応力誘起磁化反転 : 磁場を用いない磁化書込みの方法として(<特集>磁化反転の新たな描像)

概要

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With a view to switching magnetization direction without applying an external magnetic field, use of stress-induced magnetic anisotropy is studied as a driving force for magnetization reversal. A device structure consisting of a magnetostrictive film in contact with a piezoelectric film is assumed so that the stress in the magnetostrictive film is controlled by the applied voltage on the piezoelectric element. While the stress-induced anisotropy can deflect the resultant easy axis of magnetization away from its original direction, bringing the magnetization vector to full reversal is not straightforward. Three different approaches including the authors' proposals are reviewed : (1) rotating the axis of in-plane strain, (2) using magnetic anisotropy with 4-fold symmetry in the film plane, and (3) taking advantage of the precession motion of magnetization.
社団法人日本磁気学会の論文
2005-05-01