Magnetic properties of electroless fine Co-P particles

Chekanova, L. A.; Денисова, Е. А.; Исхаков, Р. С.

doi:10.1109/20.619553

Cited by 19 publications

(13 citation statements)

References 5 publications

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“…The initial Al 2 O 3 /Co(P) composite particles consist of granular Al 2 O 3 cores (50 mass %), surrounded by a shell of Co 95 P 5 particles. The Co-P particles were deposited on Al 2 O 3 surface by electroless plating [14,15] as described in our previous study [16]. The average size of Al 2 O 3 granules is about 300 nm.…”

Section: Methodsmentioning

confidence: 99%

Structure and magnetism in ball-milled core-shell Al2O3@Co particles

Kuzovnikova¹,

Комогорцев

Денисова

et al. 2019

Materials Today: Proceedings

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The core-shell Al 2 O 3 @Co particles were prepared by the ball-milling of the composite Al 2 O 3-Co particles synthesized by electroless reduction. During the ball-milling process, both, the core-shell particle size and the ratio of hcp/fcc phases changed. To perform a phase analysis of the cobalt shell we used an approach based on the magnetic measurements. The use of Al 2 O 3-Co composite particles as the precursors for the ball milling significantly shortens the time needed for a change in the phase composition of cobalt.

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Section: Methodsmentioning

confidence: 99%

Structure and magnetism in ball-milled core-shell Al2O3@Co particles

Kuzovnikova¹,

Комогорцев

Денисова

et al. 2019

Materials Today: Proceedings

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“…When the phosphorous content in Co(P) film exceeds 12 at.%, the electroless Co(P) layers have an amorphous structure. 16 The amorphous structure starts to crystallize into a-Co at ;290°C, and orthorhombic crystals of Co 2 P appear at 420°C. 15 Thermal treatment of the present experiment occurred at 250°C, so that the two types of Co crystals would not appear in the same experiment.…”

Section: Composition Analysis Of Electroless Co(p) Layermentioning

confidence: 99%

Investigation of electroless cobalt-phosphorous layer and its diffusion barrier properties of Pb-Sn solder

Liang

Yen

Hsieh

2006

Journal of Elec Materi

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The capability of a cobalt-phosphorous [Co(P)] layer, which was grown via the electroless plating process, to serve as the diffusion barrier of lead-tin (PbSn) solder was investigated in this work. The Auger electron spectroscopy (AES) and energy dispersive spectrometry (EDX) indicated that the phosphorous contents in Co(P) films decrease with increasing film thickness and that the average contents are no less than 8.7 at.% for the specimens prepared in this work. X-ray diffraction in conjunction with composition analyses revealed that the electroless Co(P) layer was a mixture of amorphous and nanocrystalline structures; however, the AES depth profile and subsequent analyses indicated that the first-formed Co(P) layer should be amorphous because it contains as much as 18 at.% P. This implied a good barrier capability for electroless Co(P) because, as revealed by EDX line scan, the Sn and Cu atoms could not penetrate the Co(P) layer after the PbSn/Cu/Co(P)/Cu/Ti/Si sample was subjected to annealing at 250°C in a forming gas ambient for 24 h. The fact that Sn and Cu underlayers could not penetrate the Co layer after such a liquid-state annealing step was evidence that the Co(P) layer may simultaneously serve as a diffusion-barrier interlayer dielectric and as an under-bump metallization for flip-chip copper (Cu) ICs.

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“…Для анализа особенностей магнитного гистерезиса в данных частицах мы выполнили микромагнитное моделирование петель магнитного гистерезиса в частицах ядро-оболочка в программном пакете OOMMF [18]. Параметры микромагнитной проблемы выбирались соответствующими экспериментальным параметрам частиц либо покрытий CoP [19][20][21]. Константы обменного взаимодействия и магнитной анизотропии согласно [17]: A = 1 • 10 −6 erg/cm, K = 4 • 10 5 erg/cm 3 , M s = 1000 G. Важной особенностью этих расчетов является то, что константа анизотропии в данном случае относится не ко всей частице, а к кристаллитам, из которых состоит частица либо покрытие.…”

Section: экспериментunclassified

“…3). В работах [17,19,24] показано, что структура частиц Со(P) полученных химическим осаждением, представляет собой гетерофазную смесь метастабильных твердых растворов Со(P) с аморфной структурой, ГЦК и ГПУ. Магнитные свойства этих фаз существенно различны, поэтому свойства частиц меняются вслед за изменениями фазового состава от размера частиц и концентрации фосфора [17].…”

Section: магнитные свойства частицunclassified

Ослабление Диполь-Дипольного Взаимодействия В Ансамблях Микросфер Кобальта С Немагнитным Ядром

Комогорцев,

Чеканова,

Шабанова

et al. 2022

Физика Твердого Тела

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Magnetic microspheres with nonmagnetic acrylic glass core were fabricated using electroless deposition. There are favorable conditions for magnetic flux closure within each particle. As a result, the dipole-dipole interaction in the powder of such microspheres is reduced drastically. This is the key difference between powders of magnetic microspheres and powders of full magnetic spherical particles witch behavior is significantly affected by the dipole-dipole interaction. The magnetic hysteresis in the cobalt microspheres with nonmagnetic core is significantly large then in the full cobalt particles produced using the same technique.

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Magnetic properties of electroless fine Co-P particles

Cited by 19 publications

References 5 publications

Structure and magnetism in ball-milled core-shell Al2O3@Co particles

Structure and magnetism in ball-milled core-shell Al2O3@Co particles

Investigation of electroless cobalt-phosphorous layer and its diffusion barrier properties of Pb-Sn solder

Ослабление Диполь-Дипольного Взаимодействия В Ансамблях Микросфер Кобальта С Немагнитным Ядром

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