title: Spin-Hall nano-oscillator with oblique magnetization and Dzyaloshinskii-Moriya interaction as generator of skyrmions and nonreciprocal spin-waves.
abstract: Spin-Hall oscillators (SHO) are promising sources of spin-wave signals for magnonics applications, and can serve as building blocks for magnonic logic in ultralow power computation devices. Thin magnetic layers used as "free" layers in SHO are in contact with heavy metals having large spin-orbital interaction, and, therefore, could be subject to the spin-Hall effect (SHE) and the interfacial Dzyaloshinskii-Moriya interaction (i-DMI), which may lead to the nonreciprocity of the excited spin waves and other unusual effects. Here, we analytically and micromagnetically study magnetization dynamics excited in an SHO with oblique magnetization when the SHE and i-DMI act simultaneously. Our key results are: (i) excitation of nonreciprocal spin-waves propagating perpendicularly to the in-plane projection of the static magnetization; (ii) skyrmions generation by pure spin-current; (iii) excitation of a new spin-wave mode with a spiral spatial profile originating from a gyrotropic rotation of a dynamical skyrmion. These results demonstrate that SHOs can be used as generators of magnetic skyrmions and different types of propagating spin-waves for magnetic data storage and signal processing applications.
authors: Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, Messina, Italy.
authors: A
authors: A
authors: Giordano
authors: Institute of Magnetism, National Academy of Sciences of Ukraine, Kyiv, Ukraine.
authors: R
authors: R
authors: Verba
authors: Department of Physics and Earth Sciences and CNISM Unit of Ferrara, University of Ferrara, Ferrara, Italy.
authors: R
authors: R
authors: Zivieri
authors: Department of Engineering, University of Roma Tre, Roma, Italy.
authors: A
authors: A
authors: Laudani
authors: Department of Engineering, University of Messina, Messina, Italy.
authors: V
authors: V
authors: Puliafito
authors: Istituto Officina dei Materiali del CNR (CNR-IOM), Sede Secondaria di Perugia, c/o Dipartimento di Fisica e Geologia, University of Perugia, Perugia, Italy.
authors: G
authors: G
authors: Gubbiotti
authors: Department of Engineering, Polo Scientifico Didattico di Terni, University of Perugia, Terni, Italy.
authors: R
authors: R
authors: Tomasello
authors: Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, Messina, Italy.
authors: G
authors: G
authors: Siracusano
authors: Department of Engineering, University of Messina, Messina, Italy.
authors: B
authors: B
authors: Azzerboni
authors: Department of Electrical and Information Engineering, Politecnico di Bari, I-70125 Bari, Italy.
authors: M
authors: M
authors: Carpentieri
authors: Department of Physics, Oakland University, Rochester, MI 48309, USA.
authors: A
authors: A
authors: Slavin
authors: Department of Mathematical and Computer Sciences, Physical Sciences and Earth Sciences, University of Messina, Messina, Italy.
authors: G
authors: G
authors: Finocchio