Magnetic shielding properties of YBa2Cu3O7−x thick films deposited on silver cylinders with the continuous detonation spray technique

Pavese, Franco; Bianco, Manuel; Andreone, D.; Cresta, R.; Rellecati, P.

doi:10.1016/0921-4534(92)90565-t

Cited by 25 publications

(11 citation statements)

References 14 publications

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“…For example, thick films based on spinel ferrites are used for high-frequency devices at around 1 GHz [9] and thick films based on barium hexaferrite ðBaFe 12 O 19 Þ can be used for high-frequency devices above 40 GHz [10,11]. Typically, thick magnetic films are prepared with screen printing, spray coating, and tape casting [12][13][14]. Only a few examples of thick films based on spinel ferrites being prepared with EPD have been reported [15][16][17].…”

Section: Introductionmentioning

confidence: 98%

Barium hexaferrite suspensions for electrophoretic deposition

Ovtar

Lisjak

Drofenik

2009

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 98%

Barium hexaferrite suspensions for electrophoretic deposition

Ovtar

Lisjak

Drofenik

2009

Journal of Colloid and Interface Science

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“…Hence, as in most previous works on the fabrication of large superconducting magnetic shields [3,6,10,[12][13][14][15][16][17][18], we focus on polygrain materials [19,20]. We assume that the shielding polycrystalline material satisfies the three following constitutive laws:…”

Section: Constitutive Lawsmentioning

confidence: 99%

Field penetration into hard type-II superconducting tubes: effects of a cap, a non-superconducting joint, and non-uniform superconducting properties

Denis

Dirickx

Vanderbemden

et al. 2007

Supercond. Sci. Technol.

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Using the numerical method of Brandt (1998 Phys. Rev. B 58 6506), we study the penetration of a uniform magnetic field that is gradually applied parallel to the axis of finite type-II superconducting tubular samples with strong pinning. This study is carried out in view of designing low-frequency magnetic shields by exploiting the diamagnetic properties of type-II superconductors. First, we compare the field penetration into open and closed tubes. For long tubes (length larger than three times the outer diameter), we show that a cap weakly affects the maximum magnetic induction that can be shielded, but greatly increases the region over which the field is nearly uniform. When the length of the tube is shorter, both the maximum shieldable magnetic induction and the uniformity of the field attenuation are enhanced by closing the tube. We also show that making a hole in the cap, which is often necessary for applications, does not greatly affect the shielding properties provided the diameter of the hole is small compared to that of the tube (hole diameter smaller than a quarter of the outer tube diameter). In view of designing large size magnetic shields, superconducting tubes of finite size need to be joined together. We therefore examine in a second part how the presence of a non-superconducting joint between the tubes affects the shielding efficiency. It is shown that the effect of a joint depends upon its position along the tube axis and strongly increases with its size. Third, we study how non-uniform superconducting properties affect the shielding capabilities.

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“…The shielding currents flow in an extended region in the periphery of the superconductor. In the superconductor, ahead of the flux front, there is no shielding current and 5 A general difficulty arises when one tries to visualize 3D magnetic field lines with axial symmetry in a 2D plot. Here, we have used contours of the vector potential A(r, z) at equidistant levels.…”

Section: Modelling Of the Field Penetration Into A Hts Tubementioning

confidence: 99%

“…The scaling laws can be obtained by changing the time unit in Maxwell's equations (5) and (6) by a factor c > 0, t → t new = t/c. Given a solution with a current density J (r, t), an applied induction B a (r, t) and a total induction B(r, t), new solutions can be found that satisfy…”

Section: Scaling Laws and Frequency Responsementioning

confidence: 99%

“…In the case of a shield that is initially not magnetized and is subjected to an increasing applied field, the internal field remains close to zero until the applied induction rises above B lim . The field then penetrates the inner region of the shield and the induction increases with the applied field [3][4][5][6][7][8]. A second important factor is the geometrical volume over which a shield of given size and shape can attenuate an external field below a given level.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spectra of quantum systems in superstrong inertial force fields

Денисов¹,

Kravtsov²

2002

Quantum Electron.

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We have experimentally studied the magnetic shielding properties of a cylindrical shell of BiPbSrCaCuO subjected to low frequency AC axial magnetic fields. The magnetic response has been investigated as a function of the dimensions of the tube, the magnitude of the applied field and the frequency. These results are explained quantitatively by employing the method of Brandt (1998 Phys. Rev. B 58 6506) with a J c (B) law appropriate for a polycrystalline material. Specifically, we observe that the applied field can sweep into the central region either through the thickness of the shield or through the opening ends, the latter mechanism being suppressed for long tubes. For the first time, we systematically detail the spatial variation of the shielding factor (the ratio of the applied field over the internal magnetic field) along the axis of a high-temperature superconducting tube. The shielding factor is shown to be constant in a region around the centre of the tube, and to decrease as an exponential in the vicinity of the ends. This spatial dependence comes from the competition between two mechanisms of field penetration. The frequency dependence of the shielding factor is also discussed and shown to follow a power law arising from the finite creep exponent n.

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Magnetic shielding properties of YBa2Cu3O7−x thick films deposited on silver cylinders with the continuous detonation spray technique

Cited by 25 publications

References 14 publications

Barium hexaferrite suspensions for electrophoretic deposition

Barium hexaferrite suspensions for electrophoretic deposition

Field penetration into hard type-II superconducting tubes: effects of a cap, a non-superconducting joint, and non-uniform superconducting properties

Spectra of quantum systems in superstrong inertial force fields

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