Upper critical field Hc3 for a thin-film superconductor with a ferromagnetic dot

Sa-Lin Cheng; H. A. Fertig

doi:10.1103/PhysRevB.60.13107

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Upper critical field Hc3 for a thin-film superconductor with a ferromagnetic dot

Sa-Lin Cheng, H. A. Fertig

DOI 10.1103/PhysRevB.60.13107 · Physical Review B

T1

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Abstract

We investigate the effect of a ferromagnetic dot on a thin-film superconductor. We use a real-space method to solve the linearized Ginzburg-Landau equation in order to find the upper critical field Hc3. We show that Hc3 is crucially dependent on dot composition and geometry, and may be significantly greater than Hc2. Hc3 is maximally enhanced when (i) the dot saturation magnetization is large, (ii) the ratio of dot thickness to dot diameter is of order one, and (iii) the dot thickness is large.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.2	Pressure not reported	unknown