Magnetoresistance effect element and magnetic memory

A magnetoresistance effect element comprising:

• a first non-magnetic layer;
• a first magnetic layer provided adjacent to the first non-magnetic layer and having a magnetization direction which is perpendicular to a film surface;
• a first non-magnetic coupling layer provided adjacent to the first magnetic layer on a side of the first magnetic layer opposite to the first non-magnetic layer;
• a first magnetic insertion layer provided adjacent to the first non-magnetic coupling layer on a side of the first non-magnetic coupling layer opposite to the first magnetic layer;
• a second non-magnetic coupling layer provided adjacent to the first magnetic insertion layer on a side of the first magnetic insertion layer opposite to the first non-magnetic coupling layer;
• a second magnetic layer provided adjacent to the second non-magnetic coupling layer on a side of the second non-magnetic coupling layer opposite to the first magnetic insertion layer and having a magnetization direction which is perpendicular to the film surface;
• a third non-magnetic layer provided adjacent to the second magnetic layer on a side of the second magnetic layer opposite to the second non-magnetic coupling layer;
• a third magnetic layer provided adjacent to the third non-magnetic layer on a side of the third non-magnetic layer opposite to the second magnetic layer and having a magnetization direction which is perpendicular to the film surface;
• a fifth non-magnetic coupling layer provided adjacent to the third magnetic layer on a side of the third magnetic layer opposite to the third non-magnetic layer;
• a fourth magnetic insertion layer provided adjacent to the fifth non-magnetic coupling layer on a side of the fifth non-magnetic coupling layer opposite to the third magnetic layer;
• a sixth non-magnetic coupling layer provided adjacent to the fourth magnetic insertion layer on a side of the fourth magnetic insertion layer opposite to the fifth non-magnetic coupling layer;
• a fourth magnetic layer provided adjacent to the sixth non-magnetic coupling layer on a side of the sixth non-magnetic coupling layer opposite to the fourth magnetic insertion layer and having a magnetization direction which is perpendicular to the film surface;
• and
• a second non-magnetic layer provided adjacent to the fourth magnetic layer on a side of the fourth magnetic layer opposite to the sixth non-magnetic coupling layer, wherein
• the first non-magnetic layer and the second non-magnetic layer are constituted of a layer including O (oxygen);
• the first magnetic layer, the second magnetic layer, the third magnetic layer, and the fourth magnetic layer include at least either Co or Fe;
• the first non-magnetic coupling layer, the second non-magnetic coupling layer, the fifth non-magnetic coupling layer, and the sixth non-magnetic coupling layer include a non-magnetic element consisting of at least one of W, Ta, Hf, Zr, Nb, Mo, V, B;
• the first non-magnetic coupling layer and the second non-magnetic coupling layer has a film thickness of 0.2 nm or more and 1.3 nm or less;
• the first magnetic insertion layer and the fourth magnetic insertion layer include at least Fe and B;
• the first magnetic insertion layer has a film thickness of 0.4 nm or more and 1.0 nm or less;
• the third non-magnetic layer includes an oxide of a non-magnetic element;
• the first magnetic layer and the second magnetic layer are magnetically coupled by a first coupling layer constituted of the first non-magnetic coupling layer, the first magnetic insertion layer and the second non-magnetic coupling layer;
• the second magnetic layer and the third magnetic layer are magnetically coupled by a second coupling layer constituted of the third non-magnetic layer;
• the third magnetic layer and the fourth magnetic layer are magnetically coupled by a third coupling layer constituted of the fifth non-magnetic coupling layer, the fourth magnetic insertion layer and the sixth non-magnetic coupling layer;
• the first magnetic layer and the fourth magnetic layer are magnetically coupled by the first coupling layer, the second coupling layer, and the third coupling layer;
• the first magnetic layer, the first coupling layer, the second magnetic layer, the second coupling layer, the third magnetic layer, the third coupling layer, and the fourth magnetic layer constitute a first recording layer.