Patent ID: 6558481
Filing Date: 2003-05-06
Classification: H01F

Abstract:
A method of controlling the magnetic properties of a ferromagnetic samarium substance having a composition including samarium from which said magnetic properties mainly arise, comprising the steps of:(a) adjusting said composition to maintain ferromagnetic alignment of electron spin and to have a spin-orbital compensation property at a specific temperature, characterized by little or no magnetization due to the compensation between the two parts of the magnetization originating from orbital magnetic moment and spin magnetic moment; (b) aligning the electron spin in said ferromagnetic samarium substance over a macroscopic range in a temperature range, where said ferromagnetic samarium substance has a macroscopic magnetization; and (c) setting temperature to be said spin-orbital compensation temperature and setting an external magnetic field to be nearly zero so as to achieve the ferromagnetic alignment of the electron spin in said ferromagnetic samarium substance over a macroscopic range with little or no magnetic field.