Spin Seebeck effect in W-type and Z-type hexagonal ferrite thin films

0566268 - ÚACH 2023 RIV US eng J - Journal Article
Soroka, Miroslav - Pashchenko, M. - Prokleška, J. - Buršík, Josef - Knížek, K.
Spin Seebeck effect in W-type and Z-type hexagonal ferrite thin films.
Journal of Applied Physics. Roč. 132, č. 24 (2022), č. článku 245101. ISSN 0021-8979. E-ISSN 1089-7550
R&D Projects: GA ČR(CZ) GA19-06433S
Institutional support: RVO:61388980
Keywords : spin Seebeck effect * hexagonal ferrite * thin film
OECD category: Inorganic and nuclear chemistry
Impact factor: 3.2, year: 2022
Method of publishing: Limited access
https://doi.org/10.1063/5.0124632

The spin Seebeck effect was studied in thin films of hexagonal ferrites of W-type SrCo2-xZnxFe16O27 with x = 0, 1, and 2 and Z-type with the composition Sr3Co2Fe24O41. The present data were compared with the previously obtained data on Y-type Ba2Zn2-xCoxFe12O22 with x = 0 and 2. Our work showed that the SSE signal can also be generated in materials with complicated crystal and magnetic structures. Hexaferrites with the magnetic easy plane were selected except for uniaxial W-type with x = 2, for which the highest saturated SSE 0.144 μV/K was observed, however, magnetic field above 1 T must be applied to achieve saturation. For low field application, hexaferrites with easy magnetization in ab-plane are more suitable, namely, Y-type with x = 2 or W-type with x = 1. SSE is suppressed in Co-substituted hexaferrites due to the random distribution of Co among various sites. Therefore, the Co cations interfere with the long-range magnetic ordering and diminish the spin-wave propagation. Additional suppression of SSE might be invoked by the higher magnetic anisotropy of the Co-substituted hexaferrites, which opens a gap in the magnon spectrum and, thus, reduces the contribution of lower energy magnons with longer diffusion length.
Permanent Link: https://hdl.handle.net/11104/0337655