Physical properties of the superconducting spin-valve Fe/Cu/Fe/In heterostructure

P. V. Leksin; N. N. Garif'yanov; I. A. Garifullin; J. Schumann; V. Kataev; O. G. Schmidt; B. Büchner

doi:10.1103/PhysRevB.85.024502

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Physical properties of the superconducting spin-valve Fe/Cu/Fe/In heterostructure

P. V. Leksin, N. N. Garif'yanov, I. A. Garifullin, J. Schumann, V. Kataev, O. G. Schmidt, B. Büchner

DOI 10.1103/PhysRevB.85.024502 · Physical Review B

T1

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Abstract

We report on structural, magnetic, and superconducting properties of the spin-valve multilayer system CoOx/Fe1/Cu/Fe2/In. For most of the thicknesses of the second iron layer dFe2 up to 2 nm, we have observed a full spin-valve effect for the superconducting current, i.e., a complete transition from the normal to the superconducting state by changing the mutual orientation of the magnetizations of the Fe1 and Fe2 layers. For dFe2<1 nm, the superconducting transition temperature TcP for the parallel orientation of magnetizations of the Fe1 and Fe2 layers is smaller than that for the antiparallel orientation TcAP, which corresponds to the direct spin-valve effect. For dFe2⩾1 nm, we have found the inverse spin-valve effect with ΔTc=TcAP−TcP<0. Further, in samples with a fixed thickness of the In layer, we have observed an oscillating dependence of its superconducting transition temperature Tc on dFe2. The analysis of the Tc(dFe2) dependence using the theory of the superconducting-ferromagnetic proximity effect has enabled determination of all microscopic parameters of the studied system. With these parameters, a satisfactory description of the sign-changing oscillating behavior of the spin-valve effect ΔTc(dFe2) has been obtained using a recent theory by Fominov et al. [Ya. V. Fominov et al., Pis'ma Zh. Eksp. Teor. Fiz. 91, 329 (2010) [JETP Lett. 91, 308 (2010)]].

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.38	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.32	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.39	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.05	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.2	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.11	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.01	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.08	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.98	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.96	Pressure not reported	unknown
In Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.03	Pressure not reported	unknown