Growth and x-ray characterization of Co/Cu (111) superlattices

Bödeker, P.; Abromeit, A.; Bröhl, K.; Sonntag, Philippe; Metoki, Naoto; Zabel, H.

doi:10.1103/physrevb.47.2353

Cited by 80 publications

(42 citation statements)

References 27 publications

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“…For each sample X-ray reflectivity scans in the range 2Y ¼ 0:4220 , radial scans in the range 2Y ¼ 40280 , and transverse scans (o-scans) around the main peaks were made [16,17]. No higher order peaks from the superlattice structure were found in the range 80 p2Yp120 , as verified by complementary scans on each sample.…”

Section: Structural Characterizationmentioning

confidence: 99%

The influence of interlayer exchange coupling on magnetic ordering in Fe/V superlattices

Marcellini

Pärnaste

Hjörvarsson

et al. 2009

Journal of Magnetism and Magnetic Materials

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Section: Structural Characterizationmentioning

confidence: 99%

The influence of interlayer exchange coupling on magnetic ordering in Fe/V superlattices

Marcellini

Pärnaste

Hjörvarsson

et al. 2009

Journal of Magnetism and Magnetic Materials

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“…Although the stable crystalline phase of Co is the hexagonal close-packed (hcp) structure and no direct structural studies have been performed on the present electrodeposited samples, they probably exhibit, at least up to a certain thickness of the individual Co layers, a facecentered cubic (fcc) structure [41], especially when stabilized by adjacent Cu layers from both sides [27,28,42]. Even if a small hcp-fraction in the Co layers cannot be excluded for larger thicknesses, according to the careful measurements of Liu et al [41] on epitaxially-grown fcc and hcp Co thin films, the magnetic moments are identical within an experimental error of 3.5 % for the two phases.…”

Section: Magnetizationmentioning

confidence: 99%

Magnetic and magnetoresistance studies of nanometric electrodeposited Co films and Co/Cu layered structures: Influence of magnetic layer thickness

Zsurzsa

Péter

Kiss

et al. 2017

Journal of Magnetism and Magnetic Materials

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-The magnetic properties and the magnetoresistance behavior were investigated for electrodeposited nanoscale Co films, Co/Cu/Co sandwiches and Co/Cu multilayers with individual Co layer thicknesses ranging from 1 nm to 20 nm. The measured saturation magnetization values supported reasonably the validity of the nominal layer thicknesses. All three types of layered structure exhibited anisotropic magnetoresistance for thick magnetic layers whereas the Co/Cu/Co sandwiches and Co/Cu multilayers with thinner magnetic layers exhibited giant magnetoresistance (GMR), the GMR magnitude being the largest for the thinnest Co layers. The decreasing values of the relative remanence and the coercive field when reducing the Co layer thickness down to below about 3 nm indicated the presence of superparamagnetic (SPM) regions in the magnetic layers which could be more firmly evidenced for these samples by a decomposition of the magnetoresistance vs. field curves into a ferromagnetic and an SPM contribution. For thicker magnetic layers, the dependence of the coercivity (H c ) on magnetic layer thickness (d) could be described for each of the layered structure types by the usual equation H c = H co + a/d n with an exponent around n = 1. The common value of n suggests a similar mechanism for the magnetization reversal by domain wall motion in all three structure types and hints, at the same time, for the absence of coupling between magnetic layers in the Co/Cu/Co sandwiches and Co/Cu multilayers.

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“…3, exhibits eight well-defined peaks with a pair of peaks separated by 45°a ccompanying each V͑020͒ reflection. The origin of this pseudocubic in-plane symmetry of the Co-layer is known to result from two types of crystalline domains formed during the epitaxial growth of hcp Co on bcc V. 36,39 …”

Section: A Structural Propertiesmentioning

confidence: 99%

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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Growth and x-ray characterization of Co/Cu (111) superlattices

Cited by 80 publications

References 27 publications

The influence of interlayer exchange coupling on magnetic ordering in Fe/V superlattices

The influence of interlayer exchange coupling on magnetic ordering in Fe/V superlattices

Magnetic and magnetoresistance studies of nanometric electrodeposited Co films and Co/Cu layered structures: Influence of magnetic layer thickness

Superconducting spin valves based on epitaxial Fe/V superlattices

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