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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
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2023
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| Accesso online: | https://arxiv.org/abs/2308.07236 |
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| _version_ | 1866909104420683776 |
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| author | Chanda, Amit Holzmann, Christian Schulz, Noah Ullrich, Aladin Albrecht, Manfred Gross, Miela J. Ross, Caroline A. Arena, Dario. A. Phan, Manh-Huong Srikanth, Hariharan |
| author_facet | Chanda, Amit Holzmann, Christian Schulz, Noah Ullrich, Aladin Albrecht, Manfred Gross, Miela J. Ross, Caroline A. Arena, Dario. A. Phan, Manh-Huong Srikanth, Hariharan |
| contents | The magnon propagation length ($\langleξ\rangle$) of a ferro/ferrimagnet (FM) is one of the key factors that controls the generation and propagation of thermally-driven spin current in FM/heavy metal (HM) bilayer based spincaloritronic devices. Theory predicts that for the FM layer, $\langleξ\rangle$ is inversely proportional to the Gilbert damping ($α$) and the square root of the effective magnetic anisotropy constant ($K_{\rm eff}$). However, direct experimental evidence of this relationship is lacking. To experimentally confirm this prediction, we employ a combination of longitudinal spin Seebeck effect (LSSE), transverse susceptibility, and ferromagnetic resonance experiments to investigate the temperature evolution of $\langleξ\rangle$ and establish its correlation with the effective magnetic anisotropy field, $H_K^{\rm eff}$ ($\propto K_{\rm eff}$) and $α$ in Tm$_3$Fe$_5$O$_{12}$ (TmIG)/Pt bilayers. We observe concurrent drops in the LSSE voltage and $\langleξ\rangle$ below 200$^\circ$K in TmIG/Pt bilayers regardless of TmIG film thickness and substrate choice and attribute it to the noticeable increases in $H_K^{\rm eff}$ and $α$ that occur within the same temperature range. From the TmIG thickness dependence of the LSSE voltage, we determined the temperature dependence of $\langleξ\rangle$ and highlighted its correlation with the temperature-dependent $H_K^{\rm eff}$ and $α$ in TmIG/Pt bilayers, which will be beneficial for the development of rare-earth iron garnet-based efficient spincaloritronic nanodevices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_07236 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Temperature Evolution of Magnon Propagation Length in Tm$_3$Fe$_5$O$_{12}$ Thin Films: Roles of Magnetic Anisotropy and Gilbert Damping Chanda, Amit Holzmann, Christian Schulz, Noah Ullrich, Aladin Albrecht, Manfred Gross, Miela J. Ross, Caroline A. Arena, Dario. A. Phan, Manh-Huong Srikanth, Hariharan Materials Science The magnon propagation length ($\langleξ\rangle$) of a ferro/ferrimagnet (FM) is one of the key factors that controls the generation and propagation of thermally-driven spin current in FM/heavy metal (HM) bilayer based spincaloritronic devices. Theory predicts that for the FM layer, $\langleξ\rangle$ is inversely proportional to the Gilbert damping ($α$) and the square root of the effective magnetic anisotropy constant ($K_{\rm eff}$). However, direct experimental evidence of this relationship is lacking. To experimentally confirm this prediction, we employ a combination of longitudinal spin Seebeck effect (LSSE), transverse susceptibility, and ferromagnetic resonance experiments to investigate the temperature evolution of $\langleξ\rangle$ and establish its correlation with the effective magnetic anisotropy field, $H_K^{\rm eff}$ ($\propto K_{\rm eff}$) and $α$ in Tm$_3$Fe$_5$O$_{12}$ (TmIG)/Pt bilayers. We observe concurrent drops in the LSSE voltage and $\langleξ\rangle$ below 200$^\circ$K in TmIG/Pt bilayers regardless of TmIG film thickness and substrate choice and attribute it to the noticeable increases in $H_K^{\rm eff}$ and $α$ that occur within the same temperature range. From the TmIG thickness dependence of the LSSE voltage, we determined the temperature dependence of $\langleξ\rangle$ and highlighted its correlation with the temperature-dependent $H_K^{\rm eff}$ and $α$ in TmIG/Pt bilayers, which will be beneficial for the development of rare-earth iron garnet-based efficient spincaloritronic nanodevices. |
| title | Temperature Evolution of Magnon Propagation Length in Tm$_3$Fe$_5$O$_{12}$ Thin Films: Roles of Magnetic Anisotropy and Gilbert Damping |
| topic | Materials Science |
| url | https://arxiv.org/abs/2308.07236 |