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Observation of Magnon Polarons in a Uniaxial Antiferromagnetic Insulator

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [4];  [4];  [3];  [2];  [4]
  1. Univ. of California, Riverside, CA (United States); OSTI
  2. Norwegian Univ. of Science and Technology, Trondheim (Norway)
  3. Univ. of California, Los Angeles, CA (United States)
  4. Univ. of California, Riverside, CA (United States)
+ Show Author Affiliations
Magnon polarons, a type of hybridized excitations between magnons and phonons, were first reported in yttrium iron garnet as anomalies in the spin Seebeck effect responses. Here, we report an observation of antiferromagnetic (AFM) magnon polarons in a uniaxial AFM insulator Cr2O3. Despite the relatively higher energy of magnon than that of the acoustic phonons, near the spin-flop transition of ~ 6 T , the left-handed magnon spectrum shifts downward to hybridize with the acoustic phonons to form AFM magnon polarons, which can also be probed by the spin Seebeck effect. The spin Seebeck signal is founded to be enhanced due to the magnon polarons at low temperatures.
Research Organization:
Univ. of California, Riverside, CA (United States); Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0012670
OSTI ID:
1851741
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 125; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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