2013 Fiscal Year Final Research Report
Detection and manipulation of spin current using superconductors
| Project/Area Number |
24740217
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Condensed matter physics II
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | スピントロニクス / スピン流 / スピンホール効果 / 弱反局在 / メソスコピック系 / 強磁性体 / 超伝導体 |
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| Research Abstract |
The spin Hall effect, which enables to convert charge current into spin current or vice versa, has been widely utilized in the field of spintronics. One of the important tasks in this field is to enhance the spin Hall angle that is the conversion rate between charge and spin currents. In this work, we have studied the spin Hall effect of Bi-doped copper by means of the spin absorption method and found that the spin Hall angle of CuBi alloys is 10 times larger than that of Pt, which is the standard spin Hall material. In order to estimate the spin diffusion length of nonmagnetic materials, we have developed a new method, i.e., weak antilocalization and found that the estimated spin diffusion length from weak antilocalization is quantitatively consistent with that from the spin absorption method. We have also studied the spin transport of superconducting Nb. It has turned out that the spin relaxation time of superconducting Nb is enhanced by a factor of 4, compared to that of normal Nb.
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