Patent ID: 7470925
Filing Date: 2008-12-30
Classification: B82Y,H01F,Y10S

Abstract:
1. A magnetic body composed of non-magnetic material, comprising: quantum dots, each of which has at least one electron to form a localized spin; a barrier potential region having a higher energy than a Fermi energy of an electron in the respective quantum dots and confining the at least one electron within the respective quantum dots; and a conductive electron region including a conductive electron system having an energy lower than an energy of the barrier potential region, wherein the respective quantum dots are disposed separate from one another via the barrier potential region and the conductive electron region to show ferromagnetism based on an interaction between localized spins through the conductive electron region, wherein the quantum dots are spatially arranged in a range that satisfies a condition in which a center-to-center distance between nearest quantum dots is greater than a size of the respective quantum dots along a confinement direction containing the at least one electron and at most 1/π times a Fermi wave length of a conductive electron of the conductive electron region, wherein the respective quantum dots are allowed to have a different size from each other with a fluctuation in a range that the size thereof along the confinement direction containing the at least one electron is less than 1/π times the Fermi wave length of the conductive electron.