Dynamic converse magnetoelectric effect in ferromagnetic nanostructures with electric-field-dependent interfacial anisotropy

Viaud, G; Pertsev, N. A.

doi:10.1103/physrevb.90.064429

Cited by 9 publications

(5 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our simulations, the numerical integration of the LLG equation is carried out using the projective Runge-Kutta algorithm with the time step of 10 fs, which is much smaller than the duration τ V > 0.1 ns of the rectangular voltage pulses applied to the gate electrode. To make possible a nonparametric excitation of the magnetic dynamics by VCMA, we introduce an IP magnetic field H||[110] creating an oblique orientation of the equilibrium magnetization [17].…”

Section: A Micromagnetic Modelingmentioning

confidence: 99%

“…This opportunity appears in ferromagnet-dielectric heterostructures having strong interfacial PMA, which can be reduced significantly by an electric field created in the dielectric nanolayer. Such a voltage-controlled magnetic anisotropy (VCMA) represents an efficient tool for the excitation of magnetic dynamics in ferromagnetic nanolayers, including the precessional magnetization switching [12,13], spin reorientation transition (SRT) [14], coherent magnetization precession [15][16][17], and spin waves [18][19][20]. Performing micromagnetic simulations for a perpendicularly magnetized MgO/Fe/MgO trilayer subjected to a weak in-plane magnetic field, we reveal the formation of a droplet soliton induced by a sub-nanosecond voltage pulse locally applied to the MgO nanolayer via a gate electrode.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Generation and routing of nanoscale droplet solitons without compensation of magnetic damping

Nikitchenko

Pertsev

2022

Phys. Rev. Materials

View full text Add to dashboard Cite

Section: A Micromagnetic Modelingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Generation and routing of nanoscale droplet solitons without compensation of magnetic damping

Nikitchenko

Pertsev

2022

Phys. Rev. Materials

View full text Add to dashboard Cite

“…Magnetic dynamics in MTJs can be generated electrically because a spin-polarized current creates a spin-transfer torque (STT) when the magnetizations of two electrodes are noncollinear [31,32]. Furthermore, in MgO-based MTJs having voltage-controlled magnetic anisotropy (VCMA), magnetization oscillations can be induced in the free layer (FL) by microwave-frequency voltages even in the absence of significant STTs [21,23,24]. To enhance the STT acting on the FL magnetization, one can employ an MTJ with an ultrathin FL having perpendicular magnetic anisotropy [33,34] and a thick reference layer (RL) with in-plane magmicrowave Ãu or GaAs netization (Fig.…”

Section: Magnetization Dynamics Driven By Microwave Voltagementioning

confidence: 99%

“…It should be noted that, owing to the interlayer exchange coupling (IEC) between FL and RL, the FL magnetization M slightly deviates from the perpendicularto-plane orientation (polar angle θ ≈ 3 • ) even in the absence of applied voltage and external magnetic field. Therefore, the VCMA contributes to the voltage-induced destabilization of the FL magnetization along with the STT [23].…”

Section: Magnetization Dynamics Driven By Microwave Voltagementioning

confidence: 99%

“…However, the use of microwave magnetic fields has serious disadvantages for practical applications, such as associated high energy losses and issues related with the downscaling of spintronic devices. Fortunately, the magnetization precession can also be excited electrically using spin-polarized currents [17][18][19][20], electricfield-dependent magnetic anisotropy [21][22][23][24], and piezoelectrically generated elastic waves [25][26][27][28][29], which opens the possibility to develop spin injectors with greatly reduced power consumption.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nanoscale Spin Injector Driven by a Microwave Voltage

Nikitchenko

Pertsev

2020

Phys. Rev. Applied

View full text Add to dashboard Cite

We propose an electrically driven spin injector into normal metals and semiconductors, which is based on a magnetic tunnel junction (MTJ) subjected to a microwave voltage. Efficient functioning of such an injector is provided by electrically induced magnetization precession in the "free" layer of MTJ, which generates the spin pumping into a metallic or semiconducting overlayer. To validate the feasibility of the proposed device, we theoretically describe the spin and charge dynamics in the CoFeB/MgO/CoFeB/Au and CoFeB/MgO/CoFeB/GaAs tunneling heterostructures. First, the magnetization dynamics in the free CoFeB layer is quantified with the account of a spin-transfer torque generated by the spin-polarized current flowing through the MTJ and a voltagecontrolled magnetic anisotropy associated with the CoFeB|MgO interface. The calculations are performed in the macrospin approximation for an ultrathin CoFeB layer with perpendicular anisotropy and nanoscale in-plane dimensions. By numerically solving the Landau-Lifshitz-Gilbert-Slonczewski equation, we determine dependences of the precession amplitude on the frequency f and magnitude Vmax of the ac voltage applied to the MTJ. It is found that the frequency dependence changes drastically above the threshold amplitude Vmax ≈ 200 mV, exhibiting a break at the resonance frequency fres due to nonlinear effects. The results obtained for the magnetization dynamics are then used to describe the spin injection and pumping into the Au and GaAs overlayers. The total spin-current density near the interface is calculated as a function of time at different excitation frequencies and voltage amplitudes. Since the generated spin current creates additional charge current owing to the inverse spin Hall effect, we also calculate distributions of the charge-current density and electric potential in the thick Au overlayer. The calculations show that the arising transverse voltage, which can be used to probe the efficiency of spin generation electrically, becomes experimentally measurable at f = fres. Finally, we evaluate the spin accumulation in a long n + -GaAs bar coupled to the MTJ and determine its temporal variation and spatial distribution along the bar. It is found that the ac spin accumulation under resonant excitation is large enough for experimental detection via a voltage between two ferromagnetic nanocontacts even at micrometer distances from the MTJ. This result demonstrates high efficiency of the described nanoscale spin injector driven by microwave voltage.

show abstract

Crystalline structure and magnetic properties of structurally ordered cobalt–iron alloys grown on Bi-containing topological insulators and systems with giant Rashba splitting

et al. 2018

View full text Add to dashboard Cite

show abstract

Dynamic converse magnetoelectric effect in ferromagnetic nanostructures with electric-field-dependent interfacial anisotropy

Cited by 9 publications

References 27 publications

Generation and routing of nanoscale droplet solitons without compensation of magnetic damping

Generation and routing of nanoscale droplet solitons without compensation of magnetic damping

Nanoscale Spin Injector Driven by a Microwave Voltage

Crystalline structure and magnetic properties of structurally ordered cobalt–iron alloys grown on Bi-containing topological insulators and systems with giant Rashba splitting

Contact Info

Product

Resources

About