Patent ID: 11963458
Assignee: TOHOKU UNIVERSITY
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 6:
7. A method for manufacturing a magnetic tunnel junction element, the method comprising:
sequentially laminating a magnetic tunnel junction film (M) including at least a reference layer, a tunnel barrier layer, and a recording layer, a first protection layer, a second protection layer, a non-magnetic insertion layer, and a hard mask layer;
annealing the laminated film;
laminating a sacrificial layer including at least Si on the hard mask layer subjected to annealing;
forming a photoresist having, on a part of the sacrificial layer, a processed pattern shape of the magnetic tunnel junction film (M) in a top view;
performing etching using the photoresist as a mask and processing the sacrificial layer;
performing etching using the sacrificial layer as a mask and processing the hard mask layer;
performing etching using the hard mask layer as a mask and processing the magnetic tunnel junction film (M); and
removing the sacrificial layer,
wherein:
the reference layer includes a ferromagnetic body,
the tunnel barrier layer includes O,
the recording layer includes a ferromagnetic body including at least any of Co, Fe, or Ni,
the first protection layer includes O,
the second protection layer includes at least one from the group consisting of Ru, Co, Fe, CoB, FeB, CoFe, or CoFeB,
the non-magnetic insertion layer includes at least one from the group consisting of Ta, Nb, Mo, Hf, W, or Pt, and a film thickness of the non-magnetic insertion layer is 1 nm or more, and 10 nm or less,
the hard mask layer is a metal material including Ti or N, and
a magnetization direction of each of the reference layer and the recording layer is perpendicular to a film surface.