title: Fast Magnetic Domain-Wall Motion in a Ring-Shaped Nanowire Driven by a Voltage.
abstract: Magnetic domain-wall motion driven by a voltage dissipates much less heat than by a current, but none of the existing reports have achieved speeds exceeding 100 m/s. Here phase-field and finite-element simulations were combined to study the dynamics of strain-mediated voltage-driven magnetic domain-wall motion in curved nanowires. Using a ring-shaped, rough-edged magnetic nanowire on top of a piezoelectric disk, we demonstrate a fast voltage-driven magnetic domain-wall motion with average velocity up to 550 m/s, which is comparable to current-driven wall velocity. An analytical theory is derived to describe the strain dependence of average magnetic domain-wall velocity. Moreover, one 180° domain-wall cycle around the ring dissipates an ultrasmall amount of heat, as small as 0.2 fJ, approximately 3 orders of magnitude smaller than those in current-driven cases. These findings suggest a new route toward developing high-speed, low-power-dissipation domain-wall spintronics.
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Jia-Mian
authors.initials: JM
authors.lastname: Hu
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Tiannan
authors.initials: T
authors.lastname: Yang
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Kasra
authors.initials: K
authors.lastname: Momeni
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Xiaoxing
authors.initials: X
authors.lastname: Cheng
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Lei
authors.initials: L
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Shiming
authors.initials: S
authors.lastname: Lei
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Shujun
authors.initials: S
authors.lastname: Zhang
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Susan
authors.initials: S
authors.lastname: Trolier-McKinstry
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Venkatraman
authors.initials: V
authors.lastname: Gopalan
authors.affiliation: Department of Mechanical and Aerospace Engineering, University of California , Los Angeles, California 90095, United States.
authors.forename: Gregory P
authors.initials: GP
authors.lastname: Carman
authors.affiliation: School of Materials Science and Engineering, and State Key Lab of New Ceramics and Fine Processing, Tsinghua University , Beijing 100084, China.
authors.forename: Ce-Wen
authors.initials: CW
authors.lastname: Nan
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Long-Qing
authors.initials: LQ
authors.lastname: Chen
keywords: Magnetic domain-walls; fast motion; low-power spintronics; phase-field modeling; piezoelectrics