Through the anomalous Hall effect (AHE), a ferromagnet can generate spin current in direction transverse to an applied charge current, and hence exert torque on another ferromagnet. The authors observe, however, that when in-plane is passed through spin-valve structure, out-of-plane effective magnetic field created, which exerts free layer. This field, originating from broken mirror symmetry of valve, completely dominates dampinglike one expects AHE. Such strong would be useful for switching...

Generation of spin current lies at the heart spintronic research. The Hall effect and Seebeck have drawn considerable attention in last few years to create pure by heavy metals ferromagnets, respectively. In this work, we show direct evidence heat conversion non-magnetic Platinum Nernst (SNE) room temperature. This is thermal analogue non-magnets. We shown that 8 K/μm gradient Pt can lead generation density order 108 A/m2 virtue SNE. opens up an additional possibility couple relativistic...

Electronic spins provide an additional degree of freedom that can be used in modern spin-based electronic devices. Some benefits spintronic devices include nonvolatility, energy efficiency, high endurance, and CMOS compatibility, which leveraged for data processing storage applications today's digital era. To implement such functionalities, controlling manipulating electron is prime interest. One the efficient ways achieving this spintronics to use electric field control spin or magnetism...

In this work report unconventional sign change of field like spin orbit torque in ultra-thin Chromium(1.5nm-5nm)/Nickel(8nm) bi-layer. We performed standard spin-torque ferromagnetic resonance (ST-FMR) experiment Cr/Ni bi-layer by passing radio frequency current and measuring DC voltage. observe that when thickness Cr layer is critically low (<6nm) on Ni significantly increases. Most importantly the opposite to Oersted generated torque. To verify interracial nature torque, 2 nm thin Cu...

Spin Hall nano oscillators have been of great interest due to their simple realization and potential applications. The requirement the external field is a major obstacle for on-chip applications spin oscillators. In this work, we propose field-free oscillator based upon exchange bias in ferro/anti-ferromagnetic (FM/AFM) structures. Owing spin-orbit coupling interactions, AFM can provide as well currents required driving FM magnetization into spontaneous oscillations. We performed macrospin...

Enhancing the performance of magnetic random access memories (MRAMs) is crucial, considering speed, energy efficiency, and endurance. Spin-orbit torque-based MRAMs offer ultrafast operation enhanced reliability. Still, efficiency external field requirement for deterministic switching nanomagnets with perpendicular anisotropy (PMA) are a significant hurdle. To address these issues, one proposed solutions employs conically magnetized free layer tunnel junction device featuring second-order...

Spintronic oscillators being highly nonlinear have gained immense attention to mimic the neuron spiking behavior in neural networks used for building neuromorphic computing hardware. However, need an external magnetic field realize spintronic imposes significant limitations on their scalability, tunability, and fabrication complexity. So, this study, we realized a bias-field-free spin Hall nano-oscillator (SHNO) using heavy metal/magnetic tunnel junction (MTJ) heterostructure. The field-free...

We report the thermally driven giant field-like spin-torque in magnetic tunnel junctions (MTJ) on application of heat current from top to bottom. The term is detected by shift magneto-resistance hysteresis loop applying temperature gradient. observed that depends symmetry MTJ. In asymmetric structures, with different ferromagnetic materials for free and fixed layers, greatly enhanced. Our results show a pure spin density order 109 A/m2 can be produced creating 120 mK difference across 0.9 nm...

A gyrator is a non-reciprocal two port device with 180° phase shift in the transmissions between ports. Though electromagnetic realizations of gyrators have been well studied, devices based on other forms interaction are relatively unexplored. Here we demonstrate which signal transmitted via magneto-elastic coupling, can function as gyrator. The built piezoelectric substrate: one this has interdigital transducers (IDTs) and periodic array nickel/gold lines. When magnetizations Ni lines...

