Thermal generation of spin current in epitaxial CoFe2O4 thin films

Guo, Er -Jia; Herklotz, Andreas; Kehlberger, Andreas; Cramer, Joel; Jakob, Gerhard; Klaeui, Mathias

doi:10.1063/1.4939625

Title: Thermal generation of spin current in epitaxial CoFe₂O₄ thin films

Journal Article · Tue Jan 12 00:00:00 EST 2016 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4939625· OSTI ID:1238752

Guo, Er -Jia ^[1]; Herklotz, Andreas ^[2]; Kehlberger, Andreas ^[3]; Cramer, Joel ^[3]; Jakob, Gerhard ^[3]; Klaeui, Mathias ^[3]

Johannes Gutenberg-Univ., Mainz (Germany); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Johannes Gutenberg-Univ., Mainz (Germany)

The longitudinal spin Seebeck effect (LSSE) has been investigated in high-quality epitaxial CoFe₂O₄ (CFO) thin films. The thermally excited spin currents in the CFO films are electrically detected in adjacent Pt layers due to the inverse spin Hall effect (ISHE). The LSSE signal exhibits a linear increase with increasing temperature gradient, yielding a LSSE coefficient of –100 nV/K at room temperature. The temperature dependence of the LSSE is investigated from room temperature down to 30 K, showing a significant reduction at low temperatures, revealing that the total amount of thermally generated magnons decreases. Moreover, we demonstrate that the spin Seebeck effect is an effective tool to study the magnetic anisotropy induced by epitaxial strain, especially in ultrathin films with low magnetic moments.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: German Research Foundation (DFG); European Union (EU); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1238752

Journal Information:: Applied Physics Letters, Vol. 108, Issue 2; ISSN 0003-6951

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

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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Fabrication and thickness-dependent magnetic studies of tunable multiferroic heterostructures (CFO/LSMO/LAO) Haque, Ariful; Mahbub, Ahmed R.; Abdullah-Al Mamun, Md Applied Physics A, Vol. 125, Issue 5 https://doi.org/10.1007/s00339-019-2620-y	journal	April 2019
Enhanced magnon spin transport in NiFe ₂ O ₄ thin films on a lattice-matched substrate Shan, J.; Singh, A. V.; Liang, L. Applied Physics Letters, Vol. 113, Issue 16 https://doi.org/10.1063/1.5049749	journal	October 2018
Simultaneous detection of the spin Hall magnetoresistance and Joule heating-induced spin Seebeck effect in Gd ₃ Fe ₅ O ₁₂ /Pt bilayers Fayaz, Muhammad Umer; Saleem, Muhammad Shahrukh; Gu, Youdi Journal of Applied Physics, Vol. 126, Issue 18 https://doi.org/10.1063/1.5117172	journal	November 2019
Interfacial ferromagnetism and atomic structures in high-temperature grown Fe ₃ O ₄ /Pt/Fe ₃ O ₄ epitaxial trilayers Kikkawa, T.; Suzuki, M.; Ramos, R. Journal of Applied Physics, Vol. 126, Issue 14 https://doi.org/10.1063/1.5125761	journal	October 2019
Pure spin currents in magnetically ordered insulator/normal metal heterostructures Althammer, Matthias Journal of Physics D: Applied Physics, Vol. 51, Issue 31 https://doi.org/10.1088/1361-6463/aaca89	journal	July 2018
Enhanced magnon spin transport in NiFe$_2$O$_4$ thin films on a lattice-matched substrate Shan, J.; Singh, A. V.; Liang, L. arXiv https://doi.org/10.48550/arxiv.1807.09013	text	January 2018

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