A superconductive magnetoresistive memory element using controlled exchange interaction

Oh, Sangjun; Youm, Dojun; Beasley, M. R.

doi:10.1063/1.120032

Cited by 220 publications

(145 citation statements)

References 12 publications

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“…Being interested in superconducting spin-valve physics, proposed by the Beasley group [13] and later developed in Refs. [14,15,16,17], here we present the results of our measurements of a critical magnetic field H c2 in Cu 41 Ni 59 /Nb/Cu 41 Ni 59 spinvalve cores for the parallel and perpendicular to the sample plane geometry.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the unique properties of S/F hybrids, several kinds of device physics were proposed such as proximity-effect superconducting spin-switching [13,14,15,16,17] and Josephson current switching [18,19,20] actuated by an external magnetic field. Very recently, magnetic-field-controlled superconductivity switching in the S/F proximity systems [21,22,23,24,25] and the Josephson current switching in the S/F/S junctions [26,27] were demonstrated experimentally.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and theoretical analysis of the upper critical field in ferromagnet–superconductor–ferromagnet trilayers

Antropov¹,

Kalenkov²,

Kehrle³

et al. 2013

Supercond. Sci. Technol.

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Abstract. The upper critical magnetic field H c2 in thin-film FSF trilayer spinvalve cores is studied experimentally and theoretically in geometries perpendicular and parallel to the heterostructure surface. The series of samples with variable thicknesses d F1 of the bottom and d F2 of the top Cu 41 Ni 59 F-layers are prepared in a single run, utilizing a wedge deposition technique. The critical field H c2 is measured in the temperature range 0.4 − 8 K and for magnetic fields up to 9 Tesla. A transition from oscillatory to reentrant behavior of the superconducting transition temperature versus F-layers thickness, induced by an external magnetic field, has been observed for the first time. In order to properly interpret the experimental data, we develop a quasiclassical theory, enabling one to evaluate the temperature dependence of the critical field and the superconducting transition temperature for an arbitrary set of the system parameters. A fairly good agreement between our experimental data and theoretical predictions is demonstrated for all samples, using a single set of fit parameters. This confirms adequacy of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) physics in determining the unusual superconducting properties of the studied Cu 41 Ni 59 /Nb/Cu 41 Ni 59 spin-valve core trilayers.Experimental and theoretical analysis of the upper critical field in FSF trilayers 2

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical analysis of the upper critical field in ferromagnet–superconductor–ferromagnet trilayers

Antropov¹,

Kalenkov²,

Kehrle³

et al. 2013

Supercond. Sci. Technol.

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“…Recently, an alternative F1/N/F2/S design of the superconducting spin valve [36] attracted much attention [37][38][39] because of possible high sensitivity of the superconducting T c to generation of the long-range triplet component of superconducting pairing [40,41]. Indeed, recent calculations have shown [42] that not only the "direct switching" ( ) [42], which can be most spectacularly detected as a reentrant behavior of superconductivity as a function of the angle between magnetic moments of the F1 and F2 ferromagnetic layers.…”

Section: Other Possible Design Of Superconducting Spin Valve -"Triplementioning

confidence: 99%

Reentrance phenomenon in superconductor/ferromagnet nanostructures and their application in superconducting spin valves for superconducting electronics

Сидоренко

2017

Low Temperature Physics

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In superconductor/ferromagnet layered structures, a Fulde-Ferrell-Larkin-Ovchinnikov-like inhomogeneous superconducting pairing give rise. The singlet and zero-projection triplet components of the pairing oscillate in space, and the presence of interfaces causes interference phenomena. As the result of the interference, the superconducting critical temperature T c oscillates as a function of the ferromagnetic layer thicknesses or, even more spectacular, reentrant superconductivity appears. Two ferromagnetic layers can be combined with a superconducting layer into a superconducting spin valve. Proper design and choice of the material parameters give possibility to control superconducting T c manipulating with magnetic configurations in the system. The conditions to get large spin-valve effect, i.e., a large shift in the critical temperature, are reviewed in the article.

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“…The superconducting spin-valve effect consists in the fact that the degrees of suppression of superconductivity in thin-film multilayer structures F1/F2/S or F1/S/F2 are different for the parallel (P) and antiparallel (AP) relative orientations of the magnetizations of the F1 and F2 ferromagnetic layers [1]. The operation of the superconducting spin valve based on the superconductor/ferromagnet (S/F) proximity effect provides a key to the understanding of many fundamental aspects of the relationship between superconductivity and magnetism.…”

Section: Introductionmentioning

confidence: 99%

Isolation of proximity-induced triplet pairing channel in a superconductor/ferromagnet spin valve

et al. 2018

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Abstract. In the present work we have studied the proximity-induced superconducting triplet pairing in CoO x /Py1/Cu/Py2/Cu/Pb spin-valve structure (where Py = Ni 0.81 Fe 0.19 ).For CoO x (3 nm)/Py(3 nm)/Cu(4 nm)/Py(0.6 nm)/Cu(2 nm)/Pb(70 nm) we have studied the dependence of the T c on the angle α between the direction of the cooling field and the external field both applied in the plane of the sample. We obtained that the T c does not change monotonically with the angle but passes through a minimum. To observe an "isolated" triplet spin-valve effect we exploited the oscillatory feature of the magnitude of the ordinary spin-valve effect ∆T c in the dependence of the Py2-layer thickness d Py2 . We determined the value of d Py2 at which ∆T c caused by the ordinary spin-valve effect is suppressed. This means that the difference in the T c between the antiparallel and parallel mutual orientation of magnetizations of the Py1 and Py2 layers is zero. For such a sample a "pure" triplet spin-valve effect which causes the minimum in T c at the orthogonal configuration of magnetizations has been observed.

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A superconductive magnetoresistive memory element using controlled exchange interaction

Cited by 220 publications

References 12 publications

Experimental and theoretical analysis of the upper critical field in ferromagnet–superconductor–ferromagnet trilayers

Experimental and theoretical analysis of the upper critical field in ferromagnet–superconductor–ferromagnet trilayers

Reentrance phenomenon in superconductor/ferromagnet nanostructures and their application in superconducting spin valves for superconducting electronics

Isolation of proximity-induced triplet pairing channel in a superconductor/ferromagnet spin valve

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