Excitation of spin waves by a current-driven magnetic nanocontact in a perpendicularly magnetized waveguide

Article

关键词: POLARIZED CURRENT;    ELECTRIC-CURRENT;    TORQUE;    MULTILAYER;    EMISSION;   

DOI  :  10.1103/PhysRevB.88.014417

来源: SCIE

【 摘 要 】

It is demonstrated both analytically and numerically that the properties of spin wave modes excited by a current-driven nanocontact of length L in a quasi-one-dimensional magnetic waveguide magnetized by a perpendicular bias magnetic field H-e are qualitatively different from the properties of spin waves excited by a similar nanocontact in a two-dimensional unrestricted magnetic film (free layer). In particular, there is an optimum nanocontact length L-opt corresponding to the minimum critical current of the spin wave excitation. This optimum length is determined by the magnitude of H-e, the exchange length, and the Gilbert dissipation constant of the waveguide material. Also, for L < L-opt the wavelength lambda (and the wave number k) of the excited spin wave can be controlled by the variation of H-e (lambda decreases with the increase of H-e), while for L > L-opt the wave number k is fully determined by the contact length L (k similar to 1/L), similar to the case of an unrestricted two-dimensional free layer.

【 授权许可】

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