Topological electromotive force from domain-wall dynamics in a ferromagnet

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.82.054410· OSTI ID:1000433

Yang, Shengyuan ^[1]; Beach, Geoffrey S. D. ^[1]; Knutson, Carl ^[1]; Xiao, Di ^[2]; Zhang, Zhenyu ^[2]; Tsoi, Maxin ^[1]; Niu, Qian ^[1]

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1. University of Texas, Austin
2. ORNL

We formulate a local gauge-invariant theory for the electromotive force induced by domain-wall dynamics in a ferromagnet. We demonstrate that this emf generation is a real-space topological pumping effect. The integral of the emf over one pumping period is a quantized topological invariant which does not depend on the details of the domain-wall configuration nor on its detailed dynamics. Based on our theory, the full instanta- neous electric potential distribution can be mapped out by standard electrostatic methods. We also provide further details on our recent experiments which confirmed the emf induced by domain-wall dynamics.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1000433
• Journal Information: Physical Review B, Vol. 82, Issue 5; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FERROMAGNETIC MATERIALS
ELECTRIC POTENTIAL
ELECTROMOTIVE FORCE
ELECTROSTATICS
MATHEMATICAL MODELS
DOMAIN STRUCTURE
TOPOLOGY