Patent ID: 6929957
Filing Date: 2005-08-16
Classification: G11C,H01L

Abstract:
1. A magnetically shielded magnetic tunnel junction (MTJ) cell, comprising: a substrate; a magnetic tunnel junction (MTJ) cell formed on the substrate, said cell having a top and sides and the horizontal cross-section of said cell having a certain geometric shape; a first layer of insulation formed conformally over the sides of said cell and at least a portion of the substrate surrounding said cell; a layer of magnetically shielding material formed covering the portion of said insulation on the substrate and abutting the portion of said insulation on the sides of said cell, said shielding material being thereby electrically insulated from said cell and said substrate by said insulation; and a second layer of insulation formed over the magnetic shield, said layer not contacting the top of the MTJ cell; and said MTJ cell having a first first magnetization direction; and said shielding material having a second magnetization direction; and the magnetization of said MTJ cell being maintained by magnetostatic coupling to said magnetically shielding material.