2015 Fiscal Year Final Research Report
Electrical control of magnon condensation
| Project/Area Number |
25706004
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Partial Multi-year Fund |
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| Research Field |
Nanostructural physics
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| Research Institution | Keio University |
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Principal Investigator |
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Keywords | マグノン / スピン波 / 量子凝縮 |
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| Outline of Final Research Achievements |
We studied the formation of Bose-Einstein condensation of magnons by electrical excitation methods to investigate the quantum coherence in magnon gases. In a ferromagnetic metals, we have succeeded in observing a clear spin wave waveform of backward volume wave (BVW) which is essential to realize the condensation. The increase of magnon density is quantitatively observed by utilizing magnon interference effect. While in a ferromagnetic insulator (yttrium iron garnet), we have detected Bose-Einstein condensate in the presence of temperature gradient. The Brillouin light scattering spectroscopy was successfully improved to harness wavevector- and time-resolutions.
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| Free Research Field |
マグノニクス
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