Publications (37)
Spin-Torque Diode Measurements of MgO-Based Magnetic Tunnel Junctions with Asymmetric Electrodes
R. Matsumoto, A. Chanthbouala, J. Grollier +8
We present a detailed study of the spin-torque diode effect in CoFeB/MgO/CoFe/NiFe magnetic tunnel junctions. From the evolution of the resonance frequency with magnetic field at d…
Enhancement of perpendicular magnetic anisotropy and its electric field-induced change through interface engineering in Cr/Fe/MgO
A. KozioÅ-RachwaÅ, T. Nozaki, K. Freindl +3
Recently, perpendicular magnetic anisotropy (PMA) and its voltage control (VC) was demonstrated for Cr/Fe/MgO (Physical Review Applied 5, 044006 (2016)). In this study, we shed a l…
Spin torque resonant vortex core expulsion for an efficient radio-frequency detection scheme
A. S. Jenkins, R. Lebrun, E. Grimaldi +9
Spin-polarised radio-frequency currents, whose frequency is equal to that of the gyrotropic mode, will cause an excitation of the core of a magnetic vortex confined in a magnetic t…
Giant spin accumulation in silicon nonlocal spin-transport devices
A. Spiesser, H. Saito, Y. Fujita +4
Although the electrical injection, transport and detection of spins in silicon have been achieved, the induced spin accumulation was much smaller than expected and desired, limitin…
Nonlinear Electrical Spin Conversion in a Biased Ferromagnetic Tunnel Contact
R. Jansen, A. Spiesser, H. Saito +4
The conversion of spin information into electrical signals is indispensable for spintronic technologies. Spin-to-charge conversion in ferromagnetic tunnel contacts is well-describe…
Enhancement of the transverse non-reciprocal magneto-optical effect
V. Zayets, H. Saito, S. Yuasa +1
The origin and properties of the transverse non-reciprocal magneto-optical (nMO) effect were studied. The transverse nMO effect occurs in the case when light propagates perpendicul…
Coherent microwave generation by spintronic feedback oscillator
Dinesh Kumar, K. Konishi, Nikhil Kumar +9
The transfer of spin angular momentum to a nanomagnet from a spin polarized current provides an efficient means of controlling the magnetization direction in nanomagnets. A unique…
Large microwave generation from d.c. driven magnetic vortex oscillators in magnetic tunnel junctions
A. Dussaux, B. Georges, J. Grollier +10
Spin polarized current can excite the magnetization of a ferromagnet through the transfer of spin angular momentum to the local spin system. This pure spin-related transport phenom…
Parallel pumping of magnetic vortex gyrations in spin-torque nano-oscillators
P. Bortolotti, C. Serpico, E. Grimaldi +8
We experimentally demonstrate that large magnetic vortex oscillations can be parametrically excited in a magnetic tunnel junction by the injection of radio-frequency (rf) currents…
A study of centaur (54598) Bienor from multiple stellar occultations and rotational light curves
J. L. Rizos, E. Fernández-Valenzuela, J. L. Ortiz +40
Centaurs, distinguished by their volatile-rich compositions, play a pivotal role in understanding the formation and evolution of the early solar system, as they represent remnants…
Understanding of phase noise squeezing under fractional synchronization of non-linear spin transfer vortex oscillator
R. Lebrun, A. Jenkins, A. Dussaux +10
We investigate experimentally the synchronization of a vortex based spin transfer oscillator to an external rf current whose frequency is at multiple integers, as well as half inte…
Injection and detection of spin in a semiconductor by tunneling via interface states
R. Jansen, A. M. Deac, H. Saito +1
Injection and detection of spin accumulation in a semiconductor having localized states at the interface is evaluated. Spin transport from a ferromagnetic contact by sequential, tw…
High temperature spin selectivity in a quantum dot qubit using reservoir spin accumulation
R. Jansen, S. Yuasa
Employing spins in quantum dots for fault-tolerant quantum computing in large-scale qubit arrays with on-chip control electronics requires high-fidelity qubit operation at elevated…
Phase locking of vortex based spin transfer oscillators to a microwave current
A. Dussaux, A. V. Khvalkovskiy, J. Grollier +8
Phase locking experiments on vortex based spin transfer oscillators with an external microwave current are performed. We present clear evidence of phase locking, frequency pulling,…
Anomalous scaling of spin accumulation in ferromagnetic tunnel devices with silicon and germanium
S. Sharma, A. Spiesser, S. P. Dash +6
The magnitude of spin accumulation created in semiconductors by electrical injection of spin-polarized electrons from a ferromagnetic tunnel contact is investigated, focusing on ho…
Frequency converter based on nanoscale MgO magnetic tunnel junctions
B. Georges, J. Grollier, V. Cros +9
We observe both dc voltage rectification and frequency conversion that occur when a reference microwave current is injected to a MgO based magnetic tunnel junction (MTJ). The recti…
RF amplification property of the MgO-based magnetic tunnel junction using field-induced ferromagnetic resonance
K. Konishi, D. K. Dixit, A. A. Tulapurkar +6
The radio-frequency (RF) voltage amplification property of a tunnel magnetoresistance device driven by an RF external-magnetic-field-induced ferromagnetic resonance was studied. Th…
Mutual synchronization of spin torque nano-oscillators through a non-local and tunable electrical coupling
R. Lebrun, S. Tsunegi, P. Bortolotti +8
The concept of spin torque driven high frequency magnetization dynamics has opened up the field of spintronics to non-linear physics, potentially in complex networks of dynamical s…
Voltage-induced precessional switching at zero-bias magnetic field in a conically magnetized free layer
R. Matsumoto, T. Nozaki, S. Yuasa +1
