Nonuniform magnetization of a ferromagnet by the magnetic field of a superconducting vortex (as a problem of micromagnetism)

Genkin, G. M.; Skuzovatkin, V. V.; Tokman, I. D.

doi:10.1016/0304-8853(95)00069-0

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…Here however, the large susceptibility χ enhances the effect. A related calculation has been performed by Genkin et al [18]; however the system modelled in that paper consists of a S/FM bilayer, so the quantization condition differs from the cases considered here.…”

Section: Flux Transfer From a Single Vortex To A Magnetic Inclusionmentioning

confidence: 99%

Critical current enhancement by Lorentz force reduction in superconductor–ferromagnet nanocomposites

Blamire

Dinner

Wimbush

et al. 2009

Supercond. Sci. Technol.

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Ferromagnetic pinning centres in superconductors form much deeper potential wells than equivalent insulating or metallic non-superconducting inclusions. However, the resultant pinning forces arising from magnetic inclusions are low because the magnetic interaction takes place over the length scale of the magnetic penetration depth which is large in technological superconductors. Nonetheless, we show that a magnetic inclusion can also reduce the Lorentz force on a vortex, yielding a substantially enhanced critical current density for a given pinning force. We calculate this enhancement for a single vortex pinned by a paramagnetic cylinder as well as a vortex lattice interacting with magnetic inclusions, and find that the inclusion of ferromagnetic particles or rods offers a practical means of enhancing the critical currents in oxide high temperature superconductors.

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Section: Flux Transfer From a Single Vortex To A Magnetic Inclusionmentioning

confidence: 99%

Critical current enhancement by Lorentz force reduction in superconductor–ferromagnet nanocomposites

Blamire

Dinner

Wimbush

et al. 2009

Supercond. Sci. Technol.

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Magnetization process of ferromagnet–superconductor hybrid films

Hinoue

Shimizu

Ono

et al. 2001

Journal of Magnetism and Magnetic Materials

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Nucleation of superconductivity and vortex matter in superconductor–ferromagnet hybrids

Aladyshkin

Silhanek

Gillijns

et al. 2009

Supercond. Sci. Technol.

217

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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Nonuniform magnetization of a ferromagnet by the magnetic field of a superconducting vortex (as a problem of micromagnetism)

Cited by 5 publications

References 6 publications

Critical current enhancement by Lorentz force reduction in superconductor–ferromagnet nanocomposites

Critical current enhancement by Lorentz force reduction in superconductor–ferromagnet nanocomposites

Magnetization process of ferromagnet–superconductor hybrid films

Nucleation of superconductivity and vortex matter in superconductor–ferromagnet hybrids

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