% at T = 10 K for electric field not exceeding 6 kV/cm). The modulation degree faints upon increase of the temperature, evidencing that the thermal energy eventually dominates all other relevant energy scales. Candidate mechanisms are discussed for the explanation of these experimental observations. The results presented here demonstrate that commercially available materials can result in quantitatively noticeable effects. Thus, such elemental Co/PMN-PT/Co units can be used as a solid basis for the development of devices. 2013 AIP Publishing LLC. In many cases, technological advances are based on artificial low-dimensional structures of heterogeneous constituents, thus called hybrids, that when come together they provide stand-alone entities that exhibit entirely different properties. Such hybrids are nowadays intensively studied since they are attractive for both basic research and oncoming practical applications. Here, we studied hybrids constituted of piezoelectric (PE) and ferromagnetic (FM) components in the form FM/PE/FM, ultimately aiming to provide means for the controlled modulation of the properties of the FM electrodes, originating from the strain imposed to them by the PE mediator when an electric field is applied. The PE component is in single crystal form, 0.71Pb(Mg 1/3 Nb 2/3 )O 3 -0.29PbTiO 3 (PMN-PT), while the FM outer layers are Cobalt (Co) in thin film form. Detailed magnetization measurements performed under variation of the electric field applied to PMN-PT demonstrated the efficient modulation of the properties of the Co electrodes at low temperature (coercive field modulation up to 27% and saturation magnetization absolute modulation up to 4% at T ¼ 10 K for electric field not exceeding 6 kV/cm). The modulation degree fa...

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“…[8±10,18]. Therefore, in general, the thickness dependence of the local surface slope will be dierent for dierent growth modes, which will result in dierent morphology contributions on proximity pinning eects [7,16].…”

Section: Resultsmentioning

confidence: 99%

“…www.elsevier.nl/locate/physc roughness exponents (which quantify ®ne roughness details at short wavelengths) H (<0.5) can strongly in¯uence DT c =T c besides the long wavelength roughness ratio D=n with D the rms roughness amplitude and n the lateral correlation length [7]. A rough self-ane growth front arises due to competition between noise induced roughening and surface relaxation of incoming adatoms (stable growth) [8±10].…”

Section: Introductionmentioning

confidence: 99%

Influence of quasi-layer-by-layer roughness on proximity effects in thin film superconducting/normal-metal junctions

Palasantzas

Hosson

2001

Physica C: Superconductivity

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We investigate the in¯uence of quasi-layer-by-layer interface roughness on proximity eects, at the junction of a thin surperconducting/normal-metal ®lm. The reduction of the superconducting ®lm critical temperature DT c =T c is shown to decrease with ®lm thickness in an oscillatory manner, which re¯ects the presence of growth front pinning eects during roughness formation. The oscillations are signi®cant for weak surface relaxation where DT c =T c varies signi®cantly with ®lm thickness, and decrease in magnitude with increasing ®lm thickness. In contrast, in the presence of growth front instability, the pinning induced oscillations are shown to be further ampli®ed with increasing instability strength.

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Enhancement of proximity effects due to random roughness at a superconductor/metal interface

Cited by 4 publications

References 17 publications

Investigation of Surface Roughness Effect on Transition Edge Sensor Microcalorimeters Using Multilayer Readout Wiring

Investigation of Surface Roughness Effect on Transition Edge Sensor Microcalorimeters Using Multilayer Readout Wiring

Modulation of the properties of thin ferromagnetic films with an externally applied electric field in ferromagnetic/piezoelectric/ferromagnetic hybrids

Influence of quasi-layer-by-layer roughness on proximity effects in thin film superconducting/normal-metal junctions

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