Oxide magnonics: Spin waves in functional magnetic oxides

Abstract

Spin waves or their quanta magnons are collective excitations in magnetically ordered materials. Magnonics have recently attracted tremendous interest for building next-generation nanoscale devices and circuits with low-power consumption. Oxide materials provide an excellent platform for achieving highly efficient spin-wave excitation and transmission for magnonic applications with versatile functionalities. In this article, we review some recent advances for oxide-based magnonics, including both magnetic oxides for hosting spin waves and non-magnetic oxides for manipulating spin waves. First, we introduce recent development on coherent propagation and incoherent transport of magnons in thin-film iron garnets, low-damping ferrimagnetic oxides widely used in magnonics. Then, we discuss spin-wave chirality due to the inversion symmetry broken in magnetic oxides. Magnonics in antiferromagnetic oxides is also presented, where the spin-wave resonance frequency enters THz regime. Nanoscale spin textures, such as magnetic skyrmions, can be stabilized in magnetic oxides, and provide additional versatilities by coupling their dynamics with spin waves. Last but not the least, we highlight the electrical control of spin waves based on multiferroic oxides toward applications for hybrid magnonics.

Excitation of exchange spin waves in a magnetic insulator thin film at cryogenic temperatures

“…Spin waves are collective excitation of electron spins, which provide promising prospects for the next generation of lowpower-consumption electronic devices and circuits [1][2][3][4][5][6][7]. Propagating without the motion of electrons, spin waves can enable information processing and computing with negligible heat dissipations.…”

Nonlinear three-magnon scattering in low-damping La0.67Sr0.33MnO3 thin films

“…[24] The oxide ferromagnetic material La 0.67 Sr 0.33 MnO 3 (LSMO) has also attracted a lot of attention and demonstrates the multiple functionalities for potential application in spintronics [25][26][27] and magnonics. [28][29][30] The current-controlled propagation of spin waves is demonstrated in stripe domains of LSMO/LaAlO 3 films. [31] and the magnon-polarons with long decay length (≥ 1 mm) in BiFeO 3 /LSMO heterostructures are realized by magnonphonon coupling.…”