Linear magnetic flux amplifier

Golubović, D.S.; Moshchalkov, Victor

doi:10.1063/1.2077855

Cited by 9 publications

(7 citation statements)

References 15 publications

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“…Numerous studies of symmetric superconducting quantum interferometers, i.e., the same superconducting loops, but with two Josephson junctions being a basis of the DC SQUID (Superconducting Quantum Interference Device) [11], suggest that critical current maxima and minima are observed at Φ = Φ 0 and Φ = (n + 0.5)Φ 0 , respectively. The same is observed for a symmetric aluminium ring without Josephson junctions [12]. Asymmetric rings were not studied before our experiments; however, there are papers on oscillations of the critical current of asymmetric interferometers [11,13].…”

Section: Qualitative Difference Between Expected Andsupporting

confidence: 80%

Dependence of the magnitude and direction of the persistent current on the magnetic flux in superconducting rings

Гуртовой

Dubonos

Nikulov

et al. 2007

J. Exp. Theor. Phys.

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The obtained periodic magnetic-field dependencies of the critical current Ic+(Φ/Φ0), Ic−(Φ/Φ0), measured in opposite directions on asymmetric superconducting aluminum rings, allow to explain observed earlier quantum oscillations of a dc voltage as a result of alternating current rectification. It is found, that the high efficiency of the rectification of both individual rings and ring systems is connected to a hysteresis of the current-voltage characteristics. The asymmetry of the currentvoltage characteristics providing the rectification effect is due to the relative shifts of the magnetic dependencies Ic−(Φ/Φ0) = Ic+(Φ/Φ0 + ∆φ) of the critical current measured in opposite directions. This shift means that position of Ic+(Φ/Φ0) and Ic−(Φ/Φ0) minimums does not correspond to n+0.5 magnetic flux quantum Φ0 which is in the direct contradiction with measurement results of the Little-Parks resistance oscillations. Despite of this contradiction the amplitude of the critical current anisotropy oscillations Ic,an(Φ/Φ0) = Ic+(Φ/Φ0) − Ic−(Φ/Φ0) and its variations with temperature correspond to expected amplitude of the persistent current oscillations and to its variations with temperature.

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Section: Qualitative Difference Between Expected Andsupporting

confidence: 80%

Dependence of the magnitude and direction of the persistent current on the magnetic flux in superconducting rings

Гуртовой

Dubonos

Nikulov

et al. 2007

J. Exp. Theor. Phys.

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“…Such rotation of the magnetization of the dot toward the out-of-plane direction while sweeping the external field gives rise to a z−component of magnetization depending on the external field. The effect of the stray field generated by soft permalloy dots on the critical current I c of the superconducting Al loops was experimentally studied by Golubović and Moshchalkov [385]. The monotonous decrease in the period of the oscillation on the I c (H ext ) with increasing the H ext value was interpreted as a flux enhancement due to the increase of the out-of-plane component of the dot's magnetic moment.…”

Section: Superconductor -Paramagnet Hybrid Structuresmentioning

confidence: 99%

Nucleation of superconductivity and vortex matter in superconductor–ferromagnet hybrids

Aladyshkin

Silhanek

Gillijns

et al. 2009

Supercond. Sci. Technol.

218

143

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Abstract. The theoretical and experimental results concerning the thermodynamical and low-frequency transport properties of hybrid structures, consisting of spatially-separated conventional low-temperature superconductor (S) and ferromagnet (F), is reviewed. Since the superconducting and ferromagnetic parts are assumed to be electrically insulated, no proximity effect is present and thus the interaction between both subsystems is through their respective magnetic stray fields. Depending on the temperature range and the value of the external field Hext, different behavior of such S/F hybrids is anticipated. Rather close to the superconducting phase transition line, when the superconducting state is only weakly developed, the magnetization of the ferromagnet is solely determined by the magnetic history of the system and it is not influenced by the field generated by the supercurrents. In contrast to that, the nonuniform magnetic field pattern, induced by the ferromagnet, strongly affect the nucleation of superconductivity leading to an exotic dependence of the critical temperature Tc on Hext. Deeper in the superconducting state the effect of the screening currents cannot be neglected anymore. In this region of the phase diagram various aspects of the interaction between vortices and magnetic inhomogeneities are discussed. In the last section we briefly summarize the physics of S/F hybrids when the magnetization of the ferromagnet is no longer fixed but can change under the influence of the superconducting currents. As a consequence, the superconductor and ferromagnet become truly coupled and the equilibrium configuration of this "soft" S/F hybrids requires rearrangements of both, superconducting and ferromagnetic characteristics, as compared with "hard" S/F structures. Some figures in this paper are in color only in the electronic version.

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“…At the reverse transition the quantum number takes the value n, with the probability P n ∝ exp − E n /k B T given by the laws of statistical physics. Numerous measurements of the critical current [8][9][10] and other quantities [11][12][13] confirm the overwhelming probability of lowest energy state (2).…”

Section: Possibility Of a More Sharp Magnetic Flux Dependence Of The mentioning

confidence: 99%

Superconducting quantum interference device without Josephson junctions

et al. 2014

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A new type of a superconducting quantum interference device (SQUID) based on a single superconducting loop without Josephson junctions and with asymmetric link-up of current leads is proposed. This SQUID offers advantages in simplicity of fabrication and higher sensitivity of magnetic flux. Magnetic field dependence of the critical current in aluminium rings with asymmetric link-up of current leads has been measured in order to confirm the possibility of making this type of SQUID.

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Linear magnetic flux amplifier

Cited by 9 publications

References 15 publications

Dependence of the magnitude and direction of the persistent current on the magnetic flux in superconducting rings

Dependence of the magnitude and direction of the persistent current on the magnetic flux in superconducting rings

Nucleation of superconductivity and vortex matter in superconductor–ferromagnet hybrids

Superconducting quantum interference device without Josephson junctions

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