Patent ID: 8048686

Claim:
Method for producing a device comprising magnetic blocks resting on a substrate ( 100 ) and which are magnetized in different directions, said method comprising: a) a step of forming, in a stack of one or more layers of antiferromagnetic material and one or more layers of ferromagnetic material resting on a substrate, at least one first block and at least one second block, said blocks being separate, the first block and the second block being longilineal and extending respectively in a first main direction and in a second main direction, the first and the second main direction forming between them a first non-zero angle α, b) a step of annealing said blocks at a temperature greater than the ordering temperature or than the blocking temperature or than the Néel temperature of said antiferromagnetic material, this annealing step additionally comprising, during the annealing, the application of a magnetic field oriented in a direction that forms a second non-zero angle θ with said first and second main directions, and of an intensity that is varied during the annealing, so that during the application of the magnetic field: first of all there is applied a magnetic field of given intensity greater than that of the saturation magnetic field H W of the blocks along their hard magnetization axis, the given intensity is then reduced so that the respective moduli of a projection of the magnetic field in the first main direction and of a projection of the magnetic field in the second main direction are greater than a saturation field value H L of the blocks along their easy magnetization axis, and the respective moduli of a projection of the magnetic field perpendicular to the first main direction and of a projection of the magnetic field perpendicular to the second main direction are lower than a saturation field value H w of the blocks along their hard magnetization axis.