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

Claim 0:
1. A magnetic tunnel junction element, comprising:
a reference layer having a magnetization direction that is fixed;
a tunnel barrier layer disposed adjacent to the reference layer;
a recording layer having a magnetization direction that is variable, and disposed adjacent to the tunnel barrier layer on an opposite side thereof to the reference layer;
a first protection layer disposed adjacent to the recording layer on an opposite side thereof to the tunnel barrier layer;
a second protection layer disposed adjacent to the first protection layer on an opposite side thereof to the recording layer;
a non-magnetic insertion layer disposed adjacent to the second protection layer on an opposite side thereof to the first protection layer; and
a hard mask layer disposed in a direct contact with the non-magnetic insertion layer on an opposite side thereof to the second protection 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
the reference layer, the tunnel barrier layer, and the recording layer configure a magnetic tunnel junction film (M) and a magnetization direction of each of the reference layer and the recording layer is perpendicular to a film surface.