Abstract
Nowadays, spintronics considers magnetic domain walls as a kind of nanodeviсe that demands for switching much less energy in comparison to homogeneous process. We propose and demonstrate a new concept for the light control via electric field applied locally to a magnetic domain wall playing the role of nanodevice. In detail, we charged a 15-μm-thick metallic tip to generate strong non-uniform electric field in the vicinity of the domain wall in the iron garnet film. The electric field influences the domain wall due to flexomagnetoelectric effect and causes the domain wall shift. The resulting displacement of the domain wall is up to 1/3 of domain width and allows to demonstrate a novel type of the electrically controlled magneto-optical shutter. Polarized laser beam focused on the electric-field-driven domain wall was used to demonstrate the concept of a microscale Faraday modulator. We obtained different regimes of the light modulation – linear, nonlinear and tri-stable – for the same domain wall with corresponding controllable displacement features. Such variability to control of domain wall’s displacement with spatial scale of about 10 μm makes the proposed concept very promising for nanophotonics and spintronics.
Highlights
Nowadays, local manipulation of the magnetization is of prime research interest in spintronics, quantum information and nanophotonics
The electric field modulation of the magneto-optical Faraday rotation is called electro-magnetooptical effect. It was first observed in the yttrium iron garnet (YIG) samples sandwiched between two transparent plane electrodes[19]
In our recent experiments we showed that application of electric field by the electrically charged tip provides displacement of the magnetic domain wall (DW)
Summary
Local manipulation of the magnetization is of prime research interest in spintronics, quantum information and nanophotonics. Local manipulation of the magnetic moments is strongly required in spin electronics as well[3] In this view utilizing a domain wall (DW) may be the solution for various challenges in spintronics since the DWs may be considered as nanometer-scaled elements of magnonic nanocircuitry: channels for the control of spin-wave propagation[4], deflectors[5] (even with negative refraction6), tunable sources of short-wavelength spin waves[7] and many others. The electric field modulation of the magneto-optical Faraday rotation is called electro-magnetooptical effect It was first observed in the yttrium iron garnet (YIG) samples sandwiched between two transparent plane electrodes[19]. 20) we showed that application of electric field by the electrically charged tip (forming the gate) provides displacement of the magnetic DW. First indirect observation of this local ferroelectricity was done as DW motion in electric field of charged tip[23] and has recently been detected directly by single molecule spectroscopy technique[24]
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