Patent ID: 7253995
Filing Date: 2007-08-07
Classification: B82Y,G11B

Abstract:
1. A magnetic head, comprising: a first electrode layer; a first ferromagnetic electrode pair having a first ferromagnetic electrode layer that is stacked on one end of the first electrode layer through a first insulating layer, and a second ferromagnetic electrode layer that is stacked on the other end of the first electrode layer through a second insulating layer; and a second ferromagnetic electrode pair having a third ferromagnetic electrode layer that is stacked on one end of the first electrode layer through a third insulating layer, and a fourth ferromagnetic electrode layer that is stacked on one end of the first electrode layer through a fourth insulating layer; wherein the second ferromagnetic electrode pair intersects with a current that flows between the first ferromagnetic electrode pair; wherein the current is allowed to flow between the first ferromagnetic electrode pair through the first electrode layer to accumulate spin electrons in the first electrode layer; wherein a direction of magnetization of the fourth ferromagnetic electrode layer changes upon application of an external magnetic field; and wherein a coercive force of the fourth ferromagnetic electrode layer is smaller than a coercive force of the first and third ferromagnetic electrode layers.