Spin Seebeck effect in insulating SrFeO3–δ films

Hong, Deshun; Liu, Changjiang; Pearson, John E.; Hoffmann, Axel; Fong, Dillon D.; Bhattacharya, Anand

doi:10.1063/1.5097422

Title: Spin Seebeck effect in insulating SrFeO_3–δ films

Journal Article · 19 June 2019 · Applied Physics Letters

DOI: https://doi.org/10.1063/1.5097422 · OSTI ID:1543280

Hong, Deshun ^[1]; Liu, Changjiang ^[1]; Pearson, John E. ^[1];

^[1];

^[1]

Argonne National Lab. (ANL), Argonne, IL (United States)

In SrFeO_3–δ, noncollinear antiferromagnetic spin textures have led to the observation of the topological Hall effect and may give rise to novel magnetic excitations. Here, we measured the spin Seebeck effect in epitaxial, oxygen reduced SrFeO_3–δ films, which are nonferromagnetic and insulating at low temperatures. Here, we detected a spin Seebeck signal below 300K and the signal is enhanced below approximate to 100K, near the ordering temperature of incommensurate antiferromagnetism found in bulk single crystals of SrFeO_3–δ. The spin Seebeck signal increases in magnitude and develops a nonlinear dependence on the magnetic field at lower temperatures. Control experiments were used to verify that the measured signal arises from a spin current and to rule out magnetic proximity effects. Our work shows a detectable spin Seebeck signal in nonferromagnetic insulator SrFeO_3–δ.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1543280

Alternate ID(s):: OSTI ID: 1527047

Journal Information:: Applied Physics Letters, Vol. 114, Issue 24; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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