Spin Seebeck Effect from Antiferromagnetic Magnons and Critical Spin Fluctuations in Epitaxial FeF2 Films

Li, Junxue; Shi, Zhong; Ortiz, Victor H.; Aldosary, Mohammed; Chen, Cliff; Aji, Vivek; Wei, Peng; Shi, Jing

doi:10.1103/physrevlett.122.217204

Title: Spin Seebeck Effect from Antiferromagnetic Magnons and Critical Spin Fluctuations in Epitaxial FeF₂ Films

Journal Article · 31 May 2019 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.122.217204 · OSTI ID:1611920

Li, Junxue ^[1]; Shi, Zhong ^[2]; Ortiz, Victor H. ^[1]; Aldosary, Mohammed ^[3]; Chen, Cliff ^[1]; Aji, Vivek ^[1]; Wei, Peng ^[1]; Shi, Jing ^[1]

Univ. of California, Riverside, CA (United States)
Tongji Univ., Shanghai (China)
Univ. of California, Riverside, CA (United States); King Saud Univ., Riyadh (Saudi Arabia)

We report a longitudinal spin Seebeck effect (SSE) study in epitaxially grown FeF₂(110) antiferromagnetic (AFM) thin films with strong uniaxial anisotropy over the temperature range of 3.8–250 K. Both the magnetic-field and temperature-dependent SSE signals below the Néel temperature (T_N = 70 K) of the FeF₂ films are consistent with a theoretical model based on the excitations of AFM magnons without any net induced static magnetic moment. In addition to the characteristic low-temperature SSE peak associated with the AFM magnons, there is another SSE peak at T_N which extends well into the paramagnetic phase. All the SSE data taken at different magnetic fields up to 12 T near and above the critical point T_N follow the critical scaling law very well with the critical exponents for magnetic susceptibility of 3D Ising systems, which suggests that the AFM spin correlation is responsible for the observed SSE near T_N.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Spins and Heat in Nanoscale Electronic Systems (SHINES); Univ. of California, Riverside, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012670

OSTI ID:: 1611920

Alternate ID(s):: OSTI ID: 1523688

Journal Information:: Physical Review Letters, Vol. 122, Issue 21; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 30 works

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Title: Spin Seebeck Effect from Antiferromagnetic Magnons and Critical Spin Fluctuations in Epitaxial FeF₂ Films