Electric Field Control of Magnon Power Flow in Thin Ferromagnet Films

Abstract

External electric field can modify the strength of the spin-orbit interaction between spins of ions in magnetic crystals. This influence leads to a spin wave frequency shift that is linear in both the applied electric field and the wave vector of the spin wave. Here, we explore theoretically the external electric field as a means of control of the spin wave power flow in ultrathin ferromagnets. The spin wave group velocity and focusing pattern is obtained from the slowness (isofrequency) curves by evaluating their curvature at each point of the reciprocal space. We show that the combination of the magneto-dipole interaction and the electric field can result in non-reciprocal unidirectional caustic beams of dipole-exchange spin waves. Our findings open a novel avenue for spin wave manipulation and development of electrically tuneable magnonic devices.

Magnetic stability for the Hartree-Fock ground state in two dimensional Rashba-Gauge electronic systems

“…Stronger exchange coupling J depletes the average magnetization on Z direction. Eye guide dots are shown as reference for the results obtained in Figures (2) and (5). Increasing field effects over the local minimum of F are represented by the continuous lines (a)-(f).…”

“…The control of magnetization states on nanoscaled multiferroic devices via externally applied electric field constitutes a technological challenge with multiple and interesting applications [1][2][3][4][5][6][7][8][9][10]. The general consensus for the cross-coupling mechanism of electric/magnetic polarization due to magnetic/electric sources relies on the very first sight upon several phenomena: i) the elastic strain on surfaces or interfaces, ii) the exchange-type Dzyaloshinskii-Moriya interaction and iii) the chargedriven magnetoelectric effects due to charge density accumulation [11,12].…”

Steady state entanglement of distant nitrogen-vacancy centers in a coherent thermal magnon bath

“…e stands for the electron charge. E SO ∼ 19 eV ∼ 3.044 aJ is an energy scale related to the inverse of the Dzyaloshinskii-Moriya (DM) interaction coefficient, reflecting the microscopic spin-orbit coupling effect [31,[45][46][47][48][49]. We assume electric field is transverse to the YIG strip axis (x) and NV centers are shielded from its influence.…”

“…Very recently, thermal control of brodband magnons in YIG crystals has been proposed [44]. Further control on the magnon dispersion relation is introduced by an electric field transverse to the YIG axis [23,31,[44][45][46][47][48][49].…”

Spin- and Angle-Resolved Spectroscopy and Spin Waves in Biogenic Magnonic Systems

“…Krivoruchko and Savchenko, 2018 explored the use of electric field to control the power flow of spin waves in thin ferromagnetic films by strengthening spinorbit in ions present in the material, causing a frequency shift of spin which is evaluated using an isofrequency curve. This result could help in creating magnonic devices which can be tuned electrically [11].…”