Giant spin Seebeck effect through an interface organic semiconductor

Kalappattil, V.; Geng, R.; Das, R.; Pham, M.; Luong, H.; Nguyen, T.; Popescu, A.; Woods, L. M.; Kläui, M.; Srikanth, H.; Phan, M. H.

doi:10.1039/c9mh01498e

Title: Giant spin Seebeck effect through an interface organic semiconductor

Journal Article · Tue Feb 25 00:00:00 EST 2020 · Materials Horizons

DOI:https://doi.org/10.1039/c9mh01498e· OSTI ID:1800365

Kalappattil, V. ^[1]; Geng, R. ^[2]; Das, R. ^[1]; Pham, M. ^[2];

^[2]; Nguyen, T. ^[2];

^[1];

^[1]; Kläui, M. ^[3];

^[1];

^[1]

Univ. of South Florida, Tampa, FL (United States)
Univ. of Georgia, Athens, GA (United States)
Johannes Gutenberg Univ., Mainz (Germany)

Interfacing an organic semiconductor C₆₀ with a non-magnetic metallic thin film (Cu or Pt) has created a novel heterostructure that is ferromagnetic at ambient temperature, while its interface with a magnetic metal (Fe or Co) can tune the anisotropic magnetic surface property of the material. Here, we demonstrate that sandwiching C60 in between a magnetic insulator (Y₃Fe₅O₁₂:YIG) and a non-magnetic, strong spin–orbit metal (Pt) promotes highly efficient spin current transport via the thermally driven spin Seebeck effect (SSE). Experiments and first principles calculations consistently show that the presence of C₆₀ reduces significantly the conductivity mismatch between YIG and Pt and the surface perpendicular magnetic anisotropy of YIG, giving rise to enhanced spin mixing conductance across YIG/C₆₀/Pt interfaces. As a result, a 600% increase in the SSE voltage (V_LSSE) has been realized in YIG/C₆₀/Pt relative to YIG/Pt. Temperature-dependent SSE voltage measurements on YIG/C₆₀/Pt with varying C₆₀ layer thicknesses also show an exponential increase in V_LSSE at low temperatures below 200 K, resembling the temperature evolution of spin diffusion length of C₆₀. Our report emphasizes the important roles of the magnetic anisotropy and the spin diffusion length of the intermediate layer in the SSE in YIG/C₆₀/Pt structures, providing a new pathway for developing novel spin-caloric materials.

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Research Organization:: Univ. of South Florida, Tampa, FL (United States)

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

Grant/Contract Number:: FG02-06ER46297; FG02-07ER46438

OSTI ID:: 1800365

Alternate ID(s):: OSTI ID: 1603715

Journal Information:: Materials Horizons, Vol. 7, Issue 5; ISSN 2051-6347

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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