Electrical field enhanced interfacial Dzyaloshinskii-Moriya interaction in MgO/Fe/Pt system

Abstract

We report electric field control of the interfacial Dzyaloshinskii-Moriya interaction (DMI) in MgO/Fe/Pt multilayers. The interfacial DMI is obtained and quantified by Brillouin light scattering measurements based on the frequency nonreciprocity of spin waves in a ferromagnet. The magnitude of the induced DMI is found to linearly increase as a function of electric field intensity. The efficiency of electric field control of the interfacial DMI characterized as a ratio of the DMI energy change to the electric field, which is found to be equal to 67 fJ/(Vm) with a positive electric field. We further demonstrate that the origin of the enhanced DMI results from the MgO/Fe interface. The Rashba spin-orbit coupling and electric field induced anisotropy at the MgO/Fe interface might be responsible for the enhanced interfacial DMI. Our findings open up a way for exploring the spintronic devices with a tunable DMI.

Electric-field control of skyrmions in multiferroic heterostructure via magnetoelectric coupling

“…Interfacial DMI is essential for stabilizing skyrmions in Pt/Co/Ta (see ref. 8 ), and we used Brillouin light spectroscopy (BLS) 21 , 22 to measure it under different electric fields. By measuring the wave-vector dependence of the frequency difference Δ f between the anti-Stokes and Stokes peaks, the interfacial DMI strength of the Pt/Co/Ta multilayer ( D ) can be determined by the following equation: where k is the in-plane wave vector, γ is the gyromagnetic ratio, and M S is the saturation magnetization.…”

“…The similarities in the volatility and asymmetry between interfacial DMI and strain behaviors indicate a strain-mediated electric-field control of interfacial DMI. Some reports showed importance of charge accumulation/depletion 22 or ion migration 21 in controlling Rashba-type interfacial DMI (see ref. 38 ) with a sizable modulation via electric-field gating on the dielectric/FM interface 21 , 22 .…”

Long-range spin chirality dimer order in the Heisenberg chain with modulated Dzyaloshinskii-Moriya interactions

“…[6] where the XY spin chain with random changes in the sign of DM interactions was studied. However, recently it has been demonstrated that DM interaction can be efficiently tailored with an substantial efficiency factor by structural modulations [24] or by external electric field [25][26][27]. This unveils the possibility not only to control DM interaction and magnetic anisotropy via the electric field or other controllable ways, but also opens a possibility to consider effect of more general spatially modulated DM interaction on properties of the spin chain.…”

Meronlike Spin Textures in In-Plane-Magnetized Thin Films

“…Skyrmions are nontrivial magnetic spin textures considered to offer better functionalities for spintronic and storage devices owing to their topological nature, which provides stability from defects and from external perturbations [8][9][10][11][12]. For example, it has been shown that skyrmions and skyrmionic structures can be displaced using relatively small current densities [12], stabilized under an applied magnetic field [13] and, when interfaced with a gate dielectric, controlled by an applied electric field [14][15][16][17]. More generally, the topological nature of a spin texture is characterized by the topological charge or skyrmion winding number [18][19][20][21].…”