Patents by Inventor Ursula Ebels
Ursula Ebels has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 8922285Abstract: The invention relates to a radiofrequency oscillator which incorporates: a spin-polarized electric current magnetoresistive device (6), a terminal (18) for controlling the frequency or amplitude of the oscillating signal, a servo loop (34) connected between the output terminal and the control terminal for applying a control signal to the control terminal in order to slave a characteristic of the oscillating signal to a reference value, the servo loop (34) comprising: a sensor (36) of the amplitude of the oscillating signal oscillations, and a comparator (38) capable of generating the control signal according to the measured amplitude and the reference value.Type: GrantFiled: March 1, 2011Date of Patent: December 30, 2014Assignees: Commissariat à l'énergie atomique et aux énergies alternatives, Centre National de la Recherche ScientifiqueInventors: Dimitri Houssameddine, Bertrand Delaet, Marie-Claire Cyrille, Ursula Ebels, Michael Quinsat
-
Patent number: 8823460Abstract: The invention relates to a radiofrequency oscillator which incorporates: a spin-polarized electric current magnetoresistive device (6) for generating an oscillating signal at an oscillation frequency on an output terminal (10), and a terminal (18) for controlling the frequency or amplitude of the oscillating signal, and a feedback loop (44) comprising an amplifier (46) provided with: an input connected to the output terminal (10) of the magnetoresistive device (6) so as to amplify the portion of an oscillating signal detected at the output terminal, and an output connected to the control terminal (18) so as to inject onto said control terminal the amplified portion of the oscillating signal which is phase-related to the oscillating signal generated at the output terminal.Type: GrantFiled: March 1, 2011Date of Patent: September 2, 2014Assignee: Commissariat a l'energie atomique et aux energies alternativesInventors: Dimitri Houssameddine, Bertrand Delaet, Marie-Claire Cyrille, Ursula Ebels, Michael Quinsat
-
Patent number: 8766733Abstract: A radiofrequency oscillator comprises: a free layer (4), a current injector (6) for injecting spin-polarized current into the free layer, this injector having a spin-polarized current injection face (16) directly in contact with the free layer, a magnetoresistive contact (8) having a measurement face (26) directly in contact with the free layer, in order to form, in combination with the free layer, a tunnel junction for measuring the precession of the magnetization of the free layer, a conducting pad (30) directly in contact with the free layer in order to make an electrical current flow through the injector without passing through the magnetoresistive contact. At least part of the measurement face (26) and part of the injection face (16) are placed facing each other on each side of the free layer (4).Type: GrantFiled: December 20, 2010Date of Patent: July 1, 2014Assignees: Commissariat a l'energie atomique et aux energies alternatives, Centre National de la Recherche ScientifiqueInventors: Marie Claire Cyrille, Bertrand Delaet, Ursula Ebels, Dimitri Houssameddine
-
Patent number: 8655302Abstract: A demodulator of an FM signal modulated about a carrier frequency with a modulation frequency has an RF oscillator configured to be synchronized, under identical conditions of operation, with oscillations at first and second frequencies used in the FM signal to encode respective pieces of information. The oscillator has a magnetoresistive device; and a low-pass filter connected to an output electrode of the magnetoresistive device to filter an oscillating signal, generated by the oscillator and to a rendering terminal to provide, as a demodulated electrical signal, the filtered signal, the cut-off frequency fc at ?3 dB of this filter being strictly lower than the frequency and higher than the modulation frequency.Type: GrantFiled: April 18, 2012Date of Patent: February 18, 2014Assignee: Commissariat a l'Energie Atomique et aux Energies AlternativesInventors: Michaël Quinsat, Marie-Claire Cyrille, Ursula Ebels, Jean-Philippe Michel
-
Patent number: 8577320Abstract: An oscillation detector having an RF oscillator configured to be synchronized with a first frequency and a comparator for distinguishing the synchronized state from the non-synchronized state of the radiofrequency oscillator on the basis of an oscillating signal produced by the radiofrequency oscillator and indicating the presence of oscillations in a frequency band around the first frequency in response to identifying the synchronized state and, in alternation, indicating the absence of oscillations in this frequency band otherwise.Type: GrantFiled: April 19, 2012Date of Patent: November 5, 2013Assignee: Commissariat a l'energie et aux energies alternativesInventors: Michaël Quinsat, Marie-Claire Cyrille, Ursula Ebels, Jean-Philippe Michel, Michaël Pelissier, Patrick Villard, Mykhailo Zarudniev
