Size of stripe domains in a superconducting ferromagnet

Abstract

In a superconducting ferromagnet, the superconducting state appears in the ferromagnetic phase where usually a domain structure has already developed. We study the influence of the superconducting screening currents on a stripe structure with out-of-plane magnetization, in a film of arbitrary thickness. We find that superconductivity always induces a shrinkage of the domains, and there is a critical value of penetration depth below which a mono-domain structure is more stable than the periodic one. Furthermore we investigate the possible different effects of singlet and triplet superconductivity on the domain width, as well as the conditions for the existence of vortices in the domains. The obtained results are then discussed in light of the experimental data of superconducting ferromagnets URhGe, UGe2, and UCoGe.

Domain Meissner state and spontaneous vortex-antivortex generation in the ferromagnetic superconductor EuFe 2 (As 0.79 P 0.21 ) 2

“…Later on, Fauré and Buzdin ( 16 ) and Dao et al . ( 17 ) predicted that the demagnetization effect should lead to the additional shrinkage of the DMS. This would correspond to the experimentally revealed short-period DMS in Fig.…”

Review of U-based Ferromagnetic Superconductors: Comparison between UGe2, URhGe, and UCoGe

“…No shrinkage of FM domains has been detected, as proposed theoretically. 121,122) Recent calculations of the magnetization in the FM-SC phase confirm slight magnetization expulsion in the frame of two FM bands with equal spin pairing. 31) The regime near the vortex core may be the origin of the fast component of T 1 .…”

Exact asymptotic behavior of magnetic stripe domain arrays

“…[15][16][17][18] Moreover, it has been shown that the magnetic stripe domain structure, when placed adjacent to type-II superconductors, can strongly interact with the vortex matter, both in a manipulative way [19][20][21] and as a method to enhance flux pinning in the superconductor. [22][23][24] Thus one sees today considerable renewed interest in the collective behavior of magnetic stripe domains.…”