Mondal, Sucheta ; Abeed, Md Ahsanul ; Dutta, Koustuv ; De, Anulekha ; Sahoo, Sourav ; Barman, Anjan ; Bandyopadhyay, Supriyo (2018) Hybrid Magnetodynamical Modes in a Single Magnetostrictive Nanomagnet on a Piezoelectric Substrate Arising from Magnetoelastic Modulation of Precessional Dynamics ACS Applied Materials & Interfaces, 10 (50). pp. 43970-43977. ISSN 1944-8244
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Official URL: http://doi.org/10.1021/acsami.8b19243
Related URL: http://dx.doi.org/10.1021/acsami.8b19243
Abstract
Magnetoelastic (or “straintronic”) switching has emerged as an extremely energy-efficient mechanism for switching the magnetization of magnetostrictive nanomagnets in magnetic memory and logic, and non-Boolean circuits. Here, we investigate the ultrafast magnetodynamics associated with straintronic switching in a single quasielliptical magnetostrictive Co nanomagnet deposited on a piezoelectric Pb(Mg1/3Nb2/3)O3–PbTiO3 substrate using time-resolved magneto-optical Kerr effect (TR-MOKE) measurements. The pulsed laser pump beam in the TR-MOKE plays a dual role: it causes precession of the nanomagnet’s magnetization about an applied bias magnetic field and it also generates surface acoustic waves in the piezoelectric substrate that produce periodic strains in the magnetostrictive nanomagnet and modulate the precessional dynamics. This modulation gives rise to intriguing hybrid magnetodynamical modes in the nanomagnet, with a rich spin-wave texture. The characteristic frequencies of these modes are 5–15 GHz, indicating that strain can affect magnetization in a magnetostrictive nanomagnet in time scales much smaller than 1 ns (∼100 ps). This can enable ∼10 GHz range magnetoelastic nano-oscillators that are actuated by strain instead of a spin-polarized current, as well as ultrafast magnetoelectric generation of spin waves for magnonic logic circuits, holograms, etc.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Chemical Society. |
Keywords: | Precessional Magnetodynamics; Magnetoelastic Coupling; Straintronics; Magnetic Nanostructures; Time-resolved Magneto-optical Kerr Effect; Spin-wave Modes. |
ID Code: | 116191 |
Deposited On: | 07 Apr 2021 10:25 |
Last Modified: | 07 Apr 2021 10:25 |
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