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Title: Topological Magnets: Functions Based on Berry Phase and Multipoles

Journal Article · · Annual Review of Condensed Matter Physics
 [1];  [2]
  1. University of Tokyo (Japan); University of Tokyo, Kashiwa (Japan); Johns Hopkins University, Baltimore, MD (United States)
  2. University of Tokyo (Japan); RIKEN, Saitama (Japan)

Macroscopic responses of magnets are often governed by magnetization and, thus, have been restricted to ferromagnets. However, such responses are strikingly large in the newly developed topological magnets, breaking the conventional scaling with magnetization. Taking the recently discovered antiferromagnetic (AF) Weyl semimetals as a prime example, we highlight the two central ingredients driving the significant macroscopic responses: the Berry curvature enhanced because of nontrivial band topology in momentum space, and the cluster magnetic multipoles in real space. The combination of large Berry curvature and multipoles enables large macroscopic responses such as the anomalous Hall and Nernst effects, the magneto-optical effect, and the novel magnetic spin Hall effect in antiferromagnets with negligible net magnetization, but also allows us to manipulate these effects by electrical means. Furthermore, nodal-point and nodal-line semimetallic states in ferromagnets may provide the strongly enhanced Berry curvature near the Fermi energy, leading to large responses beyond the conventional magnetization scaling. These significant properties and functions of the topological magnets lay the foundation for future technological development such as spintronics and thermoelectric technology.

Research Organization:
Johns Hopkins University, Baltimore, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Japan Science and Technology Agency (JST)
Grant/Contract Number:
SC0019331; JPMJCR18T3; JPMJMI20A1; 19H00650
OSTI ID:
1980844
Journal Information:
Annual Review of Condensed Matter Physics, Vol. 13, Issue 1; ISSN 1947-5454
Publisher:
Annual ReviewsCopyright Statement
Country of Publication:
United States
Language:
English

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