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Phase diagram of a superconductor / ferromagnet bilayer | M. Lange
; M. J. Van Bael
; V. V. Moshchalkov
; | Date: |
7 Oct 2003 | Journal: | Phys. Rev. B 68, 174522 (2003) | Subject: | Superconductivity | cond-mat.supr-con | Abstract: | The magnetic field (H) - temperature (T) phase diagram of a superconductor is significantly altered when domains are present in an underlying ferromagnet with perpendicular magnetic anisotropy. When the domains have a band-like shape, the critical temperature Tc of the superconductor in zero field is strongly reduced, and the slope of the upper critical field as a function of T is increased by a factor of 2.4 due to the inhomogeneous stray fields of the domains. Field compensation effects can cause an asymmetric phase boundary with respect to H when the ferromagnet contains bubble domains. For a very inhomogeneous domain structure, Tc~H^2 for low H and Tc~H for higher fields, indicating a dimensional crossover from a one-dimensional network-like to a two-dimensional behavior in the nucleation of superconductivity. | Source: | arXiv, cond-mat/0310132 | Services: | Forum | Review | PDF | Favorites |
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