| 摘要 |
PROBLEM TO BE SOLVED: To provide a substrate for a magnetic recording medium using a silicon substrate provided with a surface shape showing satisfactory floating characteristics and formed by incorporating adequate irregularities to the silicon substrate. SOLUTION: The silicon substrate is subjected to a chemical etching treatment using an etchant containing an aqueous alkali solution and a surfactant to form the irregularities on the surface thereof. The aqueous alkali solution contains potassium hydroxide or sodium hydroxide and the concentration of an alkali component in the etchant is in the range of 1 to 60 mass%. COPYRIGHT: (C)2006,JPO&NCIPI
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