Spin Seebeck Effect in Iron Oxide Thin Films: Effects of Phase Transition, Phase Coexistence, And Surface Magnetism
Understanding the effects of phase transition, phase coexistence, and surface magnetism on the longitudinal spin Seebeck effect (LSSE) in a magnetic system is essential to manipulate the spin to charge current conversion efficiency for spincaloritronic applications. We aim to elucidate these effects...
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ACS Publications
2022
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| Truy cập trực tuyến: | https://pubs.acs.org/doi/10.1021/acsami.1c23284 https://dlib.phenikaa-uni.edu.vn/handle/PNK/5749 https://doi.org/10.1021/acsami.1c23284 |
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oai:localhost:PNK-57492022-08-17T05:54:52Z Spin Seebeck Effect in Iron Oxide Thin Films: Effects of Phase Transition, Phase Coexistence, And Surface Magnetism Amit, Chanda Derick, DeTellem Yen, Thi Hai Pham Iron oxide thin film Magnetism Understanding the effects of phase transition, phase coexistence, and surface magnetism on the longitudinal spin Seebeck effect (LSSE) in a magnetic system is essential to manipulate the spin to charge current conversion efficiency for spincaloritronic applications. We aim to elucidate these effects by performing a comprehensive study of the temperature dependence of the LSSE in biphase iron oxide (BPIO = α-Fe2O3 + Fe3O4) thin films grown on Si (100) and Al2O3 (111) substrates. A combination of a temperature-dependent anomalous Nernst effect (ANE) and electrical resistivity measurements show that the contribution of the ANE from the BPIO layer is negligible in comparison to the intrinsic LSSE in the Si/BPIO/Pt heterostructure, even at room temperature. Below the Verwey transition of the Fe3O4 phase, the total signal across BPIO/Pt is dominated by the LSSE. Noticeable changes in the intrinsic LSSE signal for both Si/BPIO/Pt and Al2O3/BPIO/Pt heterostructures around the Verwey transition of the Fe3O4 phase and the antiferromagnetic (AFM) Morin transition of the α-Fe2O3 phase are observed. The LSSE signal for Si/BPIO/Pt is found to be almost 2 times greater than that for Al2O3/BPIO/Pt; however, an opposite trend is observed for the saturation magnetization. Magnetic force microscopy reveals the higher density of surface magnetic moments of the Si/BPIO film in comparison to the Al2O3/BPIO film, which underscores the dominant role of interfacial magnetism on the LSSE signal and thereby explains the larger LSSE for Si/BPIO/Pt. 2022-05-05T07:26:17Z 2022-05-05T07:26:17Z 2022 Bài trích https://pubs.acs.org/doi/10.1021/acsami.1c23284 https://dlib.phenikaa-uni.edu.vn/handle/PNK/5749 https://doi.org/10.1021/acsami.1c23284 en ACS Publications |
| institution |
Trường Đại học Phenikaa |
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DSpace |
| language |
English |
| topic |
Iron oxide thin film Magnetism |
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Iron oxide thin film Magnetism Amit, Chanda Derick, DeTellem Yen, Thi Hai Pham Spin Seebeck Effect in Iron Oxide Thin Films: Effects of Phase Transition, Phase Coexistence, And Surface Magnetism |
| description |
Understanding the effects of phase transition, phase coexistence, and surface magnetism on the longitudinal spin Seebeck effect (LSSE) in a magnetic system is essential to manipulate the spin to charge current conversion efficiency for spincaloritronic applications. We aim to elucidate these effects by performing a comprehensive study of the temperature dependence of the LSSE in biphase iron oxide (BPIO = α-Fe2O3 + Fe3O4) thin films grown on Si (100) and Al2O3 (111) substrates. A combination of a temperature-dependent anomalous Nernst effect (ANE) and electrical resistivity measurements show that the contribution of the ANE from the BPIO layer is negligible in comparison to the intrinsic LSSE in the Si/BPIO/Pt heterostructure, even at room temperature. Below the Verwey transition of the Fe3O4 phase, the total signal across BPIO/Pt is dominated by the LSSE. Noticeable changes in the intrinsic LSSE signal for both Si/BPIO/Pt and Al2O3/BPIO/Pt heterostructures around the Verwey transition of the Fe3O4 phase and the antiferromagnetic (AFM) Morin transition of the α-Fe2O3 phase are observed. The LSSE signal for Si/BPIO/Pt is found to be almost 2 times greater than that for Al2O3/BPIO/Pt; however, an opposite trend is observed for the saturation magnetization. Magnetic force microscopy reveals the higher density of surface magnetic moments of the Si/BPIO film in comparison to the Al2O3/BPIO film, which underscores the dominant role of interfacial magnetism on the LSSE signal and thereby explains the larger LSSE for Si/BPIO/Pt. |
| format |
Bài trích |
| author |
Amit, Chanda Derick, DeTellem Yen, Thi Hai Pham |
| author_facet |
Amit, Chanda Derick, DeTellem Yen, Thi Hai Pham |
| author_sort |
Amit, Chanda |
| title |
Spin Seebeck Effect in Iron Oxide Thin Films: Effects of Phase Transition, Phase Coexistence, And Surface Magnetism |
| title_short |
Spin Seebeck Effect in Iron Oxide Thin Films: Effects of Phase Transition, Phase Coexistence, And Surface Magnetism |
| title_full |
Spin Seebeck Effect in Iron Oxide Thin Films: Effects of Phase Transition, Phase Coexistence, And Surface Magnetism |
| title_fullStr |
Spin Seebeck Effect in Iron Oxide Thin Films: Effects of Phase Transition, Phase Coexistence, And Surface Magnetism |
| title_full_unstemmed |
Spin Seebeck Effect in Iron Oxide Thin Films: Effects of Phase Transition, Phase Coexistence, And Surface Magnetism |
| title_sort |
spin seebeck effect in iron oxide thin films: effects of phase transition, phase coexistence, and surface magnetism |
| publisher |
ACS Publications |
| publishDate |
2022 |
| url |
https://pubs.acs.org/doi/10.1021/acsami.1c23284 https://dlib.phenikaa-uni.edu.vn/handle/PNK/5749 https://doi.org/10.1021/acsami.1c23284 |
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AT amitchanda spinseebeckeffectinironoxidethinfilmseffectsofphasetransitionphasecoexistenceandsurfacemagnetism AT derickdetellem spinseebeckeffectinironoxidethinfilmseffectsofphasetransitionphasecoexistenceandsurfacemagnetism AT yenthihaipham spinseebeckeffectinironoxidethinfilmseffectsofphasetransitionphasecoexistenceandsurfacemagnetism |
| _version_ |
1787740858212155392 |