Nonadiabatic Berry phase in nanocrystalline magnets

Journal Article · Tue Dec 20 00:00:00 EST 2016 · AIP Advances

DOI:https://doi.org/10.1063/1.4972804· OSTI ID:1336845

Skomski, R. ^[1]; Sellmyer, D. J. ^[1]

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1. Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA

In this study, it is investigated how a Berry phase is created in polycrystalline nanomagnets and how the phase translates into an emergent magnetic field and into a topological Hall-effect contribution. The analysis starts directly from the spin of the conduction electrons and does not involve any adiabatic Hamiltonian. Completely random spin alignment in the nanocrystallites does not lead to a nonzero emergent field, but a modulation of the local magnetization does. As an explicit example, we consider a wire with a modulated cone angle.

• Research Organization: Univ. of Nebraska, Lincoln, NE (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: FG02-04ER46152
• OSTI ID: 1336845
• Alternate ID(s): OSTI ID: 1393509; OSTI ID: 1421281
• Journal Information: AIP Advances, Journal Name: AIP Advances Vol. 7 Journal Issue: 5; ISSN 2158-3226
• Publisher: American Institute of Physics
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Geometric phases
Magnetic fields
Crystal structure
Magnets
Skyrmions