Enhancement in Thermally Generated Spin Voltage at the Interfaces between Pd and NiFe2O4 Films Grown on Lattice-Matched Substrates

Rastogi A, Li Z, Singh AV, Regmi S, Peters T, Bougiatioti P, Carsten né Meier D, Mohammadi JB, Khodadadi B, Mewes T, Mishra R, et al. (2020)
Physical Review Applied 14(1): 014014.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Rastogi, A.; Li, Z.; Singh, A.V.; Regmi, S.; Peters, TobiasUniBi; Bougiatioti, PanagiotaUniBi; Carsten né Meier, D.; Mohammadi, J.B.; Khodadadi, B.; Mewes, T.; Mishra, R.; Gazquez, J.
Alle
Abstract / Bemerkung
Efficient spin injection from epitaxial ferrimagnetic NiFe2O4 thin films into a Pd layer is demonstrated via spin Seebeck effect measurements in the longitudinal geometry. The NiFe2O4 films (60 nm to 1 μm) are grown by pulsed-laser deposition on isostructural spinel MgAl2O4, MgGa2O4, and CoGa2O4 substrates with lattice mismatch varying between 3.2 and 0.2%. For the thinner films (≤ 330 nm), an increase in the spin Seebeck voltage is observed with decreasing lattice mismatch, which correlates well with a decrease in the Gilbert damping parameter as determined from ferromagnetic resonance measurements. High resolution transmission electron microscopy studies indicate substantial decrease of antiphase boundary and interface defects that cause strain relaxation, i.e.,misfit dislocations, in the films with decreasing lattice mismatch. This highlights the importance of reducing structural defects in spinel ferrites for efficient spin injection. It is further shown that angle-dependent spin Seebeck effect measurements provide a qualitative method to probe for in-plane magnetic anisotropies present in the films.
Erscheinungsjahr
2020
Zeitschriftentitel
Physical Review Applied
Band
14
Ausgabe
1
Art.-Nr.
014014
eISSN
2331-7019
Page URI
https://pub.uni-bielefeld.de/record/2944581

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Rastogi A, Li Z, Singh AV, et al. Enhancement in Thermally Generated Spin Voltage at the Interfaces between Pd and NiFe2O4 Films Grown on Lattice-Matched Substrates. Physical Review Applied. 2020;14(1): 014014.
Rastogi, A., Li, Z., Singh, A. V., Regmi, S., Peters, T., Bougiatioti, P., Carsten né Meier, D., et al. (2020). Enhancement in Thermally Generated Spin Voltage at the Interfaces between Pd and NiFe2O4 Films Grown on Lattice-Matched Substrates. Physical Review Applied, 14(1), 014014. doi:10.1103/physrevapplied.14.014014
Rastogi, A., Li, Z., Singh, A. V., Regmi, S., Peters, T., Bougiatioti, P., Carsten né Meier, D., Mohammadi, J. B., Khodadadi, B., Mewes, T., et al. (2020). Enhancement in Thermally Generated Spin Voltage at the Interfaces between Pd and NiFe2O4 Films Grown on Lattice-Matched Substrates. Physical Review Applied 14:014014.
Rastogi, A., et al., 2020. Enhancement in Thermally Generated Spin Voltage at the Interfaces between Pd and NiFe2O4 Films Grown on Lattice-Matched Substrates. Physical Review Applied, 14(1): 014014.
A. Rastogi, et al., “Enhancement in Thermally Generated Spin Voltage at the Interfaces between Pd and NiFe2O4 Films Grown on Lattice-Matched Substrates”, Physical Review Applied, vol. 14, 2020, : 014014.
Rastogi, A., Li, Z., Singh, A.V., Regmi, S., Peters, T., Bougiatioti, P., Carsten né Meier, D., Mohammadi, J.B., Khodadadi, B., Mewes, T., Mishra, R., Gazquez, J., Borisevich, A.Y., Galazka, Z., Uecker, R., Reiss, G., Kuschel, T., Gupta, A.: Enhancement in Thermally Generated Spin Voltage at the Interfaces between Pd and NiFe2O4 Films Grown on Lattice-Matched Substrates. Physical Review Applied. 14, : 014014 (2020).
Rastogi, A., Li, Z., Singh, A.V., Regmi, S., Peters, Tobias, Bougiatioti, Panagiota, Carsten né Meier, D., Mohammadi, J.B., Khodadadi, B., Mewes, T., Mishra, R., Gazquez, J., Borisevich, A.Y., Galazka, Z., Uecker, R., Reiss, Günter, Kuschel, Timo, and Gupta, A. “Enhancement in Thermally Generated Spin Voltage at the Interfaces between Pd and NiFe2O4 Films Grown on Lattice-Matched Substrates”. Physical Review Applied 14.1 (2020): 014014.
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