Patent ID: 8472243

Claim:
A storage apparatus comprising: a cell array including a plurality of storage devices arranged to form an array, each of the storage devices including a storage layer for storing information as a state of magnetization of a magnetic substance; a fixed-magnetization layer having a fixed magnetization direction; and a tunnel insulation layer between the storage layer and the fixed-magnetization layer, the storage device being configured such that, in order to write information on the storage layer, a write current is generated to flow in a layer-stacking direction of the storage layer and the fixed-magnetization layer to change a direction of magnetization of the storage layer, wherein, the cell array is divided into a plurality of cell blocks including a first cell block and a second cell block, and a thermal stability of the storage layer of any particular one of the storage devices has a value peculiar to a corresponding cell block that includes the particular storage device, a storage layer of a storage device included in the first cell block having a first thermal-stability value peculiar to the first cell block and a storage layer of a storage device included in the second cell block having a second thermal-stability value peculiar to the second cell block, the first thermal-stability value peculiar to the first cell block being different from the second thermal-stability value peculiar to the second cell block.