Investigation of Ni and Co Deposition into Porous Silicon and the Influence of the Electrochemical Parameters on the Physical Properties

Rumpf, Klemens; Granitzer, Petra; Reissner, M.; Poelt, Peter; Albu, Mihaela

doi:10.1149/1.4718391

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…Porous silicon filled with Ni nanostructures offers a coercivity of H C =300 Oe and a reduced remanence of M R /M S = 0.28 [9]. Co deposited within porous silicon leads to coercivities of about H C = 450 Oe and a reduced remanence of M R /M S = 0.13 [10]. So both materials have been combined to enhance the magnetic properties.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Magnetic Characterization of Nanostructured Silicon with Bi-Metal Filling

Rumpf

Granitzer

Michor³

et al. 2017

ECS Trans.

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Bi-metal magnetic nanostructures have been deposited within porous silicon (PSi) to influence the magnetic switching behavior of the PSi/metal nanocomposite and further to enhance the energy product of the system compared to single metal nanocomposites. These nanocomposites consisting of two ferromagnetic metals have been achieved by two different routes. On the one hand both metals have been deposited alternatingly out of one solution and on the other hand the two metals have been deposited by using different metal salt solutions alternately. The latter system shows two distinct slopes of the hysteresis due to the different saturation behavior of the two types of deposited metal, whereas the system produced from one electrolyte shows no kink which indicates exchange coupling between the two metals. The comparison of these two types of samples shows that the one offering exchange coupling exhibits nearly a doubled coercivity and remanence.

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Section: Resultsmentioning

confidence: 99%

Synthesis and Magnetic Characterization of Nanostructured Silicon with Bi-Metal Filling

Rumpf

Granitzer

Michor³

et al. 2017

ECS Trans.

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“…In that study, the biocompatibility and nontoxicity of PSi/Co were also assessed. Rumpf et al [11] studied the effect of current density on the structural and magnetic properties of cobalt deposited PSi obtained by electrodeposition. In a more recent work, Bouzourâa et al [6] reported the effects of annealing temperature and immersion duration on PL characteristics of cobalt-porous silicon nanocomposites prepared via immersion method.…”

Section: Introductionmentioning

confidence: 99%

“…PSi/Co nanostructures can be produced by a variety of techniques such as immersion method, stain etching, and electrodeposition [6,8,11]. Among these techniques, electrodeposition provides the ability to tailor size, shape, and morphology of the Co deposited under a set of well controlled synthesis parameters [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of the synthesis conditions on the properties of Co embedded porous Si nanostructures

Çetinel

Artunç

Tarhan

2019

Materials Science and Engineering: B

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The electrodeposition of cobalt in the porous silicon (PSi) substrate was investigated in terms of the deposition times and current densities. The PSi/Co samples were characterized by SEM, XRD, Raman, and photoluminescence (PL) spectroscopies. The results indicated that for all current densities, the PL intensities of PSi/Co samples with shorter deposition times (t s ≤ 20 min) increased due to spherical Co nanoparticles (NPs) could be created the new recombination centers, compared to that of the undeposited PSi. On the other hand, the PL intensity of PSi/Co samples significantly decreased at longer deposition times (t l > 20 min) because of larger Co NP cluster promoted the formation of non-radiative centers. The increased PL intensities in samples with t s were attributed to both the quantum confinement effect and surface effects. PL analyses also suggested that after exposure to air for 60 days, PL characteristics of PSi/Co were stabilized depending on deposition time and current density. how structural, morphological and PL properties of PSi/Co nanostructures vary with the Co nanoparticles deposited via the

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Arrays of Ni/Co Nanoparticles within a Nanostructured Silicon Host

Rumpf

Granitzer

González-Rodríguez

et al. 2020

Physica Status Solidi (a)

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Herein, nanostructured silicon is fabricated with two different embedded magnetic nanostructures (Ni/Co) to exploit the magnetic properties of both metals and discern the behavior of the exchange coupling between the two—especially with respect to their volume ratio. A variation of the size as well as the volume ratio of the two metals modifies the exchange coupling and thus the energy product. Two templates are utilized: one involves the use of porous silicon (PSi) and the other entails porous silicon nanotubes (SiNTs). In the case of Psi, the bimetallic structures (Ni/Co) are electrodeposited, whereas in the case of SiNTs, Co is chemically grown within the tubes followed by the deposition of Ni on the outside. The magnetic properties of the systems strongly depend on the geometry of the deposits, on the volume ratio of the two metals, as well as on the proximity of the deposits. If the distance is small enough magnetic exchange coupling is present. Due to their size and the coupling of the bimetallic structures, the switching behavior of the hysteresis can be varied. Ultimately, nanocomposites with an energy product as high as possible is achieved to give rise to applications as permanent nanomagnets.

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Investigation of Ni and Co Deposition into Porous Silicon and the Influence of the Electrochemical Parameters on the Physical Properties

Cited by 5 publications

References 8 publications

Synthesis and Magnetic Characterization of Nanostructured Silicon with Bi-Metal Filling

Synthesis and Magnetic Characterization of Nanostructured Silicon with Bi-Metal Filling

Effect of the synthesis conditions on the properties of Co embedded porous Si nanostructures

Arrays of Ni/Co Nanoparticles within a Nanostructured Silicon Host

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