Thales

Henri Jaffres

Julie Grollier

Vincent Cros

Frédéric Nguyen Van Dau

Alain Friederich

Albert Fert

Jean-Marie George

Frédéric Petroff

Daniel Lacour

Frédérich Nguyen Van Dau

The disclosure relates to a device for controlling magnetization reversal in a controlled ferromagnetic system such as a magnetic memory element, without using an external magnetic field, wherein it comprises between two flat electrodes a magnetic control part comprising, starting from the first electrode, a first ferromagnetic layer, a non-magnetic layer, and a second ferromagnetic layer, and the second of said two flat electrodes, the thickness of said second ferromagnetic layer being less than that of said first layer, and the thickness of said second electrode being sufficiently small to enable magnetic coupling between said second ferromagnetic layer and the system controlled by the control device.

Control device for reversing the direction of magnetisation without an external magnetic field

The invention relates to magnetic field sensors in which magnetoresistance is used as the physical phenomenon for detecting and measuring the magnetic field. It consists in producing a stack comprising a first ferromagnetic layer (), an insulating layer (), a second ferromagnetic layer () and an antiferromagnetic layer (). The two ferromagnetic layers exhibit crossed magnetic anisotropies and form with the insulating layer a tunnel junction. The anisotropy of the first layer is obtained from the shape energy of the substrate on which this first layer rests and which is slightly misoriented with respect thereto. The anisotropy of the second layer is obtained by the action of the antiferromagnetic layer.

Magnetic field sensor using magnetoresistance and method for making same

Variable capacitive device, such as a capacitor, controllable in voltage Vc including at least one first armature (L) and one second armature (R), the armatures being separated by an insulation layer (D) including several conducting aggregates separated from each other. The use of the capacitor according to the invention in a resonant circuit.

Variable capacitor voltage-controllable by use of coulomb blocking phenomenon

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Orsay, France

Henri Jaffres