-
Patent number: 8542072Abstract: A radio-frequency oscillator incorporates a magnetoresistive device within which an electron current is able to flow. The device includes a stack including: a magnetic trapped layer, the magnetization of which is of substantially fixed direction; a magnetic free layer; and a non-magnetic intermediate layer-interposed between the free layer and the trapped layer. The oscillator also includes a mechanism capable of making an electron current flow in the layers constituting the stack and in a direction perpendicular to the plane which contains the layers. At least the free layer is devoid of any material at its center. The electron current density flowing through the stack is capable of generating a magnetization in the free layer in a micromagnetic configuration in the shape of a skewed vortex flowing in the free layer around the center of the free layer.Type: GrantFiled: September 26, 2011Date of Patent: September 24, 2013Assignee: Commissariat a l'Energie Automique et aux Energies AlternativesInventors: Bernard Dieny, Marie-Claire Cyrille, Ursula Ebels, Liliana Prejbeanu
-
Publication number: 20130057357Abstract: The invention relates to a radiofrequency oscillator which incorporates: a spin-polarized electric current magnetoresistive device (6) for generating an oscillating signal at an oscillation frequency on an output terminal (10), and a terminal (18) for controlling the frequency or amplitude of the oscillating signal, and a feedback loop (44) comprising an amplifier (46) provided with: an input connected to the output terminal (10) of the magnetoresistive device (6) so as to amplify the portion of an oscillating signal detected at the output terminal, and an output connected to the control terminal (18) so as to inject onto said control terminal the amplified portion of the oscillating signal which is phase-related to the oscillating signal generated at the output terminal.Type: ApplicationFiled: March 1, 2011Publication date: March 7, 2013Applicants: Centre national de la Recherche Scientifique, Commissariat a l'energie atomique et aux energies alternativesInventors: Dimitri Houssameddine, Michael Quinsat, Bertrand Delaet, Marie-Claire Cyrille, Ursula Ebels
-
Publication number: 20130057356Abstract: The invention relates to a radio frequency oscillator which incorporates: a spin-polarized electric current magnetoresistive device (6), a terminal (18) for controlling the frequency or amplitude of the oscillating signal, a servo loop (34) connected between the output terminal and the control terminal for applying a control signal to the control terminal in order to slave a characteristic of the oscillating signal to a reference value, the servo loop (34) comprising: a sensor (36) of the amplitude of the oscillating signal oscillations, and a comparator (38) capable of generating the control signal according to the measured amplitude and the reference value.Type: ApplicationFiled: March 1, 2011Publication date: March 7, 2013Applicants: Centre national de la Recherche Scientifique, Commissariat a I'energie atomique et aux energies alternativesInventors: Dimitri Houssameddine, Michael Quinsat, Bertrand Delaet, Marie-Claire Cyrille, Ursula Ebels
-
Publication number: 20130002362Abstract: A radiofrequency oscillator comprises: a free layer (4), a current injector (6) for injecting spin-polarized current into the free layer, this injector having a spin-polarized current injection face (16) directly in contact with the free layer, a magnetoresistive contact (8) having a measurement face (26) directly in contact with the free layer, in order to form, in combination with the free layer, a tunnel junction for measuring the precession of the magnetization of the free layer, a conducting pad (30) directly in contact with the free layer in order to make an electrical current flow through the injector without passing through the magnetoresistive contact. At least part of the measurement face (26) and part of the injection face (16) are placed facing each other on each side of the free layer (4).Type: ApplicationFiled: December 20, 2010Publication date: January 3, 2013Applicants: Centre National de la Recherche Scientifique, Commissariat a L'energie atomique et aux energies alternativesInventors: Marie Claire Cyrille, Bertrand Delaet, Ursula Ebels, Dimitri Houssameddine
-
