SPACER, LAMINATE OF SUBSTRATES, SUBSTRATE PRODUCTION METHOD, AND METHOD FOR PRODUCING SUBSTRATE FOR MAGNETIC DISK

The area of a spacer that is to be provided between the adjacent substrates in a laminate including a plurality of substrates to keep the adjacent 5 substrates apart from each other is smaller than those ofthe stacked substrates. When pressure is released to bring the laminate obtained by providing the spacers between the substrates from a pressed state in which 0.60 MPa of pressure is applied to the laminate in the stacking direction into a non-pressed state, an amount ofchange AW in thickness per spacer that is calculated from a 10 change in the thickness ofthe laminate due to the release of pressure is 30 pm or less.

The area of a spacer that is to be provided between the adjacent substrates in a laminate including a plurality of substrates to keep the adjacent 5 substrates apart from each other is smaller than those ofthe stacked substrates. When pressure is released to bring the laminate obtained by providing the spacers between the substrates from a pressed state in which 0.60 MPa of pressure is applied to the laminate in the stacking direction into a non-pressed state, an amount ofchange AW in thickness per spacer that is calculated from a 10 change in the thickness ofthe laminate due to the release of pressure is 30 pm or less.