Patent ID: 11871681
Assignee: TDK CORPORATION
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A magnetoresistance effect element comprising:
an underlayer;
a first ferromagnetic metal layer;
a second ferromagnetic metal layer; and
a tunnel barrier layer that is sandwiched between the first and second ferromagnetic metal layers,
wherein the tunnel barrier layer has a spinel structure and comprises:
at least one lattice-matched portion that is lattice-matched with both of the first ferromagnetic metal layer and the second ferromagnetic metal layer; and
at least one lattice-mismatched portion that is not lattice-matched with at least one of the first ferromagnetic metal layer and the second ferromagnetic metal layer, and

the underlayer is made of
a nitride containing at least one element selected from the group consisting of Ti, Zr, Nb, V, Hf, Ta, Mo, W, B, Al and Ce;
a layer having a stacked structure with a combination of a nitride layer containing at least one element selected from the group consisting of Ti, Zr, Nb, V, Hf, Ta, Mo, W, B, Al and Ce and a layer containing at least one element selected from the group consisting of Al, Cr, Fe, Co, Rh, Pd, Ag, Ir, Pt, Au, Mo, and W.