Patent number: 8329049Abstract: The present invention relates to a method of fabricating a nanostructure, comprising the following steps: prestructuring a substrate (1) adapted to receive the nanostructure to form a nanorelief (2) on the substrate, the nanorelief having flanks (4) extending from a bottom (1a) of the substrate and a top face (3) extending from said flanks, and then depositing on the substrate pre-structured in this way a single layer or multilayer coating intended to form the nanostructure; and further comprising: adding to the prestructured substrate or to the coating a separation layer adapted to enable separation of the coating and the substrate by external action of mechanical, thermomechanical or vibratory type; and exerting this external action on the substrate and/or the coating to recover selectively a top portion of the coating by separating it from the top face of the nanorelief so that this top portion constitutes some or all of the nanostructure.Type: GrantFiled: June 26, 2007Date of Patent: December 11, 2012Assignee: Commissariat a l'Energie AtomiqueInventors: Ursula Ebels, Bernard Dieny, Dominique Lestelle, Eric Gautier
-
Publication number: 20120268172Abstract: An oscillation detector having an RF oscillator configured to be synchronized with a first frequency and a comparator for distinguishing the synchronized state from the non-synchronized state of the radiofrequency oscillator on the basis of an oscillating signal produced by the radiofrequency oscillator and indicating the presence of oscillations in a frequency band around the first frequency in response to identifying the synchronized state and, in alternation, indicating the absence of oscillations in this frequency band otherwise.Type: ApplicationFiled: April 19, 2012Publication date: October 25, 2012Applicant: Commissariat à l'énergie atomique et aux énergies alternativesInventors: Michaël Quinsat, Marie-Claire Cyrille, Ursula Ebels, Jean-Philippe Michel, Michaël Pelissier, Patrick Villard, Mykhailo Zarudniev
-
Publication number: 20120270515Abstract: A demodulator of an FM signal modulated about a carrier frequency with a modulation frequency has an RF oscillator configured to be synchronized, under identical conditions of operation, with oscillations at first and second frequencies used in the FM signal to encode respective pieces of information. The oscillator has a magnetoresistive device; and a low-pass filter connected to an output electrode of the magnetoresistive device to filter an oscillating signal, generated by the oscillator and to a rendering terminal to provide, as a demodulated electrical signal, the filtered signal, the cut-off frequency fc at ?3 dB of this filter being strictly lower than the frequency and higher than the modulation frequency.Type: ApplicationFiled: April 18, 2012Publication date: October 25, 2012Applicant: COMMISSARIAT A IENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESInventors: Michaël Quinsat, Marie-Claire Cyrille, Ursula Ebels, Jean-Philippe Michel
-
Patent number: 8279666Abstract: A magnetic device includes a magnetic reference layer with a fixed magnetization direction located either in the plane of the layer or perpendicular to the plane of the layer, a magnetic storage layer with a variable magnetization direction, a non-magnetic spacer separating the reference layer and the storage layer and a magnetic spin polarizing layer with a magnetization perpendicular to that of the reference layer, and located out of the plane of the spin polarizing layer if the magnetization of the reference layer is directed in the plane of the reference layer or in the plane of the spin polarizing layer if the magnetization of the reference layer is directed perpendicular to the plane of the reference layer. The spin transfer coefficient between the reference layer and the storage layer is higher than the spin transfer coefficient between the spin polarizing layer and the storage layer.Type: GrantFiled: May 26, 2010Date of Patent: October 2, 2012Assignees: Institut Polytechnique de Grenoble, Le Centre National de la Recherche Scientifique, Le Commissariat a l'Energie Atomique et aux Energies AltenativesInventors: Bernard Dieny, Cristian Papusoi, Ursula Ebels, Dimitri Houssameddine, Liliana Buda-Prejbeanu, Ricardo Sousa
-
Publication number: 20120075031Abstract: A radio-frequency oscillator incorporates a magnetoresistive device within which an electron current is able to flow. The device includes a stack including: a magnetic trapped layer, the magnetization of which is of substantially fixed direction; a magnetic free layer; and a non-magnetic intermediate layer-interposed between the free layer and the trapped layer. The oscillator also includes a mechanism capable of making an electron current flow in the layers constituting the stack and in a direction perpendicular to the plane which contains the layers. At least the free layer is devoid of any material at its center. The electron current density flowing through the stack is capable of generating a magnetization in the free layer in a micromagnetic configuration in the shape of a skewed vortex flowing in the free layer around the center of the free layer.Type: ApplicationFiled: September 26, 2011Publication date: March 29, 2012Inventors: Bernard Dieny, Marie-Claire Cyrille, Ursula Ebels, Liliana Prejbeanu
