Enhanced critical current density in GdBa2Cu3O7−δ thin films with substrate surface decoration using Gd2O3 nanoparticles

Tran, Duc H.; Putri, W. B. K.; Wie, Chang Hwan; Kang, Byeongwon; Lee, N.H.; Kang, W. N.; Lee, J.Y.; Seong, Won Kyung

doi:10.1016/j.tsf.2012.11.013

Cited by 6 publications

(4 citation statements)

References 21 publications

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“…Many methods have been reported to enhance the pinning and thereby improve the critical current density [5]. These include the secondary phase impurities or nanoparticles' addition [6][7][8], doping of rareearth elements [9,10], substrate surface modifications [11][12][13], and magnetic pinning induced by adjacent magnetic dot arrays [14,15] or ferromagnetic thin films [16][17][18][19][20][21][22]. Among these, vortex pinning induced by the adjacent ferromagnet is of special interest from both the theoretical and application aspects.…”

Section: Introductionmentioning

confidence: 99%

Vortex structures and magnetic domain patterns in the superconductor/ferromagnet hybrid bilayer

Jing¹,

Yong²,

Zhou³

2014

Supercond. Sci. Technol.

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Superconducting vortices and magnetic domain patterns' evolution in the superconductorferromagnet (SC/FM) hybrid bilayer are investigated within the Ginzburg-Landau (GL) theory of superconductivity, in combination with the Landau-Lifshitz-Gilbert (LLG) equation of ferromagnetism. Magnetic domain patterns in the ferromagnetic thin film and the vortices' nucleation in the superconducting layer for the hybrid bilayer, subjected to perpendicular magnetic fields, are obtained by numerical simulations. A dynamical evolution picture of the magnetic domain patterns and the associated superconducting vortices' nucleation are clearly shown. The effect of geometry parameters and physical parameters on the magnetic domain and superconducting vortex evolution are discussed. The magnetization curve of the SC film has also been illustrated. We found that the vortex dynamic behavior of the superconducting film changes substantially, and the correlated magnetic hysteresis loss is significantly reduced due to the presence of the ferromagnetic thin layer. In addition, the spontaneous vortex-antivortex (V-AV) pairs' nucleation in the hybrid bilayer are investigated.

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Section: Introductionmentioning

confidence: 99%

Vortex structures and magnetic domain patterns in the superconductor/ferromagnet hybrid bilayer

Jing¹,

Yong²,

Zhou³

2014

Supercond. Sci. Technol.

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“…We deduced J c from hysteresis loops from modified Bean model J c = 20¦M/[b(1-b/3a)] in which a and b were length and width of the samples, respectively. 20) J c of the sample Na000 was recorded to be ³6.1 © 10 4 A/cm 2 at 0 T and started to decrease as field increased. Both self-field and in-field J c of Na substituted samples were observed to enhance.…”

Section: Resultsmentioning

confidence: 97%

“…To examine the flux pinning properties of samples, the pinning force density (F p ) was estimated using the relation F p = J c © B. 20) Figure 5 provided the dependence of F p on the reduced magnetic field b (b = B/B irr ). Sample Na000 showed the peak of F p (F pmax ) ³ 2.7 © 10 7 N/m 3 and its position was recorded at h ³ 0.2.…”

Section: Resultsmentioning

confidence: 99%

Enhancements of Critical Current Density in the Bi–Pb–Sr–Ca–Cu–O Superconductor by Na Substitution

Tran

Lee

et al. 2018

Mater. Trans.

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In this paper, we investigated the influences of Na substitution on the enhancements of critical current density (J c) in the BiPbSrCaCuO (BPSCCO) superconductors. The Bi 1.6 Pb 0.4 Sr 2 Ca 2¹x Na x Cu 3 O 10+¤ (where x was ranged from 0 to 0.1) polycrystalline samples were fabricated using solid state reaction technique. The zero electrical critical temperature (T c) of Na-substituted BPSCCO samples was found to be slightly higher than that of Na-free BPSCCO one. Magnetization J c data measured at 65 K with field applied parallel to the c-axis of the samples showed that J c of Na-substituted BPSCCO samples were enhanced. Possible reasons for the J c enhancements were attributed to the effective flux pinning by crystal defects at Ca layers generated by Na substitution. Improvements of volume pinning force (F p) in terms of magnitude and position of F pmax were also obtained.

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“…These two observable features provide solid evidence for the improvement of the pinning strength in the Na-substituted samples. 24,25 The origin of these improvements is likely to be linked to the formation of point-like defects, which are projected to serve as pinning centers. 13 Although the pinning strength was found to increase with decreasing temperature, the temperature dependence of the flux pinning mechanism must be discussed.…”

Section: Resultsmentioning

confidence: 99%

Unraveling the Scaling Characteristics of Flux Pinning Forces in Bi1.6Pb0.4Sr2Ca2−xNaxCu3O10+δ Superconductors

Pham

Tran

Tai

et al. 2021

Journal of Elec Materi

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The temperature and magnetic field dependence of the critical current density (J c) and pinning force density (F p) in Bi 1.6 Pb 0.4 Sr 2 Ca 2Àx Na x Cu 3 O 10+d (x = 0, 0.02, 0.04, 0.06, 0.08, and 0.10) high-temperature superconductors is reported. Polycrystalline samples were prepared by a conventional solid-state reaction route. The influence of Na substitution on J c and F p at temperatures ranging between 65 K and 25 K was investigated. The collective pinning model is successfully applied to describe the magnetic field dependence of J c for all the samples investigated. Magnetic field-temperature phase diagrams were also constructed to illustrate the effects of Na substitution in different field regions. The power-law dependence of the maximum F p (F p,max) versus the irreversibility field (B irr) at different temperatures shows nearly unchanged exponent values, suggesting temperature independence of the flux pinning mechanism in the Na-substituted samples. The dominant pinning mechanism is confirmed to be dl pinning, induced by fluctuations in the mean free path of charge carriers.

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Enhanced critical current density in GdBa2Cu3O7−δ thin films with substrate surface decoration using Gd2O3 nanoparticles

Cited by 6 publications

References 21 publications

Vortex structures and magnetic domain patterns in the superconductor/ferromagnet hybrid bilayer

Vortex structures and magnetic domain patterns in the superconductor/ferromagnet hybrid bilayer

Enhancements of Critical Current Density in the Bi–Pb–Sr–Ca–Cu–O Superconductor by Na Substitution

Unraveling the Scaling Characteristics of Flux Pinning Forces in Bi1.6Pb0.4Sr2Ca2−xNaxCu3O10+δ Superconductors

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