As spintronics continues to replace conventional electronics, devices that produce oscillatory signals are needed in particular. They usually based on spin-transfer torque, but this study offers an alternative, feedback of spin current into a magnetic tunnel junction (MTJ). A combination thermal fluctuations, magnetoresistance, and the Hall effect can induce periodic precessional states MTJ's free layer, significantly reducing critical for oscillations improving their quality factor.

The magnetization of a nano-magnet can be manipulated and even switched by spin-orbit torques. Hence, accurate characterization these torques is essential from the application perspective. In this work, we present an alternative method to characterize torque utilizing planar Hall effect ferromagnet. We show that while ferromagnet excited resonance due torque, its resistance also varies, which leads sensitive detection torque. further demonstrate geometry enables us estimate spin angle...

Reliability and packing density concerns are the two major shortcomings of spin transfer torque orbit based magnetic memory, respectively. Voltage controlled anisotropy (VCMA) becomes energy efficient fast, showing transcendence for writing mechanism in tunnel junction. Deterministic switching cannot be achieved by VCMA alone out plane nanomagnet. It requires an external in-plane field, but use field is inconvenient on-chip applications. We exploit stress exchange bias provided...

The phenomenon of injection locking, in which coupled oscillators become synchronized, is exciting from the points view both physics and technology, with relevance to many systems physics, chemistry, biology. This study explores locking a nanoscale spintronic oscillator feedback. Beyond integer fractional this also test bed for...

Low output power and limited spectral purity are two major challenges in developing spin-transfer nano-oscillators (STNOs) for applications spintronics. The authors demonstrate that a combination of delayed magnetic field feedback injection locking can be used to overcome both challenges, significantly improved signal quality. Furthermore, with increasing strength phase is found which oscillations stabilized by the itself, showing network strongly coupled STNOs feasible. By controlling...

More and more attention is turned to using particular physical systems for innovative computational schemes. For example, an array of synchronized oscillators can be used solve unconventional, computationally hard problems. Here the authors demonstrate synchronization spin-transfer-torque nano-oscillators via long-range Oersted magnetic field coupling. This coupling scheme presents advantage engineering asymmetric between any two oscillators, which would mimic different biological neural...

Spin current has emerged as a leading candidate for manipulation of spins in nano-magnet. We here experimentally show another utility spin current, viz., it can be used the generation phonons. Within same experimental setup, we also demonstrate inverse effect by To these effects, measured scattering-matrix two-port device with interdigital transducers one port and an array Ni/Pt lines second made on piezoelectric substrate. The off-diagonal elements which correspond to transmission between...

Deterministic spin orbit torque (SOT) magnetization switching of the perpendicular magnetic anisotropy structures requires an external field, which is unsuitable for on-chip applications. Various approaches are there to debar field requirement. In this work, we use static stress, can generate a virtual via magnetoelastic coupling. We show that be used deterministic switching. our simulations, antiferromagnetic material generating SOT and exchange bias avail benefits like (FLT). With...

Relativistic interaction between an electron's spin and orbital angular momentum has provided efficient mechanism to control the magnetization of nanomagnets. Extensive research been done understand improve spin-orbit-interaction-driven torques generated by nonmagnets applying electric current. In this work, we show that heat current in a nonmagnet can also couple its spin-orbit produce torque on adjacent ferromagnet. Hence, work provides platform study spin-orbito-caloritronic effects heavy...

In this work we have studied the effect of external applied magnetic field on locking range spintronic feedback nano oscillator. Injection oscillator at integer and fractional multiple its auto oscillation frequency was demonstrated recently. Here show that increases with increasing field. We also synchronization (n=1,2,3) multiples side band peaks higher values. verified experimental results macro-spin simulation using similar conditions as used for study.

Non-linear dynamics, including auto-oscillations, chaotic and synchronization, are integral to physical biological applications can be excited in spintronic devices. In this study, we interested exploring the excitation of chaos using voltage feedback a spin torque nano oscillator Magnetic Tunnel Junction (MTJ). According Poincar\'e-Bendixson theorem, cannot arise two-dimensional system MTJ featuring two dynamic variables describing zenith azimuth angles magnetization. Hence, prefer as it...