Effect of Magnetic Field on Copper Electroplating-Application to Through-Hole Plating

Morimoto, Ryoichi; Yazawa, Sadaharu; Aogaki, Ryoichi; Sugiyama, Atsushi; Saitou, Makoto

doi:10.4139/sfj.59.408

Cited by 1 publication

(2 citation statements)

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“…This kind of convection has been reported by Aogaki et al in copper electrodeposition. (19,20) Bund et al also reported this magnetic convection because of the gradient of magnetic susceptibility in the solution, especially between the bulk and Nernst layer in copper electrodeposition. (17) In this experiment, during the porous growth, the micro MHD affects the ionic migration, O 2− , OH − , Al 3+ , during oxide dissolution for pore growth in a circular manner along the pore channel.…”

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confidence: 99%

“…(18) The additional effect, called micro-MHD, was also observed in the electrodeposition of copper, which resulted in numerous microscopic vortices in the vicinity of the precipitation interface on the surface of the cathode and suppressed crystal growth of electrodeposited Cu on the cathode. (19,20) Meanwhile, there remain few reports of the application of a magnetic field to anodic oxidation. (21) In this study, the effect of magnetic field imposition on the surface morphology of anodized oxide film was investigated for various magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Applied Vertical Magnetic Field on Anodizing Behavior of Aluminum to Produce Porous Anodic Aluminum Oxide

2016

Sensors and Materials

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Porous anodic aluminum oxide (AAO) film has potential to be a candidate material in nanofabrication, membranes, and humidity sensors. Anodic oxidation is typically preferred to fabricate AAO because it is an inexpensive and controllable process. In this study, a different approach to fabricating AAO by a single step anodizing in oxalic acid assisted by externally applied vertical magnetic field, is adopted. The anodizing experiments were conducted in 0.3 M oxalic acid aqueous solution as electrolyte. The vertical magnetic field was generated by a superconducting magnet with the range of 1 to 5 T. The results of the experiment showed that the magnetic field can promote the anodic dissolution of Al 3+ ions, and hence increase the AAO thickness by twice as much as without one. However, the pore diameter was decreased by the increased magnitude of the magnetic field. Interestingly, the AAO formed by anodizing with the vertical magnetic field showed a vertically aligned cylindrical structure of the pores. On the other hand, AAO formed by anodizing without the magnetic field showed random growth of pore structure. The density of AAO pores was also increased by the increase in magnitude of the magnetic field. The deep and straight structure with high density and porosity of AAO is advantageous for further application as template and sensor materials.

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Section: Introductionmentioning

confidence: 99%