Voltage-induced magnetization dynamics in a conically magnetized free layer with an elliptic cylinder shape is theoretically studied on the basis of the macrospin model. It is foun…
Vertical current induced domain wall motion in MgO-based magnetic tunnel junction with low current densities
A. Chanthbouala, R. Matsumoto, J. Grollier +11
Shifting electrically a magnetic domain wall (DW) by the spin transfer mechanism is one of the future ways foreseen for the switching of spintronic memories or registers. The class…
Origin of the spectral linewidth in non linear oscillators based on MgO tunnel junctions
B. Georges, J. Grollier, V. Cros +6
We demonstrate the strong impact of the oscillator agility on the line broadening by studying spin transfer induced microwave emission in MgO-based tunnel junctions with current. T…
Controlling encirclement of an exceptional point using coupled spintronic nano-oscillators
K. Ho, S. Perna, S. Wittrock +8
Exceptional points (EPs), branch singularities parameter space of non-Hermitian eigenvalue manifolds, display unique topological phenomena linked to eigenvalue and eigenvector swit…
Temporal pattern recognition with delayed feedback spin-torque nano-oscillators
M. Riou, J. Torrejon, B. Garitaine +11
The recent demonstration of neuromorphic computing with spin-torque nano-oscillators has opened a path to energy efficient data processing. The success of this demonstration hinged…
Non-linear spin transport in a rectifying ferromagnet/semiconductor Schottky contact
R. Jansen, A. Spiesser, H. Saito +1
The electrical creation and detection of spin accumulation in ferromagnet/semiconductor Schottky contacts that exhibit highly non-linear and rectifying electrical transport is eval…
Neuromorphic Computing through Time-Multiplexing with a Spin-Torque Nano-Oscillator
M. Riou, F. Abreu Araujo, J. Torrejon +11
Fabricating powerful neuromorphic chips the size of a thumb requires miniaturizing their basic units: synapses and neurons. The challenge for neurons is to scale them down to submi…
Spin Accumulation in Nondegenerate and Heavily Doped p-Type Germanium
S. Iba, H. Saito, A. Spiesser +4
Spin accumulation induced in p-type germanium from Fe/MgO tunnel contacts is studied as a function of hole concentration p (10^16 - 10^19 cm-3). For all p, the contacts are free of…
Microwave neural processing and broadcasting with spintronic nano-oscillators
P. Talatchian, M. Romera, S. Tsunegi +14
Can we build small neuromorphic chips capable of training deep networks with billions of parameters? This challenge requires hardware neurons and synapses with nanometric dimension…
Self-injection locking of a vortex spin torque oscillator by delayed feedback
S. Tsunegi, E. Grimaldi, R. Lebrun +8
The self-synchronization of spin torque oscillators is investigated experimentally by re-injecting its radiofrequency (rf) current after a certain delay time. We demonstrate that t…
A method for reduction of propagation loss of surface plasmons. Experimental demonstration of the loss reduction for Fe/MgO/AlGaAs plasmonic structure integrated with AlGaAs/GaAs optical waveguide
V. Zayets, H. Saito, K. Ando +1
A method for the substantial reduction of propagation loss of surface plasmons was proposed and experimentally demonstrated. The method is based on the fact that the propagation lo…
Rectification of radio frequency current in ferromagnetic nanowire
A. Yamaguchi, H. Miyajima, T. Ono +4
We report the rectification of a constant wave radio frequency (RF) current by using a single-layer magnetic nanowire; a direct-current voltage is resonantly generated when the RF…
Driven energy transfer between coupled modes in spin-torque oscillators
R. Lebrun, J. Grollier, P. Bortolotti +11
The mutual interaction between the different eigenmodes of a spin-torque oscillator can lead to a large variety of physical mechanisms from mode hopping to multi-mode generation, t…
Temperature dependence of microwave voltage emission associated to spin-transfer induced vortex oscillation in magnetic tunnel junction
P. Bortolotti, A. Dussaux, J. Grollier +7
The temperature dependence of a vortex-based nano-oscillator induced by spin transfer torque (STVO) in magnetic tunnel junctions (MTJ) is considered. We obtain emitted signals with…
Integer, fractional and side band injection locking of spintronic feedback nano-oscillator to microwave signal
Hanuman Singh, K. Konishi, S. Bhuktare +8
In this article we demonstrate the injection locking of recently demonstrated spintronic feedback nano oscillator to microwave magnetic fields at integers as well fractional multip…
Large spin accumulation voltages in epitaxial Mn5Ge3 contacts on Ge without oxide tunnel barrier
A. Spiesser, H. Saito, R. Jansen +2
Spin injection in high-quality epitaxial Mn5Ge3 Schottky contacts on n-type Ge has been investigated using a three-terminal Hanle effect measurement. Clear Hanle and inverted Hanle…
Thermal spin current and magnetothermopower by Seebeck spin tunneling
R. Jansen, A. M. Deac, H. Saito +1
The recently observed Seebeck spin tunneling, the thermoelectric analog of spin-polarized tunneling, is described. The fundamental origin is the spin dependence of the Seebeck coef…
Magnetic fingerprint in a ferromagnetic wire: Spin torque diode effect and induction of the DC voltage spectrum inherent in the wire under application for RF current
A. Yamaguchi, T. Ono, Y. Suzuki +2
We report the rectifying effect of a constant-wave radio frequency (RF) current by a magnetic domain wall (DW) on a single-layered ferromagnetic wire. A direct-current (DC) voltage…
Controlling the phase locking of unstable magnetic bits for ultra-low power computation
A. Mizrahi, N. Locatelli, R. Lebrun +6
When fabricating magnetic memories, one of the main challenges is to maintain the bit stability while downscaling. Indeed, for magnetic volumes of a few thousand nm3, the energy ba…