Competing Exchange Interactions in Magnetic Multilayers

Skubic, Björn; Holmström, Erik; Iuşan, Diana; Bengone, O.; Eriksson, Olle; Bručas, Rimantas; Hjörvarsson, Bjørgvin; Stanciu, Victor Ioan; Nordblad, Per

doi:10.1103/physrevlett.96.057205

Cited by 34 publications

(22 citation statements)

References 29 publications

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“…Epitaxial superlattices ͓V / Fe x V 1−x ͔ and ͓Fe/ Fe x V 1−x ͔ can be prepared on MgO͑100͒ with a quality similar to that of ͓Fe/V͔, as shown recently by Skubic et al 52 The alloy system Fe x V 1−x forms a homogeneous solid solution down to the critical concentration of spontaneous ferromagnetism close to x = 0.22. 21,52 The atomic magnetic moment of Fe decreases approximately linearly with the Fe concentration 21 and the magnetic exchange interaction is expected to decrease correspondingly. The weakening of the exchange interaction should decrease the critical thickness for superconductivity in the V layer and thus enable larger S / d S values and simultaneously enhance the interface transparency.…”

Section: F1/s/f2-type Superconducting Spin Valvesmentioning

confidence: 70%

Superconducting spin valves based on epitaxial Fe/V superlattices

et al. 2008

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In superconducting spin valves of the type S/F1/N/F2 or F1/S/F2 with a superconducting layer S, two ferromagnetic layers F1 and F2, and a normal metallic layer N, the superconducting transition temperature T S depends on the relative magnetization direction of the ferromagnetic layers F1 and F2. The difference of the transition temperature ⌬T S = T s AP − T s P with the magnetization direction of F1 and F2 either antiparallel or parallel is called the superconducting spin valve effect. We have prepared both types of spin valves by growing Fe/V thin-film heterostructures with epitaxial quality on MgO͑001͒ substrates. In the S/F1/N/F2-type spin valves the ferromagnetic layers were the first two Fe layers of a ͓Fe/V͔ superlattice coupled antiferromagnetically via the interlayer exchange interaction. Here we observed a superconducting spin valve shift of up to ⌬T S Ϸ 200 mK when aligning the sublattice magnetization in an external magnetic field. In the F1/S/F2-type spin valves the ferromagnetic layer F1 was either a ͓Fe/V͔ or a ͓Fe x V 1−x / V͔ superlattice, the F2 layer was a Fe-, a Co-, or a Fe x V 1−x film. Using weakly ferromagnetic Fe x V 1−x alloy layers as F1 and F2 we find a spin valve effect of up to ⌬T S Ϸ 20 mK, which is more than a factor of 2 larger than reported in the literature before for spin valves with comparable transition temperatures. Our results indicate that a high interface transparency and a large superconducting correlation length are prerequisites for the observation of a sizable superconducting spin valve effect.

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Section: F1/s/f2-type Superconducting Spin Valvesmentioning

confidence: 70%

Superconducting spin valves based on epitaxial Fe/V superlattices

et al. 2008

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“…This interface modeling technique has been applied recently to study interface quality effects in a variety of multilayer systems. 4,5,[37][38][39][40][41][42] Interfaces between two metals may also intermix as plateaus if the two metal segregate. The interface stability may be estimated from the rescaled formation energy and depend on crystal structure, interface direction, and the thickness of the intermixed region.…”

Section: Interface Mixingmentioning

confidence: 99%

Interface core-level shifts as a probe of embedded thin-film quality

et al. 2011

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We use first-principles calculations of layer-resolved core-level binding energy shifts (CLSs) within density functional theory as a way to characterize the interface quality and thickness in embedded thin-film nanomaterials. A closer study of interfaces is motivated as properties specific to nanostructures can be related directly to the interface environment or indirectly as interference effects due to quantum confinement. From an analysis based on the Cu 2p 3/2 CLS for Cu embedded in Ni and Co fcc (100) and Fe bcc (100), with the interfaces represented by intermixing profiles controlled by a single parameter, we evaluate layer-resolved shifts as a probe of the thin-film quality. The core-level shifts in the corresponding disordered alloys, as well as local environment effects, are studied for comparison. We also discuss the possibility of detecting interface states by means of core-level shift measurements.

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“…The strength and sign of the interlayer exchange coupling could be tuned by alloying the spacer with nonmagnetic elements [7] or using hydrogen [8,9]. In the later case it could be changed not only by electronic structure but also by thickness of the spacer.…”

Section: Introductionmentioning

confidence: 99%

Growth and Structural Characterisation of V/Fe Multilayers

et al. 2015

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The (110) oriented V/Fe multilayers were prepared at room temperature using UHV magnetron sputtering. As a substrate we have used Si(100) wafers with an oxidised surface. The surface chemical composition and the cleanness of all layers was checked in situ, immediately after deposition, transferring the samples to an UHV analysis chamber equipped with X-ray photoelectron spectroscopy. The structure of the multilayers has been studied ex situ by low-and high-angle X-ray diraction. The modulation wavelength was determined from the spacing between satellite peaks in the X-ray diraction patterns. Results were consistent with the values obtained from total thickness divided by the number of repetitions. Growth of the Fe (V) on 1.6 nm V (Fe) underlayer was studied by succesive deposition and X-ray photoelectron spectroscopy measurements starting from 0.2 nm of Fe (V) layer, respectively. From the exponential variation of the X-ray photoelectron spectroscopy Fe 2p and V 2p integral intensities with increasing layer thickness we conclude that the Fe and V sublayers grow homogeneously in the planar mode.

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Competing Exchange Interactions in Magnetic Multilayers

Cited by 34 publications

References 29 publications

Superconducting spin valves based on epitaxial Fe/V superlattices

Superconducting spin valves based on epitaxial Fe/V superlattices

Interface core-level shifts as a probe of embedded thin-film quality

Growth and Structural Characterisation of V/Fe Multilayers

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