Magnetic field driven domain-wall propagation in magnetic nanowires

Journal Article · Sat Aug 15 00:00:00 EDT 2009 · Annals of Physics (New York)

DOI:https://doi.org/10.1016/j.aop.2009.05.004· OSTI ID:21308077

Wang, X R ^[1]; Lu, J; He, C ^[1]

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1. Physics Department, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong (China)

The mechanism of magnetic field induced magnetic domain-wall (DW) propagation in a nanowire is revealed: A static DW cannot exist in a homogeneous magnetic nanowire when an external magnetic field is applied. Thus, a DW must vary with time under a static magnetic field. A moving DW must dissipate energy due to the Gilbert damping. As a result, the wire has to release its Zeeman energy through the DW propagation along the field direction. The DW propagation speed is proportional to the energy dissipation rate that is determined by the DW structure. The negative differential mobility in the intermediate field is due to the transition from high energy dissipation at low field to low energy dissipation at high field. For the field larger than the so-called Walker breakdown field, DW plane precesses around the wire, leading to the propagation speed oscillation.

• OSTI ID: 21308077
• Journal Information: Annals of Physics (New York), Vol. 324, Issue 8; Other Information: DOI: 10.1016/j.aop.2009.05.004; PII: S0003-4916(09)00101-8; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-4916
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
CARRIER MOBILITY
ENERGY LOSSES
MAGNETIC FIELDS
QUANTUM WIRES
ZEEMAN EFFECT