title: Magnetic bubblecade memory based on chiral domain walls.
abstract: Unidirectional motion of magnetic domain walls is the key concept underlying next-generation domain-wall-mediated memory and logic devices. Such motion has been achieved either by injecting large electric currents into nanowires or by employing domain-wall tension induced by sophisticated structural modulation. Herein, we demonstrate a new scheme without any current injection or structural modulation. This scheme utilizes the recently discovered chiral domain walls, which exhibit asymmetry in their speed with respect to magnetic fields. Because of this asymmetry, an alternating magnetic field results in the coherent motion of the domain walls in one direction. Such coherent unidirectional motion is achieved even for an array of magnetic bubble domains, enabling the design of a new device prototype-magnetic bubblecade memory-with two-dimensional data-storage capability.
authors.affiliation: Center for Nanometrology, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors.forename: Kyoung-Woong
authors.initials: KW
authors.lastname: Moon
authors.affiliation: CSO and Department of Physics, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Duck-Ho
authors.initials: DH
authors.lastname: Kim
authors.affiliation: 1] CSO and Department of Physics, Seoul National University, Seoul 151-742, Republic of Korea [2] Spin Convergence Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea.
authors.forename: Sang-Cheol
authors.initials: SC
authors.lastname: Yoo
authors.affiliation: CSO and Department of Physics, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Soong-Geun
authors.initials: SG
authors.lastname: Je
authors.affiliation: Center for Nanometrology, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors.forename: Byong Sun
authors.initials: BS
authors.lastname: Chun
authors.affiliation: Center for Nanometrology, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors.forename: Wondong
authors.initials: W
authors.lastname: Kim
authors.affiliation: Spin Convergence Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea.
authors.forename: Byoung-Chul
authors.initials: BC
authors.lastname: Min
authors.affiliation: Center for Nanometrology, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors.forename: Chanyong
authors.initials: C
authors.lastname: Hwang
authors.affiliation: CSO and Department of Physics, Seoul National University, Seoul 151-742, Republic of Korea.
authors.forename: Sug-Bong
authors.initials: SB
authors.lastname: Choe