-
Patent number: 8063709Abstract: The invention relates to a method of operating a spin-transfer torque structure to generate voltage oscillations, said structure comprising a first layer of magnetic material having a fixed magnetization vector, a spacer of non magnetic material and a second layer of magnetic material having a free magnetization vector. The method includes the application of a current (jop) through said structure and a magnetic field (Hext) in the plane of the second layer. It makes use of a region of bistability and hysteretic behaviour to trigger and stop the voltage oscillations.Type: GrantFiled: February 21, 2007Date of Patent: November 22, 2011Assignee: Centre National de la Recherche ScientifiqueInventors: Ioana Firastrau, Ursula Ebels, Bernard Dieny
-
Publication number: 20110109397Abstract: This radiofrequency oscillator has a free layer (10) and/or a reference layer formed by a stacking of at least three ferromagnetic or ferrimagnetic layers coupled to one another by an RKKY (Ruderman-Kittel-Kasuya-Yosida) coupling and among which at least two sub-layers are magnetically coupled to each other by an antiferromagnetic RKKY coupling.Type: ApplicationFiled: November 1, 2010Publication date: May 12, 2011Applicants: Commissariat a I'energie atomique et aux energies alternatives, Centre National De La Researche ScientifiqueInventors: Bertrand Delaet, Ursula Ebels
-
Publication number: 20110007560Abstract: A magnetic device includes a magnetic reference layer with a fixed magnetisation direction located either in the plane of the layer or perpendicular to the plane of the layer, a magnetic storage layer with a variable magnetisation direction, a non-magnetic spacer separating the reference layer and the storage layer and a magnetic spin polarising layer with a magnetisation perpendicular to that of the reference layer, and located out of the plane of the spin polarising layer if the magnetisation of the reference layer is directed in the plane of the reference layer or in the plane of the spin polarising layer if the magnetisation of the reference layer is directed perpendicular to the plane of the reference layer. The spin transfer coefficient between the reference layer and the storage layer is higher than the spin transfer coefficient between the spin polarising layer and the storage layer.Type: ApplicationFiled: May 26, 2010Publication date: January 13, 2011Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVESInventors: Bernard Dieny, Cristian Papusoi, Ursula Ebels, Dimitri Houssameddine, Liliana Buda-Prejbeanu, Ricardo Sousa
-
Publication number: 20100039181Abstract: The invention relates to a method of operating a spin-transfer torque structure to generate voltage oscillations, said structure comprising a first layer of magnetic material having a fixed magnetization vector, a spacer of non magnetic material and a second layer of magnetic material having a free magnetization vector. The method includes the application of a current (jop) through said structure and a magnetic field (Hext) in the plane of the second layer. It makes use of a region of bistability and hysteretic behaviour to trigger and stop the voltage oscillations.Type: ApplicationFiled: February 21, 2007Publication date: February 18, 2010Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUEInventors: Ioana Firastrau, Ursula Ebels, Bernard Dieny
-
Publication number: 20100003421Abstract: The present invention relates to a method of fabricating a nanostructure, comprising the following steps: prestructuring a substrate (1) adapted to receive the nanostructure to form a nanorelief (2) on the substrate, the nanorelief having flanks (4) extending from a bottom (1a) of the substrate and a top face (3) extending from said flanks, and then depositing on the substrate pre-structured in this way a single layer or multilayer coating intended to form the nanostructure; and further comprising: adding to the prestructured substrate or to the coating a separation layer adapted to enable separation of the coating and the substrate by external action of mechanical, thermomechanical or vibratory type; and exerting this external action on the substrate and/or the coating to recover selectively a top portion of the coating by separating it from the top face of the nanorelief so that this top portion constitutes some or all of the nanostructure.Type: ApplicationFiled: June 26, 2007Publication date: January 7, 2010Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUEInventors: Ursula Ebels, Bernard Dieny, Dominique Lestelle, Eric Gautier