Figure 2From: Porous silicon/Ni composites of high coercivity due to magnetic field-assisted etchingMagnetic field-assisted anodized specimen. ( a) Top-view SEM image of a magnetic field-assisted anodized specimen showing pores with an average diameter of 25 nm. ( b) Corresponding image of the cross-sectional region showing the less dendritic growth of the pores.Back to article page