Journal
NANO LETTERS
Volume 16, Issue 4, Pages 2341-2348Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b05046
Keywords
Magnetic domain-walls; fast motion; piezoelectrics; low-power spintronics; phase-field modeling
Categories
Funding
- National Science Foundation (NSF) [DMR-1235092, DMR-1410714]
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [FG02-07ER46417]
- NSF-MRSEC Center for Nanoscale Science [DMR-1420620]
- National Science Foundation, of the Center for Dielectrics and Piezoelectrics [IIP-1361571]
- National Science Foundation [EEC 1160504, NSF 11-537]
- NSF of China [51332001, 11234005]
- Tsinghua University [2014z01006]
- NSF Major Research Instrumentation Program [OCI-0821527]
- Materials Simulation Center
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1235092] Funding Source: National Science Foundation
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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.
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