title: Skyrmion motion driven by oscillating magnetic field.
abstract: The one-dimensional magnetic skyrmion motion induced by an electric current has attracted much interest because of its application potential in next-generation magnetic memory devices. Recently, the unidirectional motion of large (20 μm in diameter) magnetic bubbles with two-dimensional skyrmion topology, driven by an oscillating magnetic field, has also been demonstrated. For application in high-density memory devices, it is preferable to reduce the size of skyrmion. Here we show by numerical simulation that a skyrmion of a few tens of nanometres can also be driven by high-frequency field oscillations, but with a different direction of motion from the in-plane component of the tilted oscillating field. We found that a high-frequency field for small skyrmions can excite skyrmion resonant modes and that a combination of different modes results in a final skyrmion motion with a helical trajectory. Because this helical motion depends on the frequency of the field, we can control both the speed and the direction of the skyrmion motion, which is a distinguishable characteristic compared with other methods.
authors: Center for Nanometrology, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors: Kyoung-Woong
authors: KW
authors: Moon
authors: CSO and Department of Physics, Seoul National University, Seoul 151-742, Republic of Korea.
authors: Duck-Ho
authors: DH
authors: Kim
authors: CSO and Department of Physics, Seoul National University, Seoul 151-742, Republic of Korea.
authors: Soong-Geun
authors: SG
authors: Je
authors: Center for Nanometrology, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors: Byong Sun
authors: BS
authors: Chun
authors: Center for Nanometrology, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors: Wondong
authors: W
authors: Kim
authors: Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
authors: Z Q
authors: ZQ
authors: Qiu
authors: CSO and Department of Physics, Seoul National University, Seoul 151-742, Republic of Korea.
authors: Sug-Bong
authors: SB
authors: Choe
authors: Center for Nanometrology, Korea Research Institute of Standards and Science, Daejeon 305-340, Republic of Korea.
authors: Chanyong
authors: C
authors: Hwang