Origin of transverse voltages generated by thermal gradients and electric fields in ferrimagnetic-insulator/heavy-metal bilayers

Bose, Arnab; Jain, Rakshit; Bauer, Jackson J.; Buhrman, Robert A.; Ross, Caroline A.; Ralph, Daniel C.

doi:10.1103/physrevb.105.l100408

Title: Origin of transverse voltages generated by thermal gradients and electric fields in ferrimagnetic-insulator/heavy-metal bilayers

Journal Article · Mon Mar 28 00:00:00 EDT 2022 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.105.l100408· OSTI ID:1883558

^[1]; Jain, Rakshit ^[1];

^[2]; Buhrman, Robert A. ^[1]; Ross, Caroline A. ^[2]; Ralph, Daniel C. ^[3]

Cornell Univ., Ithaca, NY (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Cornell Univ., Ithaca, NY (United States); Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY (United States)

We compare thermal-gradient-driven transverse voltages in ferrimagnetic-insulator/heavy-metal bilayers (Tm₃Fe₅O₁₂/W and Tm₃Fe₅O₁₂/Pt) to corresponding electrically driven transverse resistances at and above room temperature. We find for Tm₃Fe₅O₁₂/W that the thermal and electrical effects can be explained by a common spin-current detection mechanism, the physics underlying spin Hall magnetoresistance (SMR). However, for Tm₃Fe₅O₁₂/Pt the ratio of the electrically driven transverse voltages (planar Hall signal/anomalous Hall signal) is much larger than the ratio of corresponding thermal-gradient signals, a result which is very different from expectations for a SMR-based mechanism alone. Here, we ascribe this difference to a proximity-induced magnetic layer at the Tm₃Fe₅O₁₂/Pt interface.

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Research Organization:: Cornell Univ., Ithaca, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Experimental Condensed Matter Physics; National Science Foundation (NSF)

Grant/Contract Number:: SC0017671

OSTI ID:: 1883558

Journal Information:: Physical Review. B, Vol. 105, Issue 10; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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