Nanoscale physics

Electric field-controlled magnetization excitations in nanoheterostructures 
Korostil A.A1., Krupa M.M.1, Kalanda N.A.2, Yarmolovich M.V.2
1Department of Physics of Meso- and Nanocrystalline Magnetic Structures, Institute of Magnetism NAS and MES  of Ukraine.  Vernadsky av., 36b, Kyiv, Ukraine. E-mail: amand@rambler.ru
2Department of cryogenic researches, Scientific-Practical Materials Centre,  NAS of Belarus, Brovky str., 19, Minsk, Belarus

Electric field-controlled magnetization excitations in nanoheterostructures can be realized both via the spin torque effect of transfer of the spin moment from the spin current to magnetic moments and by direct localized impact on the surface  magnetic anisotropy [1]. Those effects involve both spatially localized and nonlocalized magnetization dynamics manifesting as localized magnetic precession, switching and spin wave. respectively [2]. They can be basis for the application in spintronics devices, magnetic recording and exact transfer of information via spin wave. It is shown, that voltage controlled magnetic anisotropy promises  to excite uniform ferromagnetic resonance in ultrathin 3d-ferromagnets with ultralow power consumption [3]. 
The electric field-controlled change of  the magnetic anisotropy related to  the field-induced spin redistribution near the magnetic surface at the spin-orbit interaction causing change of the surface magnetic anisotropy. This can be described as the result of combined action of the effective bias field of the Rashba spin-orbit interaction and the exchange s-d interaction between polarized conduction electrons and anisotropy magnetization [3]. On the basis of the corresponding band Stoner model with the Rashba interaction and the spin Hall effect it is considered the field-controlled magnetization switching and spin wave propagation in magnetic nanoheterostructures based on 3d-metallooxides. 

1.	Zhou Y., Jiao H., Chen Y., Bauer G.E.W., Xiao J. Current-induced spin-wave excitation in Pt/YIG bilayer // Phys. Rev.-2013.- B 88.-P.18440.
2.	Rana B., Fukoma Y., Miura K., Takanashi H., Otani Y  Excitation of coherent propagating spin waves in ultrathin CoFeB film by voltage controlled magnetic anisotropy // Appl. Phys. Lett.-2017.-111.-P.052404. 
3.	Barnes S.E., Ieda J., Maekava S. Rashba Spin-Orbit Anisotropy and the Electric Field Control of Magnetism // Scientific Reports.-2014.-15.-P.1.