Properties of magnetic nickel/porous-silicon composite powders

Nakamura, Toshihiro; Adachi, Sadao

doi:10.1063/1.4754152

Cited by 16 publications

(4 citation statements)

References 33 publications

(38 reference statements)

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“…In the case of magnetic metal deposition due to the small pore size the deposits are in the superparamagnetic range but because of the interconnected morphology magnetic crosstalk is present and ferromagnetic behavior is observed. Superparamagnetic behavior has been reported in the case of Ni deposition within porous silicon powder (17). The filling of mesoporous silicon with magnetic materials and the tuning of the magnetic response due to the geometry and spatial distribution of the deposits within the pores has been shown in previous works (18,19).…”

Section: Introductionmentioning

confidence: 69%

Magnetic Filling of Microporous Silicon: An Interlink Between Optical and Magnetic Behavior

et al. 2020

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In the frame of this work microporous silicon (mPSi) is filled with magnetic metals (Ni, Co) resulting in a composite system with specific magnetic properties corresponding to its branched morphology. The results are compared with mesoporous silicon (PSi) loaded with Ni nanoparticles (NPs) of comparable size. The two systems offer drastic differences in their magnetic response. Furthermore mPSi offers luminescence in the visible range, whereat this behavior is due to the small structure size in the range of a few nanometers (2 – 5 nm). The morphology of mesoporous silicon shows straight pores with a diameter up to 50 nm. Due to the different template morphology the responding magnetic behavior shows distinct properties related to the two systems, although the size of the metal deposits is in a similar size range. The Ni loaded mPSi system merges optical and magnetic properties leading to a nanocomposite appropriate for possible magneto-optical devices.

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Section: Introductionmentioning

confidence: 69%

Magnetic Filling of Microporous Silicon: An Interlink Between Optical and Magnetic Behavior

et al. 2020

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“…The results show a superparamagnetic behavior, except for a plating time of 15 min. The measured magnetization increases with the plating time till a value of 360 min and afterwards decreases again [61]. Figure 10 shows the hysteresis for various plating times (a) and the normalized saturated magnetization in dependence on the deposition time (b) [61].…”

Section: Magnetic Response Of Metal Filled Microporous Siliconmentioning

confidence: 99%

“…The peak position of the photoluminescence spectrum also depends on the NiCl 2 concentration. First a blueshift is observed which could be caused by a reduction of the emitter size due to oxidation and with further increase of the concentration the wavelengths are red shifted [61].…”

Section: Optical Properties Of Microporous Siliconmentioning

confidence: 99%

Metal Filled Nanostructured Silicon With Respect to Magnetic and Optical Properties

Granitzer

Rumpf

2020

Front. Phys.

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Within this work the utilization of nanostructured silicon as host material for filling with various magnetic nanostructures is reviewed whereas the magnetic and optical properties of the gained composite systems are elucidated. The metal filling of the pores is mainly performed by electroless deposition or by electrodeposition which is discussed by means of some examples. Furthermore, two different types of porous silicon (PSi) morphology are used for the deposition procedure. On the one hand microporous silicon offering luminescence in the visible range is utilized as template material. It offers a branched morphology with a structure size between 2 and 5 nm. In this case not only the magnetic response is investigated but also the influence of the metal filling on the optical properties. On the other hand mesoporous and macroporous silicon in it's low pore regime is employed which offers straight pores with diameters up to 90 nm. In this case the magnetic response strongly depends on the size, the geometry and the spatial distribution of the metal deposits within the pores. A crucial role plays also the morphology of the porous silicon, especially the distance between adjacent pores which is an important parameter regarding magnetic interactions.

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“…The pore-diameter is tunable in a regime from about 20 nm up to a few hundred nanometers. In the last decade, magnetic materials such as Ni, Co, and Fe have been deposited within this kind of templates and the resulting magnetic properties have been investigated intensely (Ramazani et al, 2012;Zhang et al, 2013). Recently, porous InP membranes have been employed for the deposition of magnetic metals whereas the deposition process has been examined by FFT-impedance spectroscopy (Gerngross et al, 2014).…”

Section: Self-organized Porous Templates For Metal Depositionmentioning

confidence: 99%

Physical Properties of Semiconducting/Magnetic Nanocomposites

Granitzer

Rumpf

2015

Front. Mater.

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In this review, the fabrication of porous silicon/magnetic nanocomposite materials and their physical properties are elucidated. Especially, the investigation of the presented systems with respect to their magnetic properties is reported. Furthermore, the influence of the semiconducting matrix on the properties of the nanocomposites is highlighted. The main focus will be put on silicon used as template material. In general, the nanocomposite systems are fabricated in a two-step process, first by anodization of a silicon wafer to achieve porous silicon structures, and second by electrodeposition of a magnetic material into the pores. The morphology of the porous silicon template offers straight pores, grown perpendicular to the wafer surface. The magnetic nanostructures deposited within the pores lead to specific properties of the composite dependent on their size and shape. Due to their mutual arrangement, magnetic coupling between these structures can occur, whereas, coupling between adjacent pores depends on the porous silicon morphology. In the first section, different types of such template/metal systems are reviewed and second an experimental part follows implying the porous silicon formation as well as the subsequent metal deposition process. Third, the magnetic and optical properties of the systems are described. In the fourth chapter, the influence of the semiconducting matrix on these properties is elucidated and finally some prospects and conclusions are addressed.

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Properties of magnetic nickel/porous-silicon composite powders

Cited by 16 publications

References 33 publications

Magnetic Filling of Microporous Silicon: An Interlink Between Optical and Magnetic Behavior

Magnetic Filling of Microporous Silicon: An Interlink Between Optical and Magnetic Behavior

Metal Filled Nanostructured Silicon With Respect to Magnetic and Optical Properties

Physical Properties of Semiconducting/Magnetic Nanocomposites

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