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Title: All-in-all-out magnetic domain size in pyrochlore iridate thin films as probed by local magnetotransport

Pyrochlore iridates have attracted growing attention because of a theoretical prediction of a possible topological semimetal phase originating from all-in-all-out spin ordering. Related to the topological band structure, recent findings of the magnetic domain wall conduction have stimulated investigations of magnetic domain distribution in this system. Here, we investigate the size of magnetic domains in Eu{sub 2}Ir{sub 2}O{sub 7} single crystalline thin films by magnetoresistance (MR) using microscale Hall bars. Two distinct magnetic domains of the all-in-all-out spin structure are known to exhibit linear MR but with opposite signs, which enables us to estimate the ratio of the two domains in the patterned channel. The linear MR for 80 × 60 μm{sup 2} channel is nearly zero after zero-field cooling, suggesting random distribution of domains smaller than the channel size. In contrast, the wide distribution of the value of the linear MR is detected in 2 × 2 μm{sup 2} channel, reflecting the detectable domain size depending on each cooling-cycle. Compared to simulation results, we estimate the average size of a single all-in-all-out magnetic domain as 1–2 μm.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [1] ;  [5]
  1. Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656 (Japan)
  2. Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
  3. (JST), Tokyo 102-0075 (Japan)
  4. Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561 (Japan)
  5. (CEMS), Wako 351-0198 (Japan)
Publication Date:
OSTI Identifier:
22489289
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 2; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DOMAIN STRUCTURE; MAGNETORESISTANCE; MONOCRYSTALS; PYROCHLORE; RANDOMNESS; SIMULATION; SPIN; THIN FILMS; TOPOLOGY