Influence of sloped electric field on magnetic-field-induced domain wall creep in a perpendicularly magnetized Co wire

Abstract

A creep motion of the magnetic domain wall (DW) in a perpendicularly magnetized Co wire, where the DW energy is artificially varied by applying a sloped electric field, is studied. Under the sloped electric field and a constant external magnetic field, the DW velocity gradually changes according to the position of the wire owing to the spatially varying DW energy. Although the sloped DW energy can be a source to drive a DW, no clear electric-field-induced DW motion is observed, most likely because the effective magnetic field induced by the sloped electric field is very small in the present system.

Magnonic Metamaterials for Spin-Wave Control with Inhomogeneous Dzyaloshinskii–Moriya Interactions

“…Up to now, it has been shown that the graded magnonic refractive index can be created by modification of the material properties, such as non-uniform saturation magnetization or exchange constant [ 44 , 45 , 46 , 47 ], the magnetic anisotropy [ 19 , 20 ] or the internal magnetic field [ 37 , 48 ]. This index can be also achieved by utilizing a non-uniform external magnetic field [ 39 , 49 , 50 , 51 ], electric field (voltage) [ 52 , 53 ] or temperature [ 54 , 55 ]. Therefore, graded-index magnonics are expected to overcome the current limitation of magnonics and pave feasible routes for the implementation of spin-wave devices.…”

Spin-wave beam propagation in ferromagnetic thin films with graded refractive index: Mirage effect and prospective applications

“…Very good example of such non-uniformity is the demagnetizing field naturally existing at the edges of ferromagnetic films [12][13][14] or a noncollinear magnetization [15][16][17]. The gradual change of the refractive index can be also introduced during device fabrication by nanostructuralization, ion implantation, or voltage [18]. Furthermore, it is possible to modulate refractive index dynamically by a change of the external magnetic field, e.g., using a magnetic field generated by DC current [19][20][21][22], the voltage across the film [18], or temperature [23,24].…”

Electric field control on gated Pt/Co/SiO2 heterostructure with insulating polymer

“…Electric field control of spintronic devices in ferro-metallic materials has garnered a lot of attention from researchers as it opens up the possibility of developing novel magnetic recording devices with low power consumption [1][2][3][4]. A spintronics device with a high coercivity (H c ) is excellent for data retention, whereas a low H c is preferred for data writing by means of magnetization switching.…”

“…This is seen in magnetic tunnel junctions, where the H c of a magnetic free layer can be reduced by electric field control before magnetization switching is achieved with lower energy [6][7][8]. In domain wall (DW) based devices, this can be further utilized in DW propagation [2,9,10]. Recently, it has been demonstrated that DWs propagated by spin-orbit torque (SOT) can achieve high DW propagation speeds [11][12][13].…”

“…The physics underpinning the mechanism of SOT [14,15] is well studied. Hence, an application of electric field can potentially work in tandem with existing DW propagation methods to achieve highs speed DWs with low power consumption [2,9,16].…”