Joint Effect of a Magnetic Field and a Spin-Polarized Current on the Coupled Dynamics of Magnetic Vortices in a Spin-Transfer Nano-Oscillator

The joint effect of the spin polarized current and an external magnetic field on the dynamics of magnetization in vortex spin-transfer nano-oscillators with a diameter of 400 nm is investigated. For the numerical calculation of the coupled dynamics of magnetic vortices, the SpinPM software package for micromagnetic modeling was used. The dependence of the frequency of stationary coupled oscillations of vortices on the magnitude of the magnetic field, which determines the operating frequency range of a tunable vortex spin-transfer nano-oscillator.

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Исследование связанной динамики магнитных вихрей в трехслойном проводящем наноцилиндре

Физика твердого тела ◽

10.21883/ftt.2018.06.45974.22m ◽

2018 ◽

Vol 60 (6) ◽

pp. 1045

Author(s):

С.В. Степанов ◽

А.Е. Екомасов ◽

К.А. Звездин ◽

Е.Г. Екомасов

Keyword(s):

Magnetic Field ◽

External Magnetic Field ◽

Vortex Motion ◽

Numerical Data ◽

Sample Plane ◽

Current Dependence ◽

Magnetic Vortices ◽

Lifshitz Equation ◽

Spin Polarized ◽

Stationary Vortex

AbstractSolving numerically the generalized Landau–Lifshitz equation, we have carried out the micromagnetic investigation of the dynamics of two dipole-coupled magnetic vortices in a trilayer nanocolumn under the action of the external magnetic field directed perpendicular to the sample plane and spin-polarized electric field. The possible existence of different regimes of vortex motion, depending on the polarized current, is demonstrated. The current dependence of the oscillation frequency for the case of stationary dynamics of coupled vortices with the same frequency has been established. The possibility of controlling the frequency of the stationary vortex motion and tuning the control current amplitude by the external magnetic field is shown. Using the analytical method for simplified description of the dynamics of coupled vortices, the current and magnetic-field dependences of the frequency have been obtained, which are qualitatively consistent with the numerical data.

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Evaluating the nonadiabatic spin-transfer torque using coupled oscillation of magnetic vortices

Physical Review B ◽

10.1103/physrevb.98.064421 ◽

2018 ◽

Vol 98 (6) ◽

Author(s):

Taisuke Horaguchi ◽

Tomoki Tanazawa ◽

Yukio Nozaki

Keyword(s):

Spin Transfer Torque ◽

Spin Transfer ◽

Magnetic Vortices

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Magnetic-field-application system at high temperatures for spin-polarized scanning-electron-microscopy measurement

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2021.168482 ◽

2021 ◽

pp. 168482

Author(s):

Teruo Kohashi ◽

Hideo Matsuyama

Keyword(s):

Magnetic Field ◽

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Field Application ◽

Application System ◽

Scanning Electron Microscopy Measurement ◽

Spin Polarized ◽

Microscopy Measurement ◽

Scanning Electron ◽

Magnetic Field Application

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Chiral Magneto-Electrochemistry

Magnetochemistry ◽

10.3390/magnetochemistry4030036 ◽

2018 ◽

Vol 4 (3) ◽

pp. 36 ◽

Cited By ~ 5

Author(s):

Anup Kumar ◽

Prakash Mondal ◽

Claudio Fontanesi

Keyword(s):

Magnetic Field ◽

Experimental Studies ◽

Spin Accumulation ◽

Chiral Molecules ◽

Electrochemical System ◽

Ferromagnetic Electrodes ◽

Spin Polarized ◽

The Magnetic Field ◽

Research Domain

Magneto-electrochemistry (MEC) is a unique paradigm in science, where electrochemical experiments are carried out as a function of an applied magnetic field, creating a new horizon of potential scientific interest and technological applications. Over time, detailed understanding of this research domain was developed to identify and rationalize the possible effects exerted by a magnetic field on the various microscopic processes occurring in an electrochemical system. Notably, until a few years ago, the role of spin was not taken into account in the field of magneto-electrochemistry. Remarkably, recent experimental studies reveal that electron transmission through chiral molecules is spin selective and this effect has been referred to as the chiral-induced spin selectivity (CISS) effect. Spin-dependent electrochemistry originates from the implementation of the CISS effect in electrochemistry, where the magnetic field is used to obtain spin-polarized currents (using ferromagnetic electrodes) or, conversely, a magnetic field is obtained as the result of spin accumulation.

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