title: Photodrive of magnetic bubbles via magnetoelastic waves.
abstract: Precise control of magnetic domain walls continues to be a central topic in the field of spintronics to boost infotech, logic, and memory applications. One way is to drive the domain wall by current in metals. In insulators, the incoherent flow of phonons and magnons induced by the temperature gradient can carry the spins, i.e., spin Seebeck effect, but the spatial and time dependence is difficult to control. Here, we report that coherent phonons hybridized with spin waves, magnetoelastic waves, can drive magnetic bubble domains, or curved domain walls, in an iron garnet, which are excited by ultrafast laser pulses at a nonabsorbing photon energy. These magnetoelastic waves were imaged by time-resolved Faraday microscopy, and the resultant spin transfer force was evaluated to be larger for domain walls with steeper curvature. This will pave a path for the rapid spatiotemporal control of magnetic textures in insulating magnets.
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan; naoki.ogawa@riken.jp.
authors.forename: Naoki
authors.initials: N
authors.lastname: Ogawa
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan;
authors.forename: Wataru
authors.initials: W
authors.lastname: Koshibae
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan;
authors.forename: Aron Jonathan
authors.initials: AJ
authors.lastname: Beekman
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan; Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan;
authors.forename: Naoto
authors.initials: N
authors.lastname: Nagaosa
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan; Research and Development Headquarters, ROHM Company, Ltd., Kyoto 615-8585, Japan.
authors.forename: Masashi
authors.initials: M
authors.lastname: Kubota
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan; Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan;
authors.forename: Masashi
authors.initials: M
authors.lastname: Kawasaki
authors.affiliation: RIKEN Center for Emergent Matter Science, Wako, Saitama 351-0198, Japan; Department of Applied Physics and Quantum Phase Electronics Center, University of Tokyo, Tokyo 113-8656, Japan;
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Tokura
keywords: magnetic domain wall; photomagnetic effect; skyrmion; spin wave